mounted(){
 console.log(this)----------------------------------------------------------this指向vue
 this.initWebpack();
},
methods: {
  initWebpack() {
    let websocket = '';
    if ('WebSocket' in window) {
      websocket = new WebSocket("ws://192.168.1.99:8080/tv/websocket");
    } else {
      alert('當(dāng)前瀏覽器 Not support websocket')
    } //連接成功建立的回調(diào)方法 websocket.onopen = function () { console.log("WebSocket連接成功")
    console.log(this)----------------------------------------------------------this指向websocket
  };
//接收到消息的回調(diào)方法
websocket.onmessage = function (event) {
console.log(this)
console.log(event);
 this.productinfos=JSON.parse(event.data);//websocket請(qǐng)求過(guò)來(lái)的是string 需要格式
 if(demo.offsetHeight<demo1.offsetHeight){//內(nèi)部比外部高度大的時(shí)候滑動(dòng)
this.upScroll()//這是this指向websocket 所以沒(méi)有此方法 會(huì)報(bào)錯(cuò)
}
this.sliceArray() }
 }
 };
//連接關(guān)閉的回調(diào)方法 websocket.onclose = function () {
console.log("WebSocket連接關(guān)閉");
};
//連接發(fā)生錯(cuò)誤的回調(diào)方法 websocket.onerror = function () {
console.log("WebSocket連接發(fā)生錯(cuò)誤");
};
//監(jiān)聽(tīng)窗口關(guān)閉事件，當(dāng)窗口關(guān)閉時(shí)，主動(dòng)去關(guān)閉websocket連接，防止連接還沒(méi)斷開(kāi)就關(guān)閉窗口，server端會(huì)拋異常。
 window.onbeforeunload = function () {
websocket.close();
//關(guān)閉WebSocket連接 };
 },
sliceArray(){//截取數(shù)組的后四位 },
 upScroll(){ },
}

methods:{
 initWebpack(){//初始化websocket
  const wsuri = "ws地址";
  this.websock = new WebSocket(wsuri);//這里面的this都指向vue
  this.websock.onopen = this.websocketopen;
  this.websock.onmessage = this.websocketonmessage;
  this.websock.onclose = this.websocketclose;
  this.websock.onerror = this.websocketerror;
 },
 websocketopen(){//打開(kāi)
  console.log("WebSocket連接成功")
 },
 websocketonmessage(e){ //數(shù)據(jù)接收
  console.log(e)
  this.productinfos = JSON.parse(e.data);
 },
 websocketclose(){ //關(guān)閉
  console.log("WebSocket關(guān)閉");
 },
 websocketerror(){ //失敗
  console.log("WebSocket連接失敗");
 },
}