ssh---配置密钥对验证

（一）首先去nginx配置websocket的通信协议

（二）然后编写wx.js代码

Page({
  data: {
    socketStatus: 'closed',
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    var that = this;
    if (that.data.socketStatus === 'closed') {
      that.openSocket();
    }

  },

  openSocket:function() {
    //打开时的动作
     wx.onSocketOpen(() => {
       console.log('WebSocket 已连接')
       this.data.socketStatus = 'connected';
       this.sendMessage();
     })
     //断开时的动作
     wx.onSocketClose(() => {
       console.log('WebSocket 已断开')
       this.data