javaScript from object 无法访问对象变量

Question

我正在使用 jquery .get 函数

我无法使用对象访问对象变量 javascript 代码如下

function cons1(x){

 this.x = ++x || false;
 this.objectarray1 = [];
 
 if(this.x){
  alert('x has value');
 }
}
cons1.prototype.profun1 = function(){

 alert(this.objectarray1[0]);
 
 $.get('requesting url',{'parameters'},function(data){

  this.objectarray1[0] = this.x;// <-- can place a value
    alert(this.objectarray1[0]);// <-- alerts this.x value
 }.bind(this));
}

var x=1;

var obj1 = new cons1(x);
obj1.profun1();
var y = obj1.objectarray1[0];
alert(y);// <-- gives undefined on screen

Answer 1

原代码：

function cons1(x){

 this.x = ++x || false;
 this.objectarray1 = [];
 
 if(this.x){
  alert('x has value');
 }
}
cons1.prototype.profun1 = function(){

 alert(this.objectarray1[0]);
 
 $.get('requesting url',{'parameters'},function(data){

  this.objectarray1[0] = this.x;// <-- can place a value
    alert(this.objectarray1[0]);// <-- alerts this.x value
 }.bind(this));
}

var x=1;

var obj1 = new cons1(x);
obj1.profun1();
var y = obj1.objectarray1[0];
alert(y);// <-- gives undefined on screen

转换为：

function cons1(x){

 this.x = ++x || false;
 this.objectarray1 = [];
 
 if(this.x){
  alert('x has value');
 }
}
cons1.prototype.profun1 = function(){

 alert(this.objectarray1[0]);
 
  $.ajax({// <-- converted to ajax run sync
    url:'requesting url',
    data:{'parameters'},
    async : false,
    success:function(data){
    this.objectarray1[0] = this.x;// <-- can place a value
      alert(this.objectarray1[0]);// <-- alerts this.x value
   }.bind(this)
  });
}

var x=1;

var obj1 = new cons1(x);
obj1.profun1();
var y = obj1.objectarray1[0];
alert(y);// <-- now gives value