{"id":6776,"date":"2026-08-01T11:00:43","date_gmt":"2026-08-01T07:30:43","guid":{"rendered":"https:\/\/parmin.cloud\/blog\/?p=6776"},"modified":"2026-08-01T11:00:43","modified_gmt":"2026-08-01T07:30:43","slug":"%d8%a2%d9%85%d9%88%d8%b2%d8%b4-%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-event-emitter%d9%87%d8%a7-%d8%af%d8%b1-node-js","status":"publish","type":"post","link":"https:\/\/parmin.cloud\/blog\/%d8%a2%d9%85%d9%88%d8%b2%d8%b4-%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-event-emitter%d9%87%d8%a7-%d8%af%d8%b1-node-js\/","title":{"rendered":"\u0622\u0645\u0648\u0632\u0634 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 Event Emitter\u200c\u0647\u0627 \u062f\u0631 Node.js"},"content":{"rendered":"

\u0645\u0642\u062f\u0645\u0647<\/strong> \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 (Events) \u062f\u0631 Node.js \u062a\u0648\u0633\u0637 \u0622\u0628\u062c\u06a9\u062a\u200c\u0647\u0627\u06cc\u06cc \u0628\u0647 \u0646\u0627\u0645 Event Emitter (\u0633\u0627\u0637\u0639\u200c\u06a9\u0646\u0646\u062f\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f) \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u0634\u0648\u0646\u062f \u06a9\u0647 \u0628\u0627 \u0627\u0631\u0633\u0627\u0644 \u06cc\u06a9 \u067e\u06cc\u0627\u0645\u060c \u0648\u0642\u0648\u0639 \u06cc\u06a9 \u0639\u0645\u0644\u06cc\u0627\u062a \u0631\u0627 \u0639\u0644\u0627\u0645\u062a\u200c\u06af\u0630\u0627\u0631\u06cc \u0645\u06cc\u200c\u06a9\u0646\u0646\u062f. \u062a\u0648\u0633\u0639\u0647\u200c\u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u062c\u0627\u0648\u0627\u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u06a9\u062f\u06cc \u0628\u0646\u0648\u06cc\u0633\u0646\u062f \u06a9\u0647 \u0628\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u06cc\u06a9 Event Emitter \u06af\u0648\u0634 \u0645\u06cc\u200c\u062f\u0647\u062f (Listen)\u060c \u06a9\u0647 \u0627\u06cc\u0646 \u0628\u0647 \u0622\u0646\u200c\u0647\u0627 \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc\u200c\u062f\u0647\u062f \u0647\u0631 \u0628\u0627\u0631 \u0627\u06cc\u0646 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0631\u062e \u062f\u0627\u062f\u0646\u062f\u060c \u062a\u0648\u0627\u0628\u0639 \u062e\u0627\u0635\u06cc \u0631\u0627 \u0627\u062c\u0631\u0627 \u06a9\u0646\u0646\u062f. \u062f\u0631 \u0627\u06cc\u0646 \u0632\u0645\u06cc\u0646\u0647\u060c \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0627\u0632 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0634\u0646\u0627\u0633\u0627\u06cc\u06cc\u200c\u06a9\u0646\u0646\u062f\u0647 (Identifying String) \u0648 \u0647\u0631 \u062f\u0627\u062f\u0647\u200c\u0627\u06cc \u06a9\u0647 \u0628\u0627\u06cc\u062f \u0628\u0647 \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646 (Listeners) \u0627\u0631\u0633\u0627\u0644 \u0634\u0648\u062f\u060c \u062a\u0634\u06a9\u06cc\u0644 \u0645\u06cc\u200c\u0634\u0648\u0646\u062f.<\/p>\n

<\/div>\n

\u0645\u0639\u0645\u0648\u0644\u0627\u064b \u062f\u0631 Node.js\u060c \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0645\u06cc\u200c\u062e\u0648\u0627\u0647\u06cc\u0645 \u0639\u0645\u0644\u06cc \u067e\u0633 \u0627\u0632 \u062a\u06a9\u0645\u06cc\u0644 \u0639\u0645\u0644\u06cc \u062f\u06cc\u06af\u0631 \u0627\u0646\u062c\u0627\u0645 \u0634\u0648\u062f\u060c \u0627\u0632 \u062a\u06a9\u0646\u06cc\u06a9\u200c\u0647\u0627\u06cc \u0628\u0631\u0646\u0627\u0645\u0647\u200c\u0646\u0648\u06cc\u0633\u06cc \u0646\u0627\u0647\u0645\u06af\u0627\u0645 (Asynchronous) \u0645\u0627\u0646\u0646\u062f \u062a\u0648\u0627\u0628\u0639 Callback \u062a\u0648 \u062f\u0631 \u062a\u0648 \u06cc\u0627 \u0632\u0646\u062c\u06cc\u0631\u0647\u200c\u0627\u06cc \u06a9\u0631\u062f\u0646 Promise\u200c\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645. \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u0627\u06cc\u0646 \u062a\u06a9\u0646\u06cc\u06a9\u200c\u0647\u0627 \u0639\u0645\u0644\u06cc\u0627\u062a \u0631\u0627\u0647\u200c\u0627\u0646\u062f\u0627\u0632 \u0648 \u0639\u0645\u0644\u06cc\u0627\u062a \u0646\u0647\u0627\u06cc\u06cc \u0631\u0627 \u0628\u0647 \u0634\u062f\u062a \u0628\u0647 \u0647\u0645 \u0645\u062a\u0635\u0644 (Couple) \u0645\u06cc\u200c\u06a9\u0646\u0646\u062f\u060c \u06a9\u0647 \u0627\u0635\u0644\u0627\u062d \u0639\u0645\u0644\u06cc\u0627\u062a \u0646\u0647\u0627\u06cc\u06cc \u0631\u0627 \u062f\u0631 \u0622\u06cc\u0646\u062f\u0647 \u062f\u0634\u0648\u0627\u0631 \u0645\u06cc\u200c\u0633\u0627\u0632\u062f. Event Emitter\u200c\u0647\u0627 \u0631\u0627\u0647 \u0645\u062a\u0641\u0627\u0648\u062a\u06cc \u0628\u0631\u0627\u06cc \u0633\u0627\u062e\u062a\u0627\u0631\u0628\u0646\u062f\u06cc \u0627\u06cc\u0646 \u0631\u0627\u0628\u0637\u0647 \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc\u200c\u062f\u0647\u0646\u062f: \u0627\u0644\u06af\u0648\u06cc \u0627\u0646\u062a\u0634\u0627\u0631-\u0627\u0634\u062a\u0631\u0627\u06a9 (Publish-Subscribe). \u062f\u0631 \u0627\u06cc\u0646 \u0627\u0644\u06af\u0648\u06cc \u0645\u0639\u0645\u0627\u0631\u06cc \u0646\u0631\u0645\u200c\u0627\u0641\u0632\u0627\u0631\u060c \u06cc\u06a9 \u0646\u0627\u0634\u0631 (Publisher – \u0647\u0645\u0627\u0646 Event Emitter) \u067e\u06cc\u0627\u0645\u06cc (\u0631\u0648\u06cc\u062f\u0627\u062f\u06cc) \u0631\u0627 \u0627\u0631\u0633\u0627\u0644 \u0645\u06cc\u200c\u06a9\u0646\u062f \u0648 \u06cc\u06a9 \u0645\u0634\u062a\u0631\u06a9 (Subscriber) \u0631\u0648\u06cc\u062f\u0627\u062f \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u06a9\u0631\u062f\u0647 \u0648 \u0639\u0645\u0644\u06cc \u0631\u0627 \u0627\u0646\u062c\u0627\u0645 \u0645\u06cc\u200c\u062f\u0647\u062f. \u0642\u062f\u0631\u062a \u0627\u06cc\u0646 \u0627\u0644\u06af\u0648 \u062f\u0631 \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 \u0646\u0627\u0634\u062f \u0646\u06cc\u0627\u0632\u06cc \u0646\u062f\u0627\u0631\u062f \u0627\u0632 \u0645\u0634\u062a\u0631\u06a9\u200c\u0647\u0627 \u0627\u0637\u0644\u0627\u0639 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f. \u0646\u0627\u0634\u0631 \u067e\u06cc\u0627\u0645 \u0631\u0627 \u0645\u0646\u062a\u0634\u0631 \u0645\u06cc\u200c\u06a9\u0646\u062f \u0648 \u0648\u0627\u06a9\u0646\u0634 \u0628\u0647 \u0622\u0646 \u0628\u0647 \u0639\u0647\u062f\u0647 \u0645\u0634\u062a\u0631\u06a9\u200c\u0647\u0627\u0633\u062a. \u0627\u06af\u0631 \u0628\u062e\u0648\u0627\u0647\u06cc\u0645 \u0631\u0641\u062a\u0627\u0631 \u0627\u067e\u0644\u06cc\u06a9\u06cc\u0634\u0646 \u062e\u0648\u062f \u0631\u0627 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0647\u06cc\u0645\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u0645 \u0646\u062d\u0648\u0647 \u0648\u0627\u06a9\u0646\u0634 \u0645\u0634\u062a\u0631\u06a9\u200c\u0647\u0627 \u0631\u0627 \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u062a\u063a\u06cc\u06cc\u0631 \u0646\u0627\u0634\u062f \u062a\u0646\u0638\u06cc\u0645 \u06a9\u0646\u06cc\u0645.<\/p>\n

