终于找到一个用 rxjs 的场景

websocket，如果直接写的话，各种 onmessage onopen 处理代码写的比较恶心

另外，写个 onclose onerror 重连，里面清理一下状态，那代码就无可避免很多上下文变量

而用 rxjs 就比较省心

const subject = webSocket('ws://localhost:8081');

subject.pipe(retry(10)
).subscribe({next: msg => console.log('message received:' + msg), // Called whenever there is a message from the server.
  error: err => {console.log("err", err)
  }, 
  complete: () => console.log('complete') // Called when connection is closed (for whatever reason).
 });
}

断了重连 10 次，比较省心。