vue使用websocket概念及示例

<script>
export default {
  mounted() {
    this.connectWebsocket();
  },
  methods: {
    connectWebsocket() {
      let websocket;
      if (typeof WebSocket === "undefined") {
        console.log("您的浏览器不支持WebSocket");
        return;
      } else {
        let protocol = "ws";
        let url = "";
        if (window.localtion.protocol == "https:") {
          protocol = "wss";
        }
        // `${protocol}://window.location.host/echo`;
        url = `${protocol}://localhost:9998/echo`;

        // 打开一个websocket
        websocket = new WebSocket(url);
        // 建立连接
        websocket.onopen = () => {
          // 发送数据
          websocket.send("发送数据");
          console.log("websocket发送数据中");
        };
        // 客户端接收服务端返回的数据
        websocket.onmessage = evt => {
          console.log("websocket返回的数据：", evt);
        };
        // 发生错误时
        websocket.onerror = evt => {
          console.log("websocket错误：", evt);
        };
        // 关闭连接
        websocket.onclose = evt => {
          console.log("websocket关闭：", evt);
        };
      }
    }
  }
};
</script>