The arguments of JavaScript

Javascrip China each function will have a arguments object instance arguments, which references the arguments to the function, and can refer to the arguments element in the form of an array subscript "[]". Arguments.length is the number of function arguments, and Arguments.callee refers to the function itself.

Arguments his features and how to use them

Characteristics:

Arguments objects and function are inseparable. Because the arguments object cannot be created explicitly, the arguments object is available only when the function is started.

How to use:

Although the arguments object is not an array, accessing a single parameter is the same way you access an array element

For example:

arguments [0],arguments[1],。。。。。。。。 arguments [N],

In JS, you do not need to explicitly specify the parameter names, you can access them, for example:

function Test () {        var s = "";          for (var i = 0; i < arguments.length; i++) {            alert (arguments[i]);             + = Arguments[i] + ","        ;        } return s;    } Test ("name", "Age")

Output Result:

Name,age

Let's take a look at the Callee property and return theFunctionObject
function  the body of the object. The callee   property is a member of the   arguments  object and is available only if the related function is executing.
< Span class= "pun" >< span class= "str" >< Span class= "PLN" >< Span class= "PLN" > callee   The initial value of the property is the   that is being executed; function  object, which allows anonymous recursive functions.

var function (n) {        if (1 = = N)            {return 1;         Else {            return n + arguments.callee (n-1);        }    }    Alert (SUM (6));

Output Result:

21st

The popular point is that arguments This object is used mostly for multiple calls to the same method and for different number of passes. According to < Span class= "pun" >< span class= "str" >< Span class= "PLN" >< Span class= "PLN" > arguments index to determine the method of execution

JavaScript arguments