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。
