用户主动断开后，再重连，onMessage消息重复出现

//TCP连接 按键
 connectSocketFunciton() {
  
  var that = this
  var address = that.globalData.inputIP
    var port=that.globalData.inputPort
    console.log(address,port)
  tcp.connect({
    address:address,
    port:port,
   timeout:3,   
  })
  tcp.onError((e)=>{
    console.log(e)
    let iszhuangtai=false
    that.callzt(iszhuangtai)
    wx.showToast({
      title: "连接失败",
      icon: 'none',
      duration: 2000,//持续的时间
  })
  })
  //TCP监听
   tcp.onMessage((e)=>{
    var util=require('pages/utils/util.js')
    var that = this
    var time= util.formatDate(new Date());
    // console.log(e.message)
    var jieshou= e.remoteInfo
    var buffer = e.message;
    var dataview = new DataView(buffer);
    var ints = new Uint8Array(buffer.byteLength);
    var str = '',ceshi='';
    for (var i = 0; i < ints.length; i++) {
            str+= String.fromCharCode(dataview.getUint8(i));
    }    
    console.log("直接接受的消息，未处理",e)
    console.log(str ,jieshou)
    var shuju="@["+jieshou.address+"]-" +time+':\n'+ str
    this.globalData.message=shuju
   // if (this.onMessage) this.onMessage(shuju);
    
    that.callback(shuju)
    return str


})


},
//断开连接
tcpcloce(res){
  var that =this
  tcp.close()
  //this.onMessage =null
 // tcp.onMessage = null;
  that.globalData.iszhuangtai = false
  wx.showToast({
    title: "连接断开",
    icon: 'none',
    duration: 2000,//持续的时间
})


},