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\u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647\u060c \u0645\u0627 \u06cc\u06a9 Event Listener (\u0634\u0646\u0648\u0646\u062f\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f) \u0628\u0631\u0627\u06cc \u06cc\u06a9 \u06a9\u0644\u0627\u0633 \u062c\u0627\u0648\u0627\u0627\u0633\u06a9\u0631\u06cc\u067e\u062a\u06cc \u0628\u0647 \u0646\u0627\u0645 TicketManager<\/code> \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u0628\u0647 \u06a9\u0627\u0631\u0628\u0631 \u0627\u062c\u0627\u0632\u0647 \u062e\u0631\u06cc\u062f \u0628\u0644\u06cc\u0637 \u0645\u06cc\u200c\u062f\u0647\u062f. \u0645\u0627 \u0634\u0646\u0648\u0646\u062f\u0647\u200c\u0647\u0627\u06cc\u06cc \u0628\u0631\u0627\u06cc \u0631\u0648\u06cc\u062f\u0627\u062f buy<\/code> \u062a\u0646\u0638\u06cc\u0645 \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f \u06a9\u0647 \u0647\u0631 \u0628\u0627\u0631 \u06cc\u06a9 \u0628\u0644\u06cc\u0637 \u062e\u0631\u06cc\u062f\u0627\u0631\u06cc \u0645\u06cc\u200c\u0634\u0648\u062f\u060c \u0641\u0639\u0627\u0644 \u0645\u06cc\u200c\u0634\u0648\u0646\u062f. \u0627\u06cc\u0646 \u0641\u0631\u0622\u06cc\u0646\u062f \u0647\u0645\u0686\u0646\u06cc\u0646 \u0646\u062d\u0648\u0647 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u062e\u0637\u0627 \u0627\u0632 \u0633\u0645\u062a Emitter \u0648 \u0646\u062d\u0648\u0647 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0645\u0634\u062a\u0631\u06a9\u200c\u0647\u0627\u06cc \u0631\u0648\u06cc\u062f\u0627\u062f \u0631\u0627 \u0646\u06cc\u0632 \u0646\u0634\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u062f.<\/p>\n

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\u067e\u06cc\u0634\u200c\u0646\u06cc\u0627\u0632\u0647\u0627<\/strong><\/p>\n

    \n
  • Node.js \u0631\u0648\u06cc \u0645\u0627\u0634\u06cc\u0646 \u062a\u0648\u0633\u0639\u0647 \u0634\u0645\u0627 \u0646\u0635\u0628 \u0628\u0627\u0634\u062f. \u0627\u06cc\u0646 \u0622\u0645\u0648\u0632\u0634 \u0628\u0627 Node.js \u0646\u0633\u062e\u0647 20 \u062a\u0633\u062a \u0634\u062f\u0647 \u0627\u0633\u062a. \u0628\u0631\u0627\u06cc \u0646\u0635\u0628 \u0622\u0646 \u0631\u0648\u06cc \u0627\u0648\u0628\u0648\u0646\u062a\u0648 24.04\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u062f \u0628\u0647 \u0645\u0633\u062a\u0646\u062f\u0627\u062a \u0631\u0633\u0645\u06cc \u067e\u0627\u0631\u0645\u06cc\u0646 \u06a9\u0644\u0648\u062f (Parmin Cloud) \u0645\u0631\u0627\u062c\u0639\u0647 \u06a9\u0646\u06cc\u062f.<\/li>\n
  • \u0622\u0634\u0646\u0627\u06cc\u06cc \u0628\u0627 \u06a9\u0644\u0627\u0633\u200c\u0647\u0627\u06cc \u062c\u0627\u0648\u0627\u0627\u0633\u06a9\u0631\u06cc\u067e\u062a (ES6).<\/li>\n<\/ul>\n
    <\/div>\n
    \n

    \u0645\u0631\u062d\u0644\u0647 \u06f1 \u2014 \u0633\u0627\u0637\u0639 \u06a9\u0631\u062f\u0646 (Emitting) \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627<\/h3>\n

    \u062f\u0631 \u0627\u06cc\u0646 \u0645\u0631\u062d\u0644\u0647\u060c \u062f\u0648 \u0631\u0648\u0634 \u0631\u0627\u06cc\u062c \u0628\u0631\u0627\u06cc \u0627\u06cc\u062c\u0627\u062f \u06cc\u06a9 Event Emitter \u062f\u0631 Node.js \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645. \u0627\u0648\u0644\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u0633\u062a\u0642\u06cc\u0645 \u0627\u0632 \u0622\u0628\u062c\u06a9\u062a Event Emitter \u0627\u0633\u062a \u0648 \u062f\u0648\u0645\u06cc \u0627\u06cc\u062c\u0627\u062f \u0622\u0628\u062c\u06a9\u062a\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0627\u0632 Event Emitter \u0627\u0631\u062b\u200c\u0628\u0631\u06cc (Extend) \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/p>\n

    <\/div>\n

    \u062a\u0635\u0645\u06cc\u0645\u200c\u06af\u06cc\u0631\u06cc \u0628\u0631\u0627\u06cc \u0627\u0646\u062a\u062e\u0627\u0628 \u06cc\u06a9\u06cc \u0627\u0632 \u0627\u06cc\u0646 \u062f\u0648 \u0631\u0648\u0634 \u0628\u0633\u062a\u06af\u06cc \u0628\u0647 \u0645\u06cc\u0632\u0627\u0646 \u0627\u062a\u0635\u0627\u0644 (Coupling) \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u0634\u0645\u0627 \u0628\u0647 \u0639\u0645\u0644\u06cc\u0627\u062a \u0622\u0628\u062c\u06a9\u062a\u200c\u0647\u0627\u06cc\u062a\u0627\u0646 \u062f\u0627\u0631\u062f. \u0627\u06af\u0631 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc\u06cc \u06a9\u0647 \u0645\u06cc\u200c\u062e\u0648\u0627\u0647\u06cc\u062f \u0633\u0627\u0637\u0639 \u06a9\u0646\u06cc\u062f \u0646\u062a\u06cc\u062c\u0647 \u0627\u0639\u0645\u0627\u0644 \u06cc\u06a9 \u0622\u0628\u062c\u06a9\u062a \u0647\u0633\u062a\u0646\u062f\u060c \u0627\u062d\u062a\u0645\u0627\u0644\u0627\u064b \u0628\u0647\u062a\u0631 \u0627\u0633\u062a \u0627\u0632 \u06a9\u0644\u0627\u0633 Event Emitter \u0627\u0631\u062b\u200c\u0628\u0631\u06cc \u06a9\u0646\u06cc\u062f \u062a\u0627 \u0628\u0631\u0627\u06cc \u0631\u0627\u062d\u062a\u06cc \u06a9\u0627\u0631 \u0628\u0647 \u062a\u0648\u0627\u0628\u0639 \u0622\u0646 \u062f\u0633\u062a\u0631\u0633\u06cc \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f. \u0627\u06af\u0631 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0645\u0633\u062a\u0642\u0644 \u0627\u0632 \u0622\u0628\u062c\u06a9\u062a\u200c\u0647\u0627\u06cc \u06a9\u0633\u0628\u200c\u0648\u06a9\u0627\u0631 \u0634\u0645\u0627 \u0647\u0633\u062a\u0646\u062f\u060c \u06cc\u06a9 \u0622\u0628\u062c\u06a9\u062a \u0645\u0633\u062a\u0642\u0644 Event Emitter \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u06cc\u062f \u06a9\u0647 \u062a\u0648\u0633\u0637 \u0622\u0628\u062c\u06a9\u062a\u200c\u0647\u0627\u06cc \u0634\u0645\u0627 \u0627\u0631\u062c\u0627\u0639 \u062f\u0627\u062f\u0647 \u0645\u06cc\u200c\u0634\u0648\u062f.<\/p>\n

