javascript - 我如何在 javascript 回调中获得对“this”的期望引用

Question

我有套接字连接，我正在尝试从不同的类订阅这个 onMessage 函数，以便我可以获取该特定类中的消息，但我无法在下面的代码中的processTicks函数中调用test()片段。请帮忙。谢谢

class SocketClient {
  this._ws.onmessage = (msg) => {
    for (var i = this._handlers.length - 1; i >= 0; i--) {
      this._handlers[i](msg);
    }
  };
  setHandler(callback) {
    this._handlers.push(callback)
  }
}

class SomeOtherClass {

  test() {

  }


  processTicks(ticks) {
    try {
      this.test() //this is not working
      // how do i get the correct this here,
      // so that i can call some function inside this class

    } catch (err) {
      console.log(err)
    }
  }

  registerListner() {
    socketClient.setHandler(this.processTicks);
  }
}