看了網(wǎng)上的一篇文章<<全面理解javascript的caller,callee,call,apply概念>>,記下代碼,備用
<script?language="JavaScript">
/*
?*?演示arguments的用法,如何獲取實參數(shù)和形數(shù)數(shù)
?*/
function?argTest(a,b,c,d){
????var?numargs?=?arguments.length;?????//?獲取被傳遞參數(shù)的數(shù)值。
????var?expargs?=?argTest.length;???????//?獲取期望參數(shù)的數(shù)值。
????alert("實參數(shù)目為:"+numargs)
????alert("形數(shù)數(shù)目為:"+expargs)

????alert(arguments[0])?????????
????alert(argTest[0])??????????//undefined?沒有這種用法
}
//argTest(1,2)
//argTest(1,2,3,4,5)

/*
?*??arguments不是數(shù)組(Array類)
?*/

Array.prototype.selfvalue?=?1;
function?testAguments(){
????alert("arguments.selfvalue="+arguments.selfvalue);
}
//alert("Array.sefvalue="+new?Array().selfvalue);
//testAguments();





/*
?*?演示函數(shù)的caller屬性.
?*?說明:(當前函數(shù)).caller:返回一個對函數(shù)的引用，該函數(shù)調(diào)用了當前函數(shù)
?*/

function?callerDemo()?{
????if?(callerDemo.caller)?{
????????var?a=?callerDemo.caller.arguments[0];
????????alert(a);
????}?else?{
????????alert("this?is?a?top?function");
????}
}
function?handleCaller()?{
????callerDemo();
}

//callerDemo();
//handleCaller("參數(shù)1","參數(shù)2");


/*
?*?演示函數(shù)的callee屬性.
?*?說明:arguments.callee:初始值就是正被執(zhí)行的?Function?對象,用于匿名函數(shù)
?*/
function?calleeDemo()?{
????alert(arguments.callee);
}
//calleeDemo();
//(function(arg0,arg1){alert("形數(shù)數(shù)目為:"+arguments.callee.length)})();


/*
?*?演示apply,call函數(shù)的用法
?*?說明:作用都是將函數(shù)綁定到另外一個對象上去運行，兩者僅在定義參數(shù)方式有所區(qū)別：
?*???????apply(thisArg,argArray);
?*?????call(thisArg[,arg1,arg2…]?]);
?*?????即所有函數(shù)內(nèi)部的this指針都會被賦值為thisArg
?*/

?function?ObjectA(){
????alert("執(zhí)行ObjectA()");
????alert(arguments[0]);
????this.hit=function(msg){alert(msg)}
????this.info="我來自ObjectA"
?}
?
?function?ObjectB(){
????alert("執(zhí)行ObjectB()");
????//調(diào)用ObjectA()方法,同時ObjectA構造函數(shù)中的所有this就會被ObjectB中的this替代
????ObjectA.apply(this,arguments);//ObjectA.call(this);
????alert(this.info);
?}
?//ObjectB('參數(shù)0');


?var?value="global?變量";
?function?Obj(){
????this.value="對象！";
?}
?function?Fun1(){
????alert(this.value);
?}
?//Fun1();
?//Fun1.apply(window);?
?//Fun1.apply(new?Obj());?
</script>