    <\/div>\n

    \u0627\u0628\u062a\u062f\u0627 \u06cc\u06a9 \u067e\u0648\u0634\u0647 \u0628\u0631\u0627\u06cc \u0630\u062e\u06cc\u0631\u0647 \u06a9\u062f\u0647\u0627\u06cc \u062e\u0648\u062f \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f. \u062f\u0631 \u062a\u0631\u0645\u06cc\u0646\u0627\u0644 \u062e\u0648\u062f\u060c \u06cc\u06a9 \u067e\u0648\u0634\u0647 \u062c\u062f\u06cc\u062f \u0628\u0647 \u0646\u0627\u0645 event-emitters<\/code> \u0628\u0633\u0627\u0632\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    mkdir event-emitters<\/div>\n
    cd event-emitters<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0627\u0648\u0644\u06cc\u0646 \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0628\u0627 \u0646\u0627\u0645 firstEventEmitter.js<\/code> \u062f\u0631 \u0648\u06cc\u0631\u0627\u06cc\u0634\u06af\u0631 \u0645\u062a\u0646 \u0628\u0627\u0632 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    nano firstEventEmitter.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062f\u0631 Node.js\u060c \u0645\u0627 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0631\u0627 \u0627\u0632 \u0637\u0631\u06cc\u0642 \u06a9\u0644\u0627\u0633 EventEmitter<\/code> \u0633\u0627\u0637\u0639 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645. \u0627\u06cc\u0646 \u06a9\u0644\u0627\u0633 \u0628\u062e\u0634\u06cc \u0627\u0632 \u0645\u0627\u0698\u0648\u0644 events<\/code> \u0627\u0633\u062a. \u0627\u0628\u062a\u062f\u0627 \u0627\u06cc\u0646 \u0645\u0627\u0698\u0648\u0644 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const { EventEmitter } = require(“events”);<\/div>\n
    <\/div>\n
    const firstEmitter = new EventEmitter();<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062d\u0627\u0644\u0627 \u0628\u0627 \u0627\u0636\u0627\u0641\u0647 \u06a9\u0631\u062f\u0646 \u062e\u0637 \u0632\u06cc\u0631\u060c \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f \u0631\u0627 \u0633\u0627\u0637\u0639 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    firstEmitter.emit(“My first event”);<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062a\u0627\u0628\u0639 emit()<\/code> \u0628\u0631\u0627\u06cc \u0634\u0644\u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc\u200c\u0634\u0648\u062f. \u0645\u0627 \u0628\u0627\u06cc\u062f \u0646\u0627\u0645 \u0631\u0648\u06cc\u062f\u0627\u062f \u0631\u0627 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u0631\u0634\u062a\u0647 \u0628\u0647 \u0622\u0646 \u067e\u0627\u0633 \u062f\u0647\u06cc\u0645. \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u0645 \u0647\u0631 \u062a\u0639\u062f\u0627\u062f \u0622\u0631\u06af\u0648\u0645\u0627\u0646 \u0631\u0627 \u0628\u0639\u062f \u0627\u0632 \u0646\u0627\u0645 \u0631\u0648\u06cc\u062f\u0627\u062f \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u06cc\u0645. \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc\u06cc \u06a9\u0647 \u0641\u0642\u0637 \u0646\u0627\u0645 \u062f\u0627\u0631\u0646\u062f \u0645\u062d\u062f\u0648\u062f \u0647\u0633\u062a\u0646\u062f\u061b \u0622\u0631\u06af\u0648\u0645\u0627\u0646\u200c\u0647\u0627\u06cc \u062f\u06cc\u06af\u0631 \u0628\u0647 \u0645\u0627 \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc\u200c\u062f\u0647\u0646\u062f \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc\u06cc \u0631\u0627 \u0628\u0647 \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646 \u0628\u0641\u0631\u0633\u062a\u06cc\u0645.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0630\u062e\u06cc\u0631\u0647 \u06a9\u0631\u062f\u0647 \u0648 \u0628\u0627 \u062f\u0633\u062a\u0648\u0631 node<\/code> \u0622\u0646 \u0631\u0627 \u0627\u062c\u0631\u0627 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    node firstEventEmitter.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0627\u062c\u0631\u0627\u06cc \u062e\u0648\u062f \u0631\u0627 \u062a\u0645\u0627\u0645 \u0645\u06cc\u200c\u06a9\u0646\u062f\u060c \u0647\u06cc\u0686 \u062e\u0631\u0648\u062c\u06cc \u062f\u0631 \u062a\u0631\u0645\u06cc\u0646\u0627\u0644 \u0646\u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u06cc\u062f. \u0632\u06cc\u0631\u0627 \u0645\u0627 \u0647\u06cc\u0686 \u067e\u06cc\u0627\u0645\u06cc \u0631\u0627 \u0644\u0627\u06af \u0646\u06a9\u0631\u062f\u06cc\u0645 \u0648 \u0686\u06cc\u0632\u06cc \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0631\u062f \u06a9\u0647 \u0628\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f \u0627\u0631\u0633\u0627\u0644 \u0634\u062f\u0647 \u06af\u0648\u0634 \u062f\u0647\u062f. \u0631\u0648\u06cc\u062f\u0627\u062f \u0633\u0627\u0637\u0639 \u0634\u062f\u0647 \u0627\u0633\u062a\u060c \u0627\u0645\u0627 \u0647\u06cc\u0686 \u0686\u06cc\u0632 \u0628\u0647 \u0622\u0646 \u0648\u0627\u06a9\u0646\u0634 \u0646\u0634\u0627\u0646 \u0646\u0645\u06cc\u200c\u062f\u0647\u062f.<\/p>\n

    <\/div>\n

    \u062d\u0627\u0644\u0627 \u0628\u06cc\u0627\u06cc\u06cc\u062f \u06cc\u06a9 \u0645\u062b\u0627\u0644 \u06a9\u0627\u0645\u0644\u200c\u062a\u0631 \u0627\u0632 \u0627\u0646\u062a\u0634\u0627\u0631\u060c \u0634\u0646\u0648\u062f \u0648 \u0648\u0627\u06a9\u0646\u0634 \u0628\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0628\u0633\u0627\u0632\u06cc\u0645. \u0645\u0627 \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0631\u0627 \u0628\u0627 \u0627\u06cc\u062c\u0627\u062f \u06cc\u06a9 \u0627\u067e\u0644\u06cc\u06a9\u06cc\u0634\u0646 \u0646\u0645\u0648\u0646\u0647 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0628\u0644\u06cc\u0637 \u0627\u0646\u062c\u0627\u0645 \u0645\u06cc\u200c\u062f\u0647\u06cc\u0645. \u0645\u062f\u06cc\u0631\u06cc\u062a \u0628\u0644\u06cc\u0637 \u062a\u0627\u0628\u0639\u06cc \u0628\u0631\u0627\u06cc \u062e\u0631\u06cc\u062f \u0628\u0644\u06cc\u0637 \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc\u200c\u062f\u0647\u062f. \u0648\u0642\u062a\u06cc \u0628\u0644\u06cc\u0637\u06cc \u062e\u0631\u06cc\u062f\u0627\u0631\u06cc \u0645\u06cc\u200c\u0634\u0648\u062f\u060c \u0631\u0648\u06cc\u062f\u0627\u062f\u06cc \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 \u062c\u0632\u0626\u06cc\u0627\u062a \u062e\u0631\u06cc\u062f\u0627\u0631 \u0627\u0631\u0633\u0627\u0644 \u0645\u06cc\u200c\u0634\u0648\u062f.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 \u062c\u062f\u06cc\u062f\u06cc \u0628\u0647 \u0646\u0627\u0645 ticketManager.js<\/code> \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    nano ticketManager.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0645\u0627\u0646\u0646\u062f \u0645\u062b\u0627\u0644 \u0642\u0628\u0644\u060c \u0628\u0627\u06cc\u062f \u06a9\u0644\u0627\u0633 EventEmitter<\/code> \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u0645:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const EventEmitter = require(“events”);<\/div>\n
    <\/div>\n
    class TicketManager extends EventEmitter {}<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062f\u0631 \u0627\u06cc\u0646\u062c\u0627\u060c \u06a9\u0644\u0627\u0633 TicketManager<\/code> \u0627\u0632 \u06a9\u0644\u0627\u0633 EventEmitter<\/code> \u0627\u0631\u062b\u200c\u0628\u0631\u06cc \u0645\u06cc\u200c\u06a9\u0646\u062f. \u0627\u06cc\u0646 \u06cc\u0639\u0646\u06cc \u06a9\u0644\u0627\u0633 TicketManager<\/code> \u0645\u062a\u062f\u0647\u0627 \u0648 \u0648\u06cc\u0698\u06af\u06cc\u200c\u0647\u0627\u06cc EventEmitter<\/code> \u0631\u0627 \u0628\u0647 \u0627\u0631\u062b \u0645\u06cc\u200c\u0628\u0631\u062f \u0648 \u0628\u0647 \u0645\u062a\u062f emit()<\/code> \u062f\u0633\u062a\u0631\u0633\u06cc \u067e\u06cc\u062f\u0627 \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/p>\n

