如何作用于回调函数

Question

我有一个使用 WebSocket 连接到服务器的脚本

export class AppComponent {

  connection_status = false;
  message = '';

  public connect() {
    this.socket = io('http://localhost:5001');
    this.socket.on('connected', this.connection_established);
  }
}

我想在收到connected 消息时更改connection_status 变量并将消息内容保存到message 变量。

Answer 1

export class AppComponent {

  connection_status = false;
  message = '';

  public connect() {
    this.socket = io('http://localhost:5001');
    this.socket.on('connected', this.connection_established.bind(this));
  }

  connection_established() {
    this.connection_established = true;
    this.message = 'connected';
  }
}