手机浏览器熄屏后不能继续发送心跳，或者有什么办法亮屏后重连继续发送心跳

电脑浏览器上没问题，但是手机上一旦锁屏后，就会停止发送心跳，然后就与服务器断开

        <script>
            var fromid = 98;
            var count = 1;
            var toid = 1484553;
            var ws =  new WebSocket("ws://esp8266.b.com:8282");
            ws.onopen = function(){
                setInterval(show,10000);//心跳发送
             }
            ws.onmessage = function(e){
            var message =  eval("("+e.data+")");
             console.log(message);
                switch (message.type){
              case "init":
                  var bild = '{"type":"bind","fromid":"'+fromid+'"}';
                   ws.send(bild);
                  return;
                }
            }

            mui.init({
                swipeBack:true //启用右滑关闭功能
            });
            var isActive = document.getElementById("mySwitch").classList.contains("mui-active");
            if(isActive){
              console.log("打开状态");
            }else{
              console.log("关闭状态");  
            }
            document.getElementById("mySwitch").addEventListener("toggle",function(event){
              if(event.detail.isActive){
                console.log("你启动了开关");
                var message = '{"data":"on","type":"say","fromid":"'+fromid+'","toid":"'+toid+'"}';
                ws.send(message);

              }else{
                console.log("你关闭了开关");
                var message = '{"data":"off","type":"say","fromid":"'+fromid+'","toid":"'+toid+'"}';
                ws.send(message);   
              }

            })
            function show(){
                 ws.send('{"type":"pong"}');
            }

        </script>