在data中定义好需要用到的变量

// 消息类
class MsgContent {
    constructor(param = {},action = 'heartbeat',controller = 'Index'){
        this.param = param;
        this.action = action;
        this.controller = controller;
    }
}

isSocketClose:false,    // 是否关闭socket
reconnectCount:5,       // 重连次数
heartbeatInterval:"",   // 心跳定时器
isStart:false,          // 是否启动设备

在methods中

sokcet(){
                try{
                    //WebSocket的地址
                    var url = this.$getUniAppConfig().xhr.socket
                    // 连接
                    uni.connectSocket({
                        url: url,
                        fail:(err)=>{
                            _this.$toast(JSON.stringify(err))
                        }
                    });
                    // 连接打开
                    uni.onSocketOpen(function (res) {
                        console.log('WebSocket打开'); 
                        //断线后重连几次
                        _this.reconnectCount = 5
                        // 5秒发送一次心跳
                        _this.heartbeatInterval = setInterval(()=>{
                            _this.sendMsg(new MsgContent({
                                name:'PING',
                                id:_this.equipmentData.id
                            }))
                        },5000)
                    });
                    // 监听连接失败
                    uni.onSocketError(function (res) {
                      console.log('WebSocket连接打开失败，请检查！');
                   //停止发送心跳
                      clearInterval(_this.heartbeatInterval)
                  //如果不是人为关闭的话，进行重连
                      if(!_this.isSocketClose){
                        reconnect(url)
                      }
                    });
                    // 监听连接关闭
                    uni.onSocketClose(function (e) {
                        console.log('WebSocket连接关闭！');
                        clearInterval(_this.heartbeatInterval)
                        if(!_this.isSocketClose){
                            reconnect(url)
                        }
                    });
                    // 监听收到信息
                    uni.onSocketMessage(function (res) {
                        uni.hideLoading()
                        let serverData = JSON.parse(res.data)
                    //与后端规定好返回值分别代表什么，写业务逻辑
                    
                    //判断是否为同一设备，比如用户去链接了其他设备，避免设备链接混淆
                        if(_this.equipmentId== serverData.data.user_equipment_type_id) {
                            if(serverData.code == 0) {
                             ...
                            }else if(serverData.code == 1){ 
                             ...
                          });
                    
                    const reconnect = this.$debounce((url) =>{  // 断线重连
                        console.log(`第${5-this.reconnectCount}次断线重连中...`)
                        this.reconnectCount --
                        if(this.reconnectCount <= 0){
                            this.$toast("error")
                           //如果重连次数为0，则做退出处理
                            uni.navigateBack({
                                delta:1
                            })
                        }else{
                            // 连接
                            uni.connectSocket({
                                url: url,
                            });
                        }
                        
                    },3000)
                }catch(e){
                    
                }
            }

    sendMsg(msg){   //向后端发送命令
                msg = JSON.stringify(msg)
                try{
                    //通过 WebSocket 连接发送数据
                    uni.sendSocketMessage({
                        data: msg
                    });
                }catch(e){
                    this.isSocketClose = true;
                    uni.closeSocket()
                }
            },
        

    Tapstart(){ // 启动
                uni.showLoading({
                    title:'设备启动中...'
                })
                this.sendMsg(new MsgContent({
                 //启动设备需要的请求参数
                    id:_this.equipmentData.id,
                    equipment_status:_this.equipmentData.equipment_status,
                    uid:_this.equipmentData.uid
                },"start_equipment"))
            },