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2010-05-26T08:24:46Z

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в 18:52, 25 мая 2010

2010-05-25T18:52:56Z

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== Accessing Function Arguments with the arguments Array==

<p>It is possible to access the arguments as an array.</p>



<source lang="javascript">
<html>
<SCRIPT LANGUAGE="JavaScript1.2">

</SCRIPT>
</html></source>

== arguments==

<p>Syntax</p>



<source lang="javascript">
arguments
arguments[index]</source>

<p>The Arguments object is an array that contains all the arguments passed into the function.</p>
<p>The Arguments object is automatically created and initialized when a function is invoked.</p>
<p>The Arguments object goes out of scope when the code function finishes executing.</p>
<p>To access arguments passed into a function, simply use array brackets to specify an index.</p>
<p>Properties Associated with the Arguments Object is listed in the following table.</p>
Property
Description
callee
Contