vue2中websocket的使用

        项目中需要在某些情况主动给浏览器端发送消息，浏览器接收后做相应的处理。实现方法如下：

创建websocket.js:

import store from '@/store'
import Cookie from 'js-cookie'
import {notification } from 'ant-design-vue'


var websocket = null;
let rec; //用来存储延迟请求的代码
let isConnect = false; //连接标识 避免重复连接
let checkMsg = "heartbeat"; //心跳发送/返回的信息 
const baseUrl = process.env.VUE_APP_WEBSOCKET_URL // ws的地址
var globalCallback = function () {};

let createWebSocket = () => {
    try {
        initWebSocket(); 
    } catch (e) {
        reConnect(); 
    }
};

//重连
let reConnect = () => {
    if (isConnect) return; 
    rec && clearTimeout(rec);
    rec = setTimeout(function () { 
        createWebSocket();
    }, 10000);
};
//关闭连接
let closeWebSocket = () => {
  websocket.close();
};
//心跳设置
var heartCheck = {
    timeout: 20000, 
    timeoutObj: null, 

    start: function () {
        this.timeoutObj = setTimeout(function () {
            if (isConnect) websocket.send(checkMsg);
        }, this.timeout);
    },

    reset: function () {
        clearTimeout(this.timeoutObj);
        this.start();
    }
};

// 初始化websocket
function initWebSocket() {

    const userKey = xxxx // 生成的唯一编码
    var ws = baseUrl + '?userKey ='+userKey 
     websocket = new WebSocket(ws) //
    websocket.onmessage = function (e) {
        websocketonmessage(e)
    }
    websocket.onclose = function (e) {
        websocketclose(e)
    }
    websocket.onopen = function () {
        websocketOpen()
        heartCheck.start();
    }
    websocket.onerror = function () {
        isConnect = false; 
        reConnect(); 
    }
}


// 接收消息
function websocketonmessage(e) {
   if(e && e.data){
        try{
            ...
           // 需要处理的事件
                
        }catch(error){
            
        }
   }else{
    heartCheck.reset();
   }
   
}

// 数据发送
function websocketsend(agentData) {
    websocket.send(JSON.stringify(agentData))
}

// 关闭
function websocketclose(e) {
    isConnect = false 
}

function websocketOpen() {
    
}


// 将方法暴露出去
export {
    createWebSocket,
    closeWebSocket
}