    <\/div>\n

    \u0645\u0627 \u0645\u06cc\u200c\u062e\u0648\u0627\u0647\u06cc\u0645 \u062a\u0639\u062f\u0627\u062f \u0628\u0644\u06cc\u0637\u200c\u0647\u0627\u06cc \u0627\u0648\u0644\u06cc\u0647 \u0631\u0627 \u062f\u0631 \u0633\u0627\u0632\u0646\u062f\u0647 (Constructor) \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u0645:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const EventEmitter = require(“events”);<\/div>\n
    <\/div>\n
    class TicketManager extends EventEmitter {<\/div>\n
    constructor(supply) {<\/div>\n
    super();<\/div>\n
    this.supply = supply;<\/div>\n
    }<\/div>\n
    }<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0633\u0627\u0632\u0646\u062f\u0647 \u06cc\u06a9 \u0622\u0631\u06af\u0648\u0645\u0627\u0646 supply<\/code> (\u0645\u0648\u062c\u0648\u062f\u06cc) \u062f\u0627\u0631\u062f. \u062d\u062a\u06cc \u0627\u06af\u0631 \u0627\u0639\u0644\u0627\u0645 \u06a9\u0631\u062f\u06cc\u0645 TicketManager<\/code> \u06cc\u06a9 \u06a9\u0644\u0627\u0633 \u0641\u0631\u0632\u0646\u062f EventEmitter<\/code> \u0627\u0633\u062a\u060c \u0647\u0646\u0648\u0632 \u0628\u0627\u06cc\u062f super()<\/code> \u0631\u0627 \u0641\u0631\u0627\u062e\u0648\u0627\u0646\u06cc \u06a9\u0646\u06cc\u0645 \u062a\u0627 \u0628\u0647 \u0645\u062a\u062f\u0647\u0627 \u0648 \u0648\u06cc\u0698\u06af\u06cc\u200c\u0647\u0627\u06cc EventEmitter<\/code> \u062f\u0633\u062a\u0631\u0633\u06cc \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u0645.<\/p>\n

    <\/div>\n

    \u062d\u0627\u0644\u0627 \u0645\u062a\u062f buy()<\/code> \u0631\u0627 \u0627\u0636\u0627\u0641\u0647 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const EventEmitter = require(“events”);<\/div>\n
    <\/div>\n
    class TicketManager extends EventEmitter {<\/div>\n
    constructor(supply) {<\/div>\n
    super();<\/div>\n
    this.supply = supply;<\/div>\n
    }<\/div>\n
    <\/div>\n
    buy(email, price) {<\/div>\n
    this.supply–;<\/div>\n
    this.emit(“buy”, email, price, Date.now());<\/div>\n
    }<\/div>\n
    }<\/div>\n
    <\/div>\n
    module.exports = TicketManager<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062f\u0631 \u0645\u062a\u062f buy()<\/code>\u060c \u0627\u06cc\u0645\u06cc\u0644 \u062e\u0631\u06cc\u062f\u0627\u0631 \u0648 \u0642\u06cc\u0645\u062a \u0628\u0644\u06cc\u0637 \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645\u060c \u0645\u0648\u062c\u0648\u062f\u06cc \u0631\u0627 \u06cc\u06a9\u06cc \u06a9\u0645 \u06a9\u0631\u062f\u0647 \u0648 \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f buy<\/code> \u0631\u0627 \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc \u0627\u0636\u0627\u0641\u06cc (\u0627\u06cc\u0645\u06cc\u0644\u060c \u0642\u06cc\u0645\u062a \u0648 \u062a\u0627\u06cc\u0645\u200c\u0627\u0633\u062a\u0645\u067e) \u0633\u0627\u0637\u0639 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645. \u062f\u0631 \u0646\u0647\u0627\u06cc\u062a \u06a9\u0644\u0627\u0633 \u0631\u0627 \u0627\u06a9\u0633\u067e\u0648\u0631\u062a (Export) \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645. \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0630\u062e\u06cc\u0631\u0647 \u06a9\u0631\u062f\u0647 \u0648 \u0628\u0628\u0646\u062f\u06cc\u062f.<\/p>\n

    <\/div>\n
    \n

    \u0645\u0631\u062d\u0644\u0647 \u06f2 \u2014 \u06af\u0648\u0634 \u062f\u0627\u062f\u0646 \u0628\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627<\/h3>\n

    Node.js \u0628\u0647 \u0645\u0627 \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc\u200c\u062f\u0647\u062f \u0628\u0627 \u062a\u0627\u0628\u0639 on()<\/code> \u06cc\u06a9 \u0634\u0646\u0648\u0646\u062f\u0647 \u0628\u0631\u0627\u06cc \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u06cc\u0645. \u0627\u06cc\u0646 \u0645\u062a\u062f \u0628\u0647 \u0646\u0627\u0645 \u0631\u0648\u06cc\u062f\u0627\u062f \u062e\u0627\u0635\u06cc \u06af\u0648\u0634 \u0645\u06cc\u200c\u062f\u0647\u062f \u0648 \u067e\u0633 \u0627\u0632 \u0631\u062e \u062f\u0627\u062f\u0646 \u0631\u0648\u06cc\u062f\u0627\u062f\u060c \u06cc\u06a9 \u062a\u0627\u0628\u0639 Callback \u0631\u0627 \u0627\u062c\u0631\u0627 \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 \u062c\u062f\u06cc\u062f\u06cc \u0628\u0647 \u0646\u0627\u0645 firstListener.js<\/code> \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    nano firstListener.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0627\u0628\u062a\u062f\u0627 TicketManager<\/code> \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const TicketManager = require(“.\/ticketManager”);<\/div>\n
    <\/div>\n
    const ticketManager = new TicketManager(10);<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062d\u0627\u0644\u0627 \u0627\u0648\u0644\u06cc\u0646 \u0634\u0646\u0648\u0646\u062f\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f \u062e\u0648\u062f \u0631\u0627 \u0628\u0631\u0627\u06cc \u0631\u0648\u06cc\u062f\u0627\u062f buy<\/code> \u0627\u0636\u0627\u0641\u0647 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const TicketManager = require(“.\/ticketManager”);<\/div>\n
    <\/div>\n
    const ticketManager = new TicketManager(10);<\/div>\n
    <\/div>\n
    ticketManager.on(“buy”, () => {<\/div>\n
    console.log(“Someone bought a ticket!”);<\/div>\n
    });<\/div>\n
    <\/div>\n
    ticketManager.buy(“test@email.com”, 20);<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0628\u0631\u0627\u06cc \u0627\u0636\u0627\u0641\u0647 \u06a9\u0631\u062f\u0646 \u0634\u0646\u0648\u0646\u062f\u0647 \u062c\u062f\u06cc\u062f\u060c \u0627\u0632 \u062a\u0627\u0628\u0639 on()<\/code> \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f\u06cc\u0645. \u0622\u0631\u06af\u0648\u0645\u0627\u0646 \u062f\u0648\u0645 \u0622\u0646 \u06cc\u06a9 \u062a\u0627\u0628\u0639 Arrow (\u062a\u0627\u0628\u0639 Callback) \u0627\u0633\u062a \u06a9\u0647 \u067e\u0633 \u0627\u0632 \u0633\u0627\u0637\u0639 \u0634\u062f\u0646 \u0631\u0648\u06cc\u062f\u0627\u062f \u0627\u062c\u0631\u0627 \u0645\u06cc\u200c\u0634\u0648\u062f. \u0633\u067e\u0633 \u0628\u0627 \u0641\u0631\u0627\u062e\u0648\u0627\u0646\u06cc buy()<\/code> \u0631\u0648\u06cc\u062f\u0627\u062f \u0631\u0627 \u0634\u0644\u06cc\u06a9 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0630\u062e\u06cc\u0631\u0647 \u0648 \u0627\u062c\u0631\u0627 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    node firstListener.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062e\u0631\u0648\u062c\u06cc \u062f\u0631 \u06a9\u0646\u0633\u0648\u0644 \u0634\u0645\u0627 \u0627\u06cc\u0646 \u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f:<\/p>\n

