signalR

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创建连接

const connection = new signalR.HubConnectionBuilder()
    .withUrl("/chatHub")
    .configureLogging(signalR.LogLevel.Information)
    .build();

connection.start().then(function () {
    console.log("connected");
});

发送消息

connection.invoke("SendMessage", user, message)
.then(d => console.log(d.msg))
.catch(err => console.error(err.toString()));

监听事件

connection.on("ReceiveMessage", (user, message) => {
 ...
});

重连

async function start() {
    try {
        await connection.start();
        console.log("connected");
    } catch (err) {
        console.log(err);
        setTimeout(() => start(), 5000);
    }
};

connection.onclose(async () => {
    await start();
});