js中Function的apply方法与call方法理解

　　最近在使用jQuery的$.each方法时很，突然想到$.each($('div'),function(index,entity){});中的这个index和entity是哪冒出来的，而且可有可无的，而且这么高大上的能告诉我们当前遍历的下标和实例。所以看了一下jQuery源代码，是这么写的：

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" alt="" />

调试的时候走的是标红的这段代码，然后用到了callback.call这个函数，于是翻看了一下《js高级程序设计》，其中有比较深的解释。

首先，function是一个指向Function对象，函数名是一个指向函数的指针。那么在函数体内，就会有一个作用域，即this关键字。

this关键字指的是函数运行的作用域，举个例子来说，

<script type="text/javascript">
        function funcA() {
            alert(this);
            alert("Function A");
        }
</script>

上面这段代码中的函数funcA定义在全局环境中，那么函数体内的this即window对象。

下面该到call和apply的说明了。以call函数为例，call的第一个参数，就是改变函数的作用域，后面的参数为传入函数的所需的参数，必须与原函数的参数一直，举例说明：

<script type="text/javascript">
        var testO = { name: "Lily" };
        function funcA(a,b) {
            alert(this);
            alert("Function A");
        }

        function funcB(a, b) {
            funcA.call(testO, a, b);
        }

        funcB(1,2);  //this变成了testO
    </script>

我们定义funcB函数的中，调用了funcA的call函数，这个时候我们改变了funcA中this的指向，原本指向window的，现在指向了call的第一个参数testO这个对象。而且调用call时，因为funcA函数有两个参数，所以如果要想funcA传递参数，必须一一指出参数，即后面的两个参数a和b，或者可以只穿第一个参数

即：funcA.call(testO)；或者只传a，即：funcA.call(testO,a);

而apply与call的区别仅在于，apply的第二个参数可以是数组形式，而且不必一一指出参数，funcA.apply(testO,[a,b])

介绍完call与apply的基本用法，该说说他哥俩真正的用武之地了，扩充函数赖以运行的作用域。

<script type="text/javascript">
        window.color = "透明";
        var testObj = { color: "红色" };

        function testFuc() {
            alert(this.color);
        }

        $(function () {
            1.testFuc(); //弹出“透明”
            2.testFuc(this); //弹出“undefined”
            3.testFuc.call(this.parent); //弹出“透明”
            4.testFuc.call(window); //弹出“透明”
            5.testFuc.call(testObj); //弹出“红色”
        });
</script>

上面这段代码演示了call的作用。第一个函数调用，this指向了window，所以弹出了window的color属性。

第二个函数可能有些朋友以为也会弹出透明，但是请先确定我们的函数运行在$(function(){});中，这个jQuery的函数，了解jQuery的朋友都很清楚，在

$(function(){});中this的作用域指向的是document，然后我们调用testFunc，要弹出document的color，当然是未定义的。

第三个函数将testFunc的this指向了document的亲爹window，弹出window的color当然也是没有问题的。

第四个函数就更加直白了，把window传进去了

第五个函数，将testFunc的this指向了testObj，弹出了红色。

讲到这里，用法大家应该都有所了解了，但是具体怎么去理解怎么去使用还是看自己的套路。

我是这么理解的，可以把这种用法看成是C#或者java中的泛型方法。比如一个C#方法的定义

public void Test<T>(T a, T b) { }

这样我们就可以实现对方法的扩展，实现通用的目的。

以上都是本人自己的看法和观点，有什么不对之处还请大家指出来共同学习。