JavaScript“this”引用错误的对象 [英] JavaScript "this" references wrong object

问题描述

好吧， 这个 并没有真正引用错误的对象，但我不知道如何引用正确的对象。

Well, this doesn't really refer to the wrong object, but I do not know how to refer to the correct one.

function someObj() {
   this.someMethod1 = function() {
      var elementBtn = document.getElementById('myBtn');
      elementBtn.onclick = function() { 
         this.someMethod2(); //I want this.someMethod2() to be called
         //...but it tries to call elementBtn.someMethod2() i believe.
      };
   };
   this.someMethod2 = function() {
      alert('OK');
   };
}

所以当我的 myBtn 我想要 someObj.someMethod2（） 来运行。我希望它是 someObj ，而不是任何其他 someObj 。但是如何？！

So when my myBtn is clicked I want someObj.someMethod2() to run. And I want it to be that someObj, not any other someObj. But how?!

推荐答案

您可能需要进行如下调整：

You might need to make a tweak like this:

function someObj() {
    var that = this;

    this.someMethod1 = function() {
        var elementBtn = document.getElementById('myBtn');
        elementBtn.onclick = function() { 
            that.someMethod2();
        };
    };
    this.someMethod2 = function() {
       alert('OK');
    };
}

that捕获你所追求的范围。

"that" captures the scope you are after.

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