语音播放会有一个问题，因为浏览器做了限制，只有用户点击了当前页面，才能触发媒体播放。

<template>
  <div></div>
</template>

<script>
export default {
  data() {
    return {
      audio: null,
      socket: null,
      timeout: 30 * 1000,
      heartBeatTimer: null,
      reconnectTimer: null
    }
  },
  methods: {
    initWebSocket() {
      this.createWebSocket();
      this.reconnectTimer = window.setInterval(() => {
        if (this.socket.readyState === 3) {
          this.stopHeartBeat();
          this.createWebSocket();
        }
      }, 60000)
    },
    stopHeartBeat() {
      this.heartBeatTimer = setInterval(() => {
        this.socket.send('hello server!');
      }, this.timeout);
    },
    startHeartBeat() {
      clearInterval(this.heartBeatTimer);
      this.heartBeatTimer = null;
    },
    createWebSocket() {
      const host = window.location.host;
      this.socket = new WebSocket(`wss://${host}/websocket`);
      this.socket.onopen = this.onopen;
      this.socket.onmessage = this.onmessage;
      this.socket.onclose = this.onclose;
      this.socket.onerror = this.onerror;
    },
    //用于指定连接成功后的回调函数。
    onopen(event) {
      this.startHeartBeat();
    },
    //用于指定当从服务器接受到信息时的回调函数。
    onmessage(event) {
      let self = this;
      let message = JSON.parse(event.data);
      if (message.type == 'sessionId') {
        //save sessionId
      } else {
        self.audio.play();
        //做业务处理
      }
    },
    //用于指定连接关闭后的回调函数。
    onclose(event) {
      console.log('成功关闭链接', event);
    },
    //用于指定连接失败后的回调函数。
    onerror(event) {
      console.log('链接出错', event);
    }
  },
  created() {
    this.audio = new Audio(require('./assets/audio/audio.mp3'));
  },
  mounted() {
    this.initWebSocket();
  },
  beforeDestroy() {
    this.socket.close();
    clearInterval(this.heartBeatTimer);
    clearInterval(this.reconnectTimer);
    this.heartBeatTimer = null;
    this.reconnectTimer = null;
  }
}
</script>