    <\/div>\n
    \n
    text<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    Output<\/div>\n
    Someone bought a ticket!<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0627\u06af\u0631 \u0645\u062a\u062f buy()<\/code> \u0631\u0627 \u062f\u0648\u0628\u0627\u0631 \u0635\u062f\u0627 \u0628\u0632\u0646\u06cc\u062f\u060c \u067e\u06cc\u0627\u0645 \u062f\u0648 \u0628\u0627\u0631 \u0686\u0627\u067e \u0645\u06cc\u200c\u0634\u0648\u062f\u060c \u0632\u06cc\u0631\u0627 \u0634\u0646\u0648\u0646\u062f\u0647 \u0647\u0631 \u062f\u0648 \u0631\u0648\u06cc\u062f\u0627\u062f \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/p>\n

    <\/div>\n

    \u06af\u0627\u0647\u06cc \u0627\u0648\u0642\u0627\u062a \u0645\u0627 \u0641\u0642\u0637 \u0628\u0647 \u0627\u0648\u0644\u06cc\u0646 \u0628\u0627\u0631\u06cc \u06a9\u0647 \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f \u0631\u062e \u0645\u06cc\u200c\u062f\u0647\u062f \u0639\u0644\u0627\u0642\u0647\u200c\u0645\u0646\u062f\u06cc\u0645. Node.js \u0628\u0631\u0627\u06cc \u0627\u06cc\u0646 \u0645\u0648\u0631\u062f \u062a\u0627\u0628\u0639 once()<\/code> \u0631\u0627 \u0627\u0631\u0627\u0626\u0647 \u06a9\u0631\u062f\u0647 \u0627\u0633\u062a. \u0648\u0642\u062a\u06cc \u0631\u0648\u06cc\u062f\u0627\u062f\u06cc \u062a\u0648\u0633\u0637 \u0634\u0646\u0648\u0646\u062f\u0647\u200c\u0627\u06cc \u06a9\u0647 \u0628\u0627 once()<\/code> \u062b\u0628\u062a \u0634\u062f\u0647 \u062f\u0631\u06cc\u0627\u0641\u062a \u0645\u06cc\u200c\u0634\u0648\u062f\u060c Node.js \u0628\u0647 \u0637\u0648\u0631 \u062e\u0648\u062f\u06a9\u0627\u0631 \u0622\u0646 \u0634\u0646\u0648\u0646\u062f\u0647 \u0631\u0627 \u062d\u0630\u0641 \u06a9\u0631\u062f\u0647 \u0648 \u0633\u067e\u0633 \u06a9\u062f \u0631\u0627 \u0627\u062c\u0631\u0627 \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/p>\n

    <\/div>\n
    \n

    \u0645\u0631\u062d\u0644\u0647 \u06f3 \u2014 \u062f\u0631\u06cc\u0627\u0641\u062a \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc \u0631\u0648\u06cc\u062f\u0627\u062f<\/h3>\n

    \u062a\u0627 \u0627\u06cc\u0646\u062c\u0627 \u0634\u0646\u0648\u0646\u062f\u0647\u200c\u0647\u0627\u06cc\u06cc \u062a\u0646\u0638\u06cc\u0645 \u06a9\u0631\u062f\u06cc\u062f \u06a9\u0647 \u0628\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u0633\u0627\u0637\u0639 \u0634\u062f\u0647 \u0648\u0627\u06a9\u0646\u0634 \u0646\u0634\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u0646\u062f. \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u0633\u0627\u0637\u0639 \u0634\u062f\u0647 \u0647\u0645\u0686\u0646\u06cc\u0646 \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc\u06cc \u0631\u0627 \u0647\u0645\u0631\u0627\u0647 \u062e\u0648\u062f \u062f\u0627\u0631\u0646\u062f. \u0628\u06cc\u0627\u06cc\u06cc\u062f \u0628\u0628\u06cc\u0646\u06cc\u0645 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u06cc\u0646 \u062f\u0627\u062f\u0647\u200c\u0647\u0627 \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u06a9\u0646\u06cc\u0645.<\/p>\n

    <\/div>\n

    \u0645\u0627 \u0686\u0646\u062f \u0645\u0627\u0698\u0648\u0644 \u062c\u062f\u06cc\u062f Node.js \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645: \u06cc\u06a9 \u0633\u0631\u0648\u06cc\u0633 \u0627\u06cc\u0645\u06cc\u0644 \u0648 \u06cc\u06a9 \u0633\u0631\u0648\u06cc\u0633 \u062f\u06cc\u062a\u0627\u0628\u06cc\u0633.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 emailService.js<\/code> \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    nano emailService.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    class EmailService {<\/div>\n
    send(email) {<\/div>\n
    console.log(`Sending email to ${email}`);<\/div>\n
    }<\/div>\n
    }<\/div>\n
    <\/div>\n
    module.exports = EmailService<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0633\u067e\u0633 \u0641\u0627\u06cc\u0644 databaseService.js<\/code> \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    nano databaseService.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    class DatabaseService {<\/div>\n
    save(email, price, timestamp) {<\/div>\n
    console.log(`Running query: INSERT INTO orders VALUES (email, price, created) VALUES (${email}, ${price}, ${timestamp})`);<\/div>\n
    }<\/div>\n
    }<\/div>\n
    <\/div>\n
    module.exports = DatabaseService<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062d\u0627\u0644\u0627 \u0641\u0627\u06cc\u0644 index.js<\/code> \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f \u062a\u0627 \u0627\u06cc\u0646 \u0645\u0627\u0698\u0648\u0644\u200c\u0647\u0627 \u0631\u0627 \u0628\u0647 \u0647\u0645 \u0645\u062a\u0635\u0644 \u06a9\u0646\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    nano index.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0645\u0627\u0698\u0648\u0644\u200c\u0647\u0627 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0631\u062f\u0647 \u0648 \u0622\u0628\u062c\u06a9\u062a\u200c\u0647\u0627 \u0631\u0627 \u0646\u0645\u0648\u0646\u0647\u200c\u0633\u0627\u0632\u06cc (Instantiate) \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const TicketManager = require(“.\/ticketManager”);<\/div>\n
    const EmailService = require(“.\/emailService”);<\/div>\n
    const DatabaseService = require(“.\/databaseService”);<\/div>\n
    <\/div>\n
    const ticketManager = new TicketManager(3);<\/div>\n
    const emailService = new EmailService();<\/div>\n
    const databaseService = new DatabaseService();<\/div>\n
    <\/div>\n
    ticketManager.on(“buy”, (email, price, timestamp) => {<\/div>\n
    emailService.send(email);<\/div>\n
    databaseService.save(email, price, timestamp);<\/div>\n
    });<\/div>\n
    <\/div>\n
    ticketManager.buy(“test@email.com”, 10);<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062f\u0631 \u0627\u06cc\u0646 \u06a9\u062f\u060c \u062a\u0627\u0628\u0639 Callback \u0645\u0627 \u0633\u0647 \u0622\u0631\u06af\u0648\u0645\u0627\u0646 \u062f\u0627\u0631\u062f \u06a9\u0647 \u0628\u0627 \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc \u0633\u0627\u0637\u0639 \u0634\u062f\u0647 \u0627\u0632 \u0637\u0631\u0641 emit()<\/code> \u0645\u0637\u0627\u0628\u0642\u062a \u062f\u0627\u0631\u062f.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0630\u062e\u06cc\u0631\u0647 \u0648 \u0627\u062c\u0631\u0627 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    node index.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062e\u0631\u0648\u062c\u06cc \u0632\u06cc\u0631 \u0631\u0627 \u0645\u0634\u0627\u0647\u062f\u0647 \u062e\u0648\u0627\u0647\u06cc\u062f \u06a9\u0631\u062f:<\/p>\n

