给网站公司做网站简述什么是seo

使用原因：用户网络环境较差，之前使用ws总是出现断连重连，导致数据总是不能实时更新，所以更换为sse

npm install event-source-polyfill

createWebSocket：创建sse连接 

getWebSocketMsg：接收sse消息

  import { EventSourcePolyfill } from "event-source-polyfill";import { getToken } from '@/utils/auth'class webSocketClass {constructor(name) {this.localUrl = `http`; //直连阿里云正式环境this.globalCallback = null;this.createWebSocket(name);this.readyState = 0;}createWebSocket(url) {var that =this// 建立连接this.eventSource = new EventSourcePolyfill(this.localUrl+ url,{// 设置重连时间heartbeatTimeout: 60 * 60 * 1000,// 添加tokenheaders: {Authorization: `Bearer ${getToken()}`,},});this.eventSource.onopen = (e) => {console.log("已建立SSE连接~");};this.eventSource.onmessage = (e) => {const d = JSON.parse(e.data);console.log("sse已接受到消息:", d);that.getWebSocketMsg(that.globalCallback);};this.eventSource.onerror = (e) => {console.log("SSE连接错误" + e.readyState);if (e.readyState == EventSource.CLOSED) {console.log("SSE连接关闭");} else if (this.eventSource.readyState == EventSource.CONNECTING) {console.log("SSE正在重连");//重新设置tokenthis.eventSource.headers = {Authorization: `Bearer ${getToken()}`,};} else {console.log("error", e);}};}getWebSocketMsg(callback) {console.log("开始接收sse消息~",this.eventSource);this.eventSource.onmessage = (ev) => {callback && callback(ev);};}close(){this.eventSource.close()console.log("SSE关闭" + e.readyState);}
}
export default webSocketClass;

使用方法：

  this.warningSSE = new vueSSEUtil('/sse/warning/'+this.userId);this.warningSSE.getWebSocketMsg((evt) => {const d = JSON.parse(evt.data);d.warnCode = this.code_to_value(d.warnCode);console.log('sse回调数据',d) });

一定要在页面退出关闭sse

this.warningSSE.close()