javascript - 获取对象内部的正确函数

Question

在此代码中，第 15 行 “this”指针指的是套接字而不是我的对象网络。我应该怎么做才能真正获取网络对象？很抱歉这个“菜鸟”问题，但我在谷歌上搜索了一段时间，我什至不知道该输入什么来找到答案。

var Network = function(ip, port){
  this.host = "ws://"+ip+":"+port;
  this.socket = new WebSocket(this.host);
  this.socket.binaryType = "arraybuffer";
  var ByteBuffer = dcodeIO.ByteBuffer;

  this.socket.onopen = function(){
    console.log('Connected to the WebSocket server');
  };

  this.socket.onmessage = function(e){
    var bytearray = new Uint8Array(e.data);
    switch(bytearray[0])
    {
    case 2: this.handleLoginAnswer(bytearray); break; //line 15 
    default:
      alert("received a wrong packet")
    }
  };

  this.handleLoginAnswer = function(packet){
    var bytearray = new Uint8Array(e.data);
    var reader = ByteBuffer.wrap(bytearray);
    var opcode = reader.readUint8();

    if(opcode != 2)
      return;

    var result = reader.readUint8();
    switch(result){
      case 1: displayValidate("Sucessfully registered"); break;
      case 2: displayError("Username is already taken"); break;
      case 3: displayError("Email is already taken"); break;
    }

    function displayValidate(message){
      $("#register-messagebox").html("<div class=\"alert-message\" style=\"background-color:#27ae60;\">" + message + "</div>");
    }

    function displayError(error){
      $("#register-messagebox").html("<div class=\"alert-message\" style=\"background-color:#e74c3c;\">" + error + "</div>");
    }
  }
}

Answer 1

放置:

var self = this;  // or other name to suit

当您需要该对象时，请参阅self。