Javascript 闭包和 'this'

Question

我创建的对象有问题，看起来像这样:

var myObject = {

    AddChildRowEvents: function(row, p2) {
        if(document.attachEvent) {
            row.attachEvent('onclick', function(){this.DoSomething();});
        } else {
            row.addEventListener('click', function(){this.DoSomething();}, false);
        }
    },

    DoSomething: function() {
        this.SomethingElse(); //<-- Error here, object 'this' does not support this method.
    }
}

问题是，当我在“DoSomething”函数中时，“this”没有引用“myObject”，我做错了什么？

Answer 1

当函数被调用时，“this”指的是行。如果你想拥有这个对象，你可以这样做:]

AddChildRowEvents: function(row, p2) {
    var theObj = this;
    if(document.attachEvent) {
         row.attachEvent('onclick', function(){theObj.DoSomething();});
    } else {
         row.addEventListener('click', function(){theObj.DoSomething();}, false);
    }
},

当函数被调用时，它可以访问函数定义时作用域中的变量 theOBj。