1 var connection = new signalR.HubConnectionBuilder() 
2         .withUrl("http://localhost:5000/doopstream") 
3         //重连函数，参数是重连间隔时间，单位毫秒
4         .withAutomaticReconnect([0, 3000, 5000, 10000, 15000, 30000])
5         .configureLogging(signalR.LogLevel.Information)
6         .build();

 1 //启动模块
 2     async function start(){ 
 3         connection.start().then(()=>getdata()).catch(err => {
 4         var msg="strat:"+err.toString();
 5         console.error(msg);
 6         setTimeout(()=>start(),5000);
 7     });
 8     }
 9     //触发启动
10    start();

1 //重连成功后的处理机制
2     connection.onreconnected((connectionId)=>{
3         
4         console.log("onreconnected:"+connectionId);
5         getdata();
6     });

1 //连接关闭后的处理机制
2     connection.onclose(async (error)=>{
3         var msg="close:"+error.toString();
4         console.error(msg);
5          await start();
6     });

 1 /接收数据逻辑
 2 function getdata() {
 3         console.log("connected");
 4         connection.invoke("Subscribe", ‘test‘).catch(err => console.error(err.toString()));
 5         connection.on("Receive", function (ch, message) {
 6             console.log(message);
 7             var p = document.createElement("p");
 8             p.innerHTML = ch + ‘#‘ + message;
 9             var div = document.getElementById("div");
10             div.appendChild(p);
11         }); 
12     };