// pages/index/to_news/to_news.js 
var app = getApp();
var socketOpen = false;
var SocketTask = false;
var url = 'ws://192.168.0.120:7011';
Page({
 data: {
  inputValue: '',
  returnValue: '',
 },
 onLoad: function (options) {
 },
 onReady: function () {
  // 创建Socket
  SocketTask = wx.connectSocket({
   url: url,
   data: 'data',
   header: {
    'content-type': 'application/json'
   },
   method: 'post',
   success: function (res) {
    console.log('WebSocket连接创建', res)
   },
   fail: function (err) {
    wx.showToast({
     title: '网络异常！',
    })
    console.log(err)
   },
  })
  if (SocketTask) {
   SocketTask.onOpen(res => {
    console.log('监听 WebSocket 连接打开事件。', res)
   })
   SocketTask.onClose(onClose => {
    console.log('监听 WebSocket 连接关闭事件。', onClose)
   })
   SocketTask.onError(onError => {
    console.log('监听 WebSocket 错误。错误信息', onError)
   })
   SocketTask.onMessage(onMessage => {
    console.log('监听WebSocket接受到服务器的消息事件。服务器返回的消息', onMessage)
   })
  }
 },
 
 // 提交文字
 submitTo: function (e) {
  let that = this;
  that.data.allContentList.push({that.data.inputValue });
  that.setData({
   allContentList: that.data.allContentList
  })
  var data = {
   text: that.data.inputValue
  }
  if (socketOpen) {
   // 如果打开了socket就发送数据给服务器
   sendSocketMessage(data)
  }
 },
 bindKeyInput: function (e) {
  this.setData({
   inputValue: e.detail.value
  })
 },
 
 onHide: function () {
   SocketTask.close(function (close) {
    console.log('关闭 WebSocket 连接。', close)
   })
 },
})
 
//通过 WebSocket 连接发送数据，需要先 wx.connectSocket，并在 wx.onSocketOpen 回调之后才能发送。
function sendSocketMessage(data) {
 console.log('通过 WebSocket 连接发送数据')
 if (socketOpen) {
  SocketTask.send({data: JSON.stringify(data)
  }, function (res) {
   console.log('已发送', res)
  })
 } else {
  socketMsgQueue.push(msg)
 }
} 

<input type="text" bindinput="bindKeyInput" value='{{inputValue}}' placeholder="" />
<button bindtap="submitTo" class='user_input_text'>发送</button>