会话的详细接口，请参考：[《监听与会话》](/article/718)

### 1、单服务端时


```javascript
const sessoin = await SocketD.createClient("sd:ws://127.0.0.1:8602")
        .listen(SocketD.newEventListener().doOn("hello", (s, m) => {
            console.log(m);
        }))
        .open();
```

### 2、多服务端时，使用集群客户端


```javascript
const sessoin = await SocketD.createClusterClient("sd:ws://127.0.0.1:8602", 
                            "sd:ws://127.0.0.1:8603", 
                            "sd:ws://127.0.0.1:8604")
        .listen(SocketD.newEventListener().doOn("hello", (s, m) => {
            console.log(m);
        }))
        .open();
```