JavaScript 作用域问题

Question

作为一个试图对我的 javascript 编程采用更面向对象的方法的人，我遇到了一个绊脚石，我确信这可能是非常基本的东西，但是，采用以下对象实现(假设 jQuery 对象可用于此代码):

function Foo()
{
    this.someProperty = 5;
}

Foo.prototype.myFunc = function()
{
    //do stuff...
};

Foo.prototype.bar = function()
{
    //here 'this' refers to the object Foo
    console.log(this.someProperty);

    $('.some_elements').each(function()
    {
        //but here, 'this' refers to the current DOM element of the list of elements
        //selected by the jQuery selector that jquery's each() function is iterating through
        console.log(this);

        //so, how can i access the Foo object's properties from here so i can do
        //something like this?
        this.myFunc();
    });
};

Answer 1

您可以暂时使用另一个变量来指向正确的this:

Foo.prototype.bar = function()
{
    //here 'this' refers to the object Foo
    console.log(this.someProperty);

    var self = this;

    $('.some_elements').each(function()
    {
        self.myFunc();
    });
};