微信小程序怎么使用websocket？

小程序js代码

var sotk = null;
var socketOpen = false;
var wsbasePath = "ws://后端ip或域名:9504";


Page({


  //监听指令
  webSokcketMethods(e) {
    let that = this;
    sotk.onOpen(res => {
      socketOpen = true;
      console.log('监听 WebSocket 连接打开事件。', res);
      that.sendSocketMessage("hello");
    })
    sotk.onClose(onClose => {
      console.log('监听 WebSocket 连接关闭事件。', onClose)
      socketOpen = false;
    })
    sotk.onError(onError => {
      console.log('监听 WebSocket 错误。错误信息', onError)
      socketOpen = false
    })

    sotk.onMessage(onMessage => {
      var data = JSON.parse(onMessage.data);
      console.log('监听WebSocket接受到服务器的消息事件。服务器返回的消息', data);

    })

  },

  //发送消息
  sendSocketMessage(msg) {
    let that = this;
    if (socketOpen) {
      console.log('通过 WebSocket 连接发送数据', JSON.stringify(msg))
      sotk.send({
        data: JSON.stringify(msg)
      }, function (res) {
        console.log('已发送', res)
      })
    }

  },
  //关闭连接
  closeWebsocket(str) {
    if (socketOpen) {
      sotk.close({
        code: "1000",
        reason: str,
        success: function () {
          console.log("成功关闭websocket连接");
        }
      })
    }
  },
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {



  },
  c...

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