//时间戳
var sceneid ="scend-" + new Data().getTime() + Math.ceil(Math.random()*888888+1000000);
建立websocket
var ws = new WebSocket("ws://192.168.0.106/websocket"+sceneid )
ws.onopen=function(env){
 console.log(env)
} 
ws.onmessage=function(env){
 var data = env.data;
 //这个data 就是后端发来的用户数据
} 

func (ctrl *PushCtrl) websocket(w http.ResponseWriter, req *http.Request) {
 //fmt.Printf("%+v",request.Header)
 //todo 检验接入是否合法
 //checkToken(userId int64,token string)
 query := req.URL.Query()
 clientid := query.Get("clientid")
 conn, err := (&websocket.Upgrader{
  CheckOrigin: func(r *http.Request) bool {
   return true
  },
 }).Upgrade(w, req, nil)
 if err != nil {
  log.Println(err.Error())
  return
 }
 clientMap.Store(clientid, conn)
 go func(clientId string, conn *websocket.Conn) {
  //处理出错信息
  defer func() {
   conn.Close()
   clientMap.Delete(clientid)
  }()
  for {
   _, _, err := conn.ReadMessage()
   if err != nil {
    log.Println(err.Error())
    return
   }
  }
 }(clientid, conn)
}

accesstoken :=""
func GetAccessToken() string{
 return accesstoken 
}
func RefreshAccessToken()string{
 url = ""
 resp := httpget(url)
 //resp 是一个包含accesstoken的json字符串,我们解析这个json即可
 accesstoken = decodeaccesstokenfromjson(resp)
 return accesstoken 
}

func refreshAccessToken(){
 ticker := time.NewTicker(time.Second *4000)
 for{
  select {
   case <-ticker.C:
    RefreshAccessToken()
  }
 }
}

{
"errcode":400001,
"errmsg":"什么什么原因"
}

{
code:0,
data:"",
msg:"结果说明"
}

url := fmt.Sprintf("https://api.weixin.qq.com/wxa/getwxacodeunlimit", token)
ret, err := util.PostJSON(url, arg)
if err != nil {
    util.FailMsg(w, err.Error())
    return
}

jsonstr := string(ret)
if strings.Contains(jsonstr, "errmsg") {
  util.FailMsg(w, jsonstr)
  return
} else {
  base64data := base64.StdEncoding.EncodeToString(ret)
  util.RespOk(w, "data:image/png;base64,"+base64data)
}

function refreshqrcode(){
  clientId = "scene-"+new Date().getTime();
  var api = restgo.buildapi("miniapp/getwxacodeunlimit")
  restgo.post(api,{"scene":clientId}).then(res=>{
    if(res.code==200){
      $("#qrcode").attr("src",res.data)
    }else{
      alert(res.msg)  
    }
    intiwebsocket()
  },res=>{
    alert(res.msg)
  })
}

watch:{
   userid:function(a,b){
      
      if(a==0){
        return 
      }
      
      this.loaddata()
      //如果clientid是空的说明不是扫码进来的  
      if(!this.clientid){
        return 
      }
//如果是扫码进来的,那么我们还需要推送消息到服务器后端
server.PublishMsg(this.clientid,this.userid,this.role,this.avatarUrl,this.nickName).then(res=>{
        tip.error(res.msg)
      },res=>{
        tip.error(res.msg)
      })
      
   }
 }

onLoad(arg) {
    if(!!arg && !!arg.scene){
          this.clientid = decodeURIComponent(arg.scene)
    }
        
  },

gotUserInfo :function(e) {
       //获得用户头像、昵称、
       uni.login(
       {
         success:(res) =>{
              //通过wx.login获得code
              userInfo.code = res.code
                        //统一传递到后端   
            this.authwithcode(userInfo)
         }
       }
       )
      }
     },
    authwithcode:function(userInfo){
            //code获得openid在后端做,做了后继续去查User表
      server.AuthWithCode(userInfo).then(res=>{
          //如果这个openid绑定了用户                                  
          if(res.data.id>0){
            //这里res.data 就是user对象,可以继续操作
            return ;
          }
          //如果没有那么注册
          server.RegisterWithOpenId(res.data.mini_openid,userInfo.avatarUrl,userInfo.nickName)#.then(res=>{
            //注册成功则返回
            //这里res.data 就是user对象可以继续操作
            
          },res=>{
            tip.error(res.msg)
          })
        },res=>{
          tip.error(res.msg||"");
        })
      }
    },