【笔记】Nodejs的事件

发表于 2026-05-30 分类于 Nodejs学习指北阅读次数：

前言

Nodejs通过events模块实现对事件的操作

1	const EventEmitter = require("events");

1	const emitter = new EventEmitter();

1	emitter.emit("event", "payload");

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emitter.on("event", function (payload) {
  ...
});

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emitter.once("event", function (payload) {
  ...
});

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emitter.prependListener("event", function (payload) {
  ...
});

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emitter.prependOnceListener("event", function (payload) {
  ...
});

function fn(payload) {
  ...
}

emitter.on("event", fn);

emitter.off("event", fn);

1	emitter.removeAllListeners("event");

1	emitter.removeAllListeners();