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同步链接: https://www.shanejix.com/posts/[Snippet] - EventEmitter/
API
- subscribe / addListener / on - publish / emit - unsubscribe / removeListener / off
EventEmitter
class EventEmitter { constructor() { /** * 订阅中心 * * {"type":[callback1,callback2,...]} * */ this.events = {}; } /** * subscribe event * @param {*} type * @param {*} callback */ on(type, callback) { if (this.events[type]) { // 当前 type 类型已经订阅,则在数组后追加 this.events[type].push(callback); } else { // 当前 type 类型未订阅,则初始化数组 this.events[type] = [callback]; } } /** * subscribe event * @param {*} type * @param {*} callback */ subscribe(type, callback) { this.on(type, callback); } /** * subscribe event * @param {'*'} type * @param {*} callback */ addListener(type, callback) { this.on(type, callback); } /** * emit event * @param {*} type */ emit(type) { // 通知执行当前 type 类型的所有回调函数 if (this.events[type] && this.events[type].length) { this.events[type].forEach((callback) => { callback(); }); } } /** * emit event * @param {*} type */ publish(type) { this.emit(type); } /** * off event * @param {*} type * @param {*} callback */ off(type, callback) { // 取消订阅当前 type 类型的 callback 回调 if (this.events[type] && this.events[type].length) { this.events[type] = this.events[type].filter((cb) => cb !== callback); } } /** * off event * @param {*} type * @param {*} callback */ unsubscribe(type, callback) { this.off(type, callback); } /** * off event * @param {*} type * @param {*} callback */ removeListener(type, callback) { this.off(type, callback); } }
usage
const eventEmitter = new EventEmitter(); eventEmitter.on("type", () => { console.log("type executed"); }); eventEmitter.emit("type");
作者:shanejix 出处:https://www.shanejix.com/posts/[Snippet] - EventEmitter/ 版权:本作品采用「署名-非商业性使用-相同方式共享 4.0 国际」许可协议进行许可。 声明:转载请注明出处!
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API
EventEmitter
usage
The text was updated successfully, but these errors were encountered: