The internal properties of the JS function---arguments,callee,caller

in the next few articles, I'll talk about the internal properties of the function,arguments,callee,caller

(1)arguments, is a class array object, which contains all the parameters of the passed function, the main purpose is to save the parameters of the function;

Code Listing 1:

function AA (b) {alert (arguments);}

AA (4);

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function AA (a,b,c,d) {alert (arguments.length);}

AA (1,2,3,4);

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function AA (a,b,c,d) {alert (arguments[2]);}

AA (1,2,3,4);

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function Hi () {

for (var i=0; i<arguments.length; i++) {

Alert ("Hi," + arguments[i])

}

}

Hi ("Cat", "Alice");

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(2) Another property , Callee, is a pointer to the function that owns the arguments object.

(3) Another property , Calleer, that points to a reference to the function that called the current function.

Arguments.callee Typical applications:

Code 1 :

var i = 1 setTimeout (function () {

Alert (i) if (i++<3) setTimeout (Arguments.callee, 1000)

}, 1000);

Code 2 : (Implementing code decoupling when recursive)

function test1 (num) {

if (num<=1) {

Return 1

}else

Return Num*arguments.callee (num-1);

}

Test1 (5);//120

Arguments.callee.caller

Arguments.callee.caller Example:

f ();

function f () {

alert (Arguments.callee.caller); Undefined

g ();

}

Functiong () {

alert (Arguments.callee.caller);

}

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This chapter is a brief introduction to this, following a few articles, will introduce the function of the most important attributes (no one),prototype and very good two methods, Apply,call (), the level is limited, please give me a lot of advice.

This article is from the "7439523" blog, please be sure to keep this source http://7449523.blog.51cto.com/7439523/1427110