    <\/div>\n
    \n
    text<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    Output<\/div>\n
    Sending email to test@email.com<\/div>\n
    Running query: INSERT INTO orders VALUES (email, price, created) VALUES (test@email.com, 10, 1588720081832)<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062f\u0627\u062f\u0647\u200c\u0647\u0627 \u0628\u0627 \u0645\u0648\u0641\u0642\u06cc\u062a \u062f\u0631\u06cc\u0627\u0641\u062a \u0634\u062f\u0647 \u0648 \u062f\u0631 \u062a\u0648\u0627\u0628\u0639 \u0645\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0634\u062f\u0646\u062f.<\/p>\n

    <\/div>\n
    \n

    \u0645\u0631\u062d\u0644\u0647 \u06f4 \u2014 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u062e\u0637\u0627<\/h3>\n

    \u0627\u06af\u0631 \u06cc\u06a9 Event Emitter \u0646\u062a\u0648\u0627\u0646\u062f \u0639\u0645\u0644\u06cc\u0627\u062a \u062e\u0648\u062f \u0631\u0627 \u0627\u0646\u062c\u0627\u0645 \u062f\u0647\u062f\u060c \u0628\u0627\u06cc\u062f \u0631\u0648\u06cc\u062f\u0627\u062f\u06cc \u0631\u0627 \u0628\u0631\u0627\u06cc \u0639\u0644\u0627\u0645\u062a\u200c\u06af\u0630\u0627\u0631\u06cc \u0634\u06a9\u0633\u062a \u0639\u0645\u0644\u06cc\u0627\u062a \u0633\u0627\u0637\u0639 \u06a9\u0646\u062f. \u062f\u0631 Node.js\u060c \u0631\u0648\u0634 \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f \u0628\u0631\u0627\u06cc \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0633\u0627\u0637\u0639 \u06a9\u0631\u062f\u0646 \u0631\u0648\u06cc\u062f\u0627\u062f error<\/code> \u0627\u0633\u062a. \u0627\u06cc\u0646 \u0631\u0648\u06cc\u062f\u0627\u062f \u0628\u0627\u06cc\u062f \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 \u06cc\u06a9 \u0622\u0628\u062c\u06a9\u062a Error<\/code> \u0628\u0627\u0634\u062f.<\/p>\n

    <\/div>\n

    \u062f\u0631 \u062d\u0627\u0644 \u062d\u0627\u0636\u0631\u060c \u0645\u062f\u06cc\u0631\u06cc\u062a \u0628\u0644\u06cc\u0637 \u0645\u0627 \u0628\u0627 \u0647\u0631 \u0628\u0627\u0631 \u062e\u0631\u06cc\u062f\u060c \u0645\u0648\u062c\u0648\u062f\u06cc \u0631\u0627 \u06cc\u06a9\u06cc \u06a9\u0627\u0647\u0634 \u0645\u06cc\u200c\u062f\u0647\u062f\u060c \u0627\u0645\u0627 \u0686\u06cc\u0632\u06cc \u0645\u0627\u0646\u0639 \u0641\u0631\u0648\u0634 \u0628\u0644\u06cc\u0637 \u0628\u06cc\u0634\u062a\u0631 \u0627\u0632 \u0645\u0648\u062c\u0648\u062f\u06cc \u0646\u0645\u06cc\u200c\u0634\u0648\u062f. \u0628\u06cc\u0627\u06cc\u06cc\u062f \u0645\u062a\u062f buy()<\/code> \u0631\u0627 \u0637\u0648\u0631\u06cc \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0647\u06cc\u0645 \u06a9\u0647 \u0627\u06af\u0631 \u0645\u0648\u062c\u0648\u062f\u06cc \u0628\u0647 0 \u0631\u0633\u06cc\u062f\u060c \u062e\u0637\u0627\u06cc\u06cc \u0633\u0627\u0637\u0639 \u06a9\u0646\u062f.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 ticketManager.js<\/code> \u0631\u0627 \u0628\u0627\u0632 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    nano ticketManager.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0645\u062a\u062f buy()<\/code> \u0631\u0627 \u0628\u0647 \u0634\u06a9\u0644 \u0632\u06cc\u0631 \u0648\u06cc\u0631\u0627\u06cc\u0634 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    buy(email, price) {<\/div>\n
    if (this.supply > 0) {<\/div>\n
    this.supply–;<\/div>\n
    this.emit(“buy”, email, price, Date.now());<\/div>\n
    return;<\/div>\n
    }<\/div>\n
    <\/div>\n
    this.emit(“error”, new Error(“There are no more tickets left to purchase”));<\/div>\n
    }<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0630\u062e\u06cc\u0631\u0647 \u06a9\u0646\u06cc\u062f. \u062d\u0627\u0644\u0627 \u0641\u0627\u06cc\u0644 index.js<\/code> \u0631\u0627 \u0648\u06cc\u0631\u0627\u06cc\u0634 \u06a9\u0646\u06cc\u062f \u062a\u0627 4 \u0628\u0644\u06cc\u0637 \u0628\u062e\u0631\u06cc\u0645 (\u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 \u0645\u0648\u062c\u0648\u062f\u06cc 3 \u0627\u0633\u062a):<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    nano index.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0628\u0647 \u0627\u0646\u062a\u0647\u0627\u06cc \u0641\u0627\u06cc\u0644 \u062e\u0637\u0648\u0637 \u0632\u06cc\u0631 \u0631\u0627 \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    …<\/div>\n
    <\/div>\n
    ticketManager.buy(“test@email.com”, 10);<\/div>\n
    ticketManager.buy(“test@email.com”, 10);<\/div>\n
    ticketManager.buy(“test@email.com”, 10);<\/div>\n
    ticketManager.buy(“test@email.com”, 10);<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0630\u062e\u06cc\u0631\u0647 \u0648 \u0627\u062c\u0631\u0627 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    bash<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    node index.js<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0628\u0631\u0627\u06cc \u0633\u0647 \u062e\u0631\u06cc\u062f \u0627\u0648\u0644 \u0647\u0645\u0647 \u0686\u06cc\u0632 \u062e\u0648\u0628 \u067e\u06cc\u0634 \u0645\u06cc\u200c\u0631\u0648\u062f\u060c \u0627\u0645\u0627 \u062f\u0631 \u062e\u0631\u06cc\u062f \u0686\u0647\u0627\u0631\u0645 \u0628\u0631\u0646\u0627\u0645\u0647 \u06a9\u0631\u0634 \u0645\u06cc\u200c\u06a9\u0646\u062f:<\/p>\n

    <\/div>\n
    \n
    text<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    Output<\/div>\n
    …<\/div>\n
    events.js:196<\/div>\n
    throw er; \/\/ Unhandled ‘error’ event<\/div>\n
    ^<\/div>\n
    <\/div>\n
    Error: There are no more tickets left to purchase<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0627\u06af\u0631 \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f \u062e\u0637\u0627 \u0633\u0627\u0637\u0639 \u0634\u0648\u062f \u0648 \u0634\u0646\u0648\u0646\u062f\u0647\u200c\u0627\u06cc \u0628\u0631\u0627\u06cc \u0622\u0646 \u062b\u0628\u062a \u0646\u06a9\u0631\u062f\u0647 \u0628\u0627\u0634\u06cc\u0645\u060c Node.js \u062e\u0637\u0627 \u0631\u0627 \u067e\u0631\u062a\u0627\u0628 (Throw) \u06a9\u0631\u062f\u0647 \u0648 \u0628\u0631\u0646\u0627\u0645\u0647 \u0631\u0627 \u06a9\u0631\u0634 \u0645\u06cc\u200c\u06a9\u0646\u062f. \u0628\u0647\u062a\u0631\u06cc\u0646 \u0631\u0648\u0634 \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 \u0647\u0645\u06cc\u0634\u0647 \u0628\u0631\u0627\u06cc \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u062e\u0637\u0627 \u0634\u0646\u0648\u0646\u062f\u0647 \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u062f.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 index.js<\/code> \u0631\u0627 \u062f\u0648\u0628\u0627\u0631\u0647 \u0628\u0627\u0632 \u06a9\u0646\u06cc\u062f \u0648 \u0634\u0646\u0648\u0646\u062f\u0647 \u062e\u0637\u0627 \u0631\u0627 \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    …<\/div>\n
    <\/div>\n
    ticketManager.on(“error”, (error) => {<\/div>\n
    console.error(`Gracefully handling our error: ${error}`);<\/div>\n
    });<\/div>\n
    <\/div>\n
    ticketManager.buy(“test@email.com”, 10);<\/div>\n
    …<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0630\u062e\u06cc\u0631\u0647 \u0648 \u0627\u062c\u0631\u0627 \u06a9\u0646\u06cc\u062f. \u0627\u06cc\u0646 \u0628\u0627\u0631 \u0628\u0647 \u062c\u0627\u06cc \u06a9\u0631\u0634 \u06a9\u0631\u062f\u0646\u060c \u062e\u0637\u0627 \u0628\u0647 \u0634\u06a9\u0644 \u0632\u06cc\u0628\u0627\u06cc\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0645\u06cc\u200c\u0634\u0648\u062f:<\/p>\n

    <\/div>\n
    \n
    text<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    Output<\/div>\n
    Sending email to test@email.com<\/div>\n
    …<\/div>\n
    Gracefully handling our error: Error: There are no more tickets left to purchase<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n
    \n

    \u0645\u0631\u062d\u0644\u0647 \u06f5 \u2014 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646 \u0631\u0648\u06cc\u062f\u0627\u062f<\/h3>\n

    Event Emitter\u200c\u0647\u0627 \u0645\u06a9\u0627\u0646\u06cc\u0632\u0645\u200c\u0647\u0627\u06cc\u06cc \u0628\u0631\u0627\u06cc \u0645\u0627\u0646\u06cc\u062a\u0648\u0631\u06cc\u0646\u06af \u0648 \u06a9\u0646\u062a\u0631\u0644 \u062a\u0639\u062f\u0627\u062f \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646\u06cc \u06a9\u0647 \u062f\u0631 \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f \u0645\u0634\u062a\u0631\u06a9 \u0634\u062f\u0647\u200c\u0627\u0646\u062f \u062f\u0627\u0631\u0646\u062f. \u0628\u0631\u0627\u06cc \u062f\u0631\u06cc\u0627\u0641\u062a \u062a\u0639\u062f\u0627\u062f \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646 \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u0632 \u0645\u062a\u062f listenerCount()<\/code> \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645.<\/p>\n

    <\/div>\n

    \u0641\u0627\u06cc\u0644 index.js<\/code> \u0631\u0627 \u0628\u0627\u0632 \u06a9\u0646\u06cc\u062f \u0648 \u062a\u0645\u0627\u0645 \u0641\u0631\u0627\u062e\u0648\u0627\u0646\u06cc\u200c\u0647\u0627\u06cc buy()<\/code> \u0631\u0627 \u067e\u0627\u06a9 \u06a9\u0646\u06cc\u062f. \u0628\u0647 \u062c\u0627\u06cc \u0622\u0646 \u06a9\u062f\u0647\u0627\u06cc \u0632\u06cc\u0631 \u0631\u0627 \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const TicketManager = require(“.\/ticketManager”);<\/div>\n
    const EmailService = require(“.\/emailService”);<\/div>\n
    const DatabaseService = require(“.\/databaseService”);<\/div>\n
    <\/div>\n
    const ticketManager = new TicketManager(3);<\/div>\n
    const emailService = new EmailService();<\/div>\n
    const databaseService = new DatabaseService();<\/div>\n
    <\/div>\n
    ticketManager.on(“buy”, (email, price, timestamp) => {<\/div>\n
    emailService.send(email);<\/div>\n
    databaseService.save(email, price, timestamp);<\/div>\n
    });<\/div>\n
    <\/div>\n
    ticketManager.on(“error”, (error) => {<\/div>\n
    console.error(`Gracefully handling our error: ${error}`);<\/div>\n
    });<\/div>\n
    <\/div>\n
    console.log(`We have ${ticketManager.listenerCount(“buy”)} listener(s) for the buy event`);<\/div>\n
    console.log(`We have ${ticketManager.listenerCount(“error”)} listener(s) for the error event`);<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u062e\u0631\u0648\u062c\u06cc \u0646\u0634\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u062f \u06a9\u0647 \u0628\u0631\u0627\u06cc \u0647\u0631 \u0631\u0648\u06cc\u062f\u0627\u062f \u06cc\u06a9 \u0634\u0646\u0648\u0646\u062f\u0647 \u062f\u0627\u0631\u06cc\u0645.<\/p>\n

    <\/div>\n

    \u062f\u0631 Node.js \u0628\u0631\u0627\u06cc \u062d\u0630\u0641 \u06cc\u06a9 \u0634\u0646\u0648\u0646\u062f\u0647 \u0627\u0632 \u062a\u0627\u0628\u0639 off()<\/code> \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u0645. \u0627\u06cc\u0646 \u0645\u062a\u062f \u062f\u0648 \u0622\u0631\u06af\u0648\u0645\u0627\u0646 \u0645\u06cc\u200c\u06af\u06cc\u0631\u062f: \u0646\u0627\u0645 \u0631\u0648\u06cc\u062f\u0627\u062f \u0648 \u062a\u0627\u0628\u0639\u06cc \u06a9\u0647 \u0628\u0647 \u0622\u0646 \u06af\u0648\u0634 \u0645\u06cc\u200c\u062f\u0647\u062f. \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0628\u0631\u0627\u06cc \u062d\u0630\u0641 \u06cc\u06a9 \u0634\u0646\u0648\u0646\u062f\u0647\u060c \u062a\u0627\u0628\u0639 Callback \u0622\u0646 \u0628\u0627\u06cc\u062f \u062f\u0631 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0630\u062e\u06cc\u0631\u0647 \u0634\u062f\u0647 \u0628\u0627\u0634\u062f.<\/p>\n

    <\/div>\n

    \u0628\u0647 \u0627\u0646\u062a\u0647\u0627\u06cc \u0641\u0627\u06cc\u0644 index.js<\/code> \u0627\u0636\u0627\u0641\u0647 \u06a9\u0646\u06cc\u062f:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    const onBuy = () => {<\/div>\n
    console.log(“I will be removed soon”);<\/div>\n
    };<\/div>\n
    <\/div>\n
    ticketManager.on(“buy”, onBuy);<\/div>\n
    <\/div>\n
    console.log(`We added a new event listener bringing our total count for the buy event to: ${ticketManager.listenerCount(“buy”)}`);<\/div>\n
    ticketManager.buy(“test@email”, 20);<\/div>\n
    <\/div>\n
    ticketManager.off(“buy”, onBuy);<\/div>\n
    <\/div>\n
    console.log(`We now have: ${ticketManager.listenerCount(“buy”)} listener(s) for the buy event`);<\/div>\n
    ticketManager.buy(“test@email”, 20);<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u0627\u06af\u0631 \u0641\u0627\u06cc\u0644 \u0631\u0627 \u0627\u062c\u0631\u0627 \u06a9\u0646\u06cc\u062f\u060c \u0645\u06cc\u200c\u0628\u06cc\u0646\u06cc\u062f \u06a9\u0647 \u067e\u0633 \u0627\u0632 \u062d\u0630\u0641 \u0634\u0646\u0648\u0646\u062f\u0647 \u062f\u0648\u0645\u060c \u0641\u0642\u0637 \u0634\u0646\u0648\u0646\u062f\u0647 \u0627\u0648\u0644 (\u0627\u0631\u0633\u0627\u0644 \u0627\u06cc\u0645\u06cc\u0644 \u0648 \u0630\u062e\u06cc\u0631\u0647 \u062f\u0631 \u062f\u06cc\u062a\u0627\u0628\u06cc\u0633) \u0628\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f \u0648\u0627\u06a9\u0646\u0634 \u0646\u0634\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u062f.<\/p>\n

    <\/div>\n

    \u0627\u06af\u0631 \u0628\u062e\u0648\u0627\u0647\u06cc\u0645 \u062a\u0645\u0627\u0645 \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646 \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f \u062e\u0627\u0635 \u0631\u0627 \u062d\u0630\u0641 \u06a9\u0646\u06cc\u0645\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u0632 \u062a\u0627\u0628\u0639 removeAllListeners()<\/code> \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645:<\/p>\n

    <\/div>\n
    \n
    javascript<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n
    \n
    \n
    ticketManager.removeAllListeners(“buy”);<\/div>\n
    console.log(`We have ${ticketManager.listenerCount(“buy”)} listeners for the buy event`);<\/div>\n
    ticketManager.buy(“test@email”, 20);<\/div>\n
    console.log(“The last ticket was bought”);<\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n

    \u067e\u0633 \u0627\u0632 \u062d\u0630\u0641 \u062a\u0645\u0627\u0645 \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646\u060c \u062f\u06cc\u06af\u0631 \u0647\u06cc\u0686 \u0648\u0627\u06a9\u0646\u0634\u06cc \u0628\u0647 \u062e\u0631\u06cc\u062f \u0628\u0644\u06cc\u0637\u200c\u0647\u0627 \u0635\u0648\u0631\u062a \u0646\u0645\u06cc\u200c\u06af\u06cc\u0631\u062f.<\/p>\n

    <\/div>\n
    \n

    \u0646\u062a\u06cc\u062c\u0647\u200c\u06af\u06cc\u0631\u06cc<\/strong><\/p>\n

    <\/div>\n

    \u062f\u0631 \u0627\u06cc\u0646 \u0622\u0645\u0648\u0632\u0634\u060c \u06cc\u0627\u062f \u06af\u0631\u0641\u062a\u06cc\u062f \u06a9\u0647 \u0686\u06af\u0648\u0646\u0647 \u0627\u0632 Event Emitter\u200c\u0647\u0627\u06cc Node.js \u0628\u0631\u0627\u06cc \u0631\u0627\u0647\u200c\u0627\u0646\u062f\u0627\u0632\u06cc \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f. \u0634\u0645\u0627 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0631\u0627 \u0628\u0627 emit()<\/code> \u0633\u0627\u0637\u0639 \u06a9\u0631\u062f\u06cc\u062f\u060c \u0628\u0627 on()<\/code> \u0648 once()<\/code> \u0628\u0647 \u0622\u0646\u200c\u0647\u0627 \u06af\u0648\u0634 \u062f\u0627\u062f\u06cc\u062f\u060c \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u062e\u0637\u0627 \u0631\u0627 \u0645\u062f\u06cc\u0631\u06cc\u062a \u06a9\u0631\u062f\u06cc\u062f \u0648 \u0628\u0627 listenerCount()<\/code> \u0648 off()<\/code> \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646 \u0631\u0627 \u0645\u0627\u0646\u06cc\u062a\u0648\u0631 \u0648 \u0645\u062f\u06cc\u0631\u06cc\u062a \u06a9\u0631\u062f\u06cc\u062f.<\/p>\n

    <\/div>\n

    \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 Callback\u200c\u0647\u0627 \u0648 Promise\u200c\u0647\u0627\u060c \u0633\u06cc\u0633\u062a\u0645 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0628\u0644\u06cc\u0637 \u0634\u0645\u0627 \u0628\u0627\u06cc\u062f \u0645\u0633\u062a\u0642\u06cc\u0645\u0627\u064b \u0628\u0627 \u0645\u0627\u0698\u0648\u0644\u200c\u0647\u0627\u06cc \u0627\u06cc\u0645\u06cc\u0644 \u0648 \u062f\u06cc\u062a\u0627\u0628\u06cc\u0633 \u0627\u062f\u063a\u0627\u0645 \u0645\u06cc\u200c\u0634\u062f \u062a\u0627 \u0639\u0645\u0644\u06a9\u0631\u062f \u06cc\u06a9\u0633\u0627\u0646\u06cc \u0628\u0647 \u062f\u0633\u062a \u0622\u06cc\u062f. \u0627\u0645\u0627 \u0627\u0632 \u0622\u0646\u062c\u0627\u06cc\u06cc \u06a9\u0647 \u0627\u0632 Event Emitter\u200c\u0647\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f\u06cc\u0645\u060c \u0631\u0648\u06cc\u062f\u0627\u062f \u0627\u0632 \u067e\u06cc\u0627\u062f\u0647\u200c\u0633\u0627\u0632\u06cc\u200c\u0647\u0627\u06cc \u0622\u0646 \u062c\u062f\u0627 (Decouple) \u0634\u062f. \u0647\u0631 \u0645\u0627\u0698\u0648\u0644\u06cc \u06a9\u0647 \u0628\u0647 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0628\u0644\u06cc\u0637 \u062f\u0633\u062a\u0631\u0633\u06cc \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u062f \u0631\u0648\u06cc\u062f\u0627\u062f \u0622\u0646 \u0631\u0627 \u0645\u0634\u0627\u0647\u062f\u0647 \u06a9\u0631\u062f\u0647 \u0648 \u0628\u0647 \u0622\u0646 \u0648\u0627\u06a9\u0646\u0634 \u0646\u0634\u0627\u0646 \u062f\u0647\u062f. \u0627\u06cc\u0646 \u0645\u0639\u0645\u0627\u0631\u06cc \u0645\u0642\u06cc\u0627\u0633\u200c\u067e\u0630\u06cc\u0631\u06cc (Scalability) \u0628\u0633\u06cc\u0627\u0631 \u062e\u0648\u0628\u06cc \u0628\u0647 \u0627\u067e\u0644\u06cc\u06a9\u06cc\u0634\u0646 \u0634\u0645\u0627 \u0645\u06cc\u200c\u0628\u062e\u0634\u062f.<\/p>\n

    \n

    \n

    \n

    \n

    \u0627\u0632 \u0647\u0645\u0631\u0627\u0647\u06cc \u0634\u0645\u0627 \u0628\u0627 \u067e\u0627\u0631\u0645\u06cc\u0646 \u06a9\u0644\u0648\u062f<\/a><\/strong> \u0633\u067e\u0627\u0633\u06af\u0632\u0627\u0631\u06cc\u0645.<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u0645\u0642\u062f\u0645\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 (Events) \u062f\u0631 Node.js \u062a\u0648\u0633\u0637 \u0622\u0628\u062c\u06a9\u062a\u200c\u0647\u0627\u06cc\u06cc \u0628\u0647 \u0646\u0627\u0645 Event Emitter (\u0633\u0627\u0637\u0639\u200c\u06a9\u0646\u0646\u062f\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f) \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u0634\u0648\u0646\u062f \u06a9\u0647 \u0628\u0627 \u0627\u0631\u0633\u0627\u0644 \u06cc\u06a9 \u067e\u06cc\u0627\u0645\u060c \u0648\u0642\u0648\u0639 \u06cc\u06a9 \u0639\u0645\u0644\u06cc\u0627\u062a \u0631\u0627 \u0639\u0644\u0627\u0645\u062a\u200c\u06af\u0630\u0627\u0631\u06cc \u0645\u06cc\u200c\u06a9\u0646\u0646\u062f. \u062a\u0648\u0633\u0639\u0647\u200c\u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u062c\u0627\u0648\u0627\u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u06a9\u062f\u06cc \u0628\u0646\u0648\u06cc\u0633\u0646\u062f \u06a9\u0647 \u0628\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627\u06cc \u06cc\u06a9 Event Emitter \u06af\u0648\u0634 \u0645\u06cc\u200c\u062f\u0647\u062f (Listen)\u060c \u06a9\u0647 \u0627\u06cc\u0646 \u0628\u0647 \u0622\u0646\u200c\u0647\u0627 \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc\u200c\u062f\u0647\u062f \u0647\u0631 \u0628\u0627\u0631 \u0627\u06cc\u0646 \u0631\u0648\u06cc\u062f\u0627\u062f\u0647\u0627 \u0631\u062e \u062f\u0627\u062f\u0646\u062f\u060c \u062a\u0648\u0627\u0628\u0639 \u062e\u0627\u0635\u06cc \u0631\u0627 …<\/p>\n","protected":false},"author":9,"featured_media":6777,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-6776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-8"],"_links":{"self":[{"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/posts\/6776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/comments?post=6776"}],"version-history":[{"count":0,"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/posts\/6776\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/media\/6777"}],"wp:attachment":[{"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/media?parent=6776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/categories?post=6776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/parmin.cloud\/blog\/wp-json\/wp\/v2\/tags?post=6776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}