Question

我有这样的目的:

function ImageHolder(Attributes, Parent)
{
    this.Id = Attributes[ Id ];
    this.Parent = Parent;

    this.Element = $( <div/> );

        this.msg = "hello world";

    this.Parent.append(this.Element);


    this.handleDrop = function(e, ui)
    {
        alert(this.msg);

    };

    this.Element.droppable({drop: this.handleDrop});
}

于是,我就提出这样一个目标:

holder = new ImageHolder(A,B);

但是,当我试图把一些东西推向要素时,我发现这一错误:

this.msg is undefined

我在这里做了一些错误的事情?

Answer 1

a. 提供副本;

var thisCopy = this;

之后改为......

this.handleDrop = function(e, ui)
{
    alert(thisCopy.msg);

};

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