做网站一般费用多少在线crm网站建站

/**** 同源下的全局事件总线，支持跨标签页通信* 第一步：注册事件* 第二步：广播事件* 第三步：处理事件*/// source：消息发起源href，将在跨标签页通信时传入
interface callback {(data: any, source: any): void
}
type eventName = string;class EventBus {protected eventMap: any = new Map();protected channel: any = new BroadcastChannel('__event-bus');protected register(eventName: eventName, callback: callback) {if (!this.eventMap.has(eventName)) {this.eventMap.set(eventName, [])}this.eventMap.get(eventName).push(callback)}protected tryRunCallback(eventName: eventName, data: any, source?: string) {if (!this.eventMap.has(eventName)) return;this.eventMap.get(eventName).forEach((callback: callback) => {callback(data, source)});}// 广播事件emit(eventName: eventName, data?: any) {this.tryRunCallback(eventName, data);// 跨标签页 发送消息this.channel.postMessage({ eventName, data, source: location.href })}// 订阅事件on(eventName: eventName, callback: callback) {this.register(eventName, callback);// 跨标签页 接收订阅消息this.channel.onmessage = (event: { data: any }) => {const data = event.data;this.tryRunCallback(data.eventName, data.data, data.source)}}// 移除某个订阅事件off(eventName: eventName, callback: callback) {if (!this.eventMap.has(eventName)) return;const callbacks = this.eventMap.get(eventName)this.eventMap.set(eventName, callbacks.filter((cb: callback) => cb !== callback))}// 清除某个事件的所有订阅clear(eventName: eventName) {this.eventMap.delete(eventName)}// 清除所有订阅事件clearAll() {this.eventMap = new Map()}
}export default new EventBus()

如何使用：

import Event from "EventBus"Event.on('事件名', () => { //....
})Event.emit('事件名', { ...数据 })