[网络协议]websocket实时推送及重连机制

import { Notification } from 'element-ui'
const soket = {
  url: 'ws://xxxxxxxxxxxxxxxxxxxxxxx',
  ws: null,
  lockReconnect: true,

  // 实例websocket
  websocketFunc() {
    try {
      if ('WebSocket' in window) {
        this.ws = new WebSocket(this.url)
      } else {
        alert('当前浏览器不支持websocket协议', 3000)
      }
      this.initEventHandle()
    } catch (e) {
      this.reconnect()
    }
  },

  // 初始化事件函数
  initEventHandle() {
    this.ws.onclose = function() {
      console.log('报警推送关闭链接')
      if (soket.lockReconnect) {
        soket.reconnect()
      }
    }
    this.ws.onerror = function() {
      soket.reconnect()
    }
    // 连接成功建立的回调方法
    this.ws.onopen = function() {
      console.log('消息推送链接成功')
    }
    // 接收到消息的回调方法
    this.ws.onmessage = function(event) {
      var res = JSON.parse(event.data)
      console.log(res)
      Notification({
        type: 'success',
        title: '消息提醒',
        message: res.message,
        position: 'top-right',
        duration: 0
      })
    }
    // 监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function() {
      soket.lockReconnect = false
      this.ws.close()
    }
  },
  
  // 关闭连接
  closeWebSocket() {
    soket.lockReconnect = false
    this.ws.close()
    console.log('websocket已关闭！')
  },
  
  // 重连
  reconnect() {
    setTimeout(function() { // 没连接上会一直重连，设置延迟避免请求过多
      console.log('尝试重连...' + new Date())
      soket.websocketFunc()
    }, 2000)
  }
  
}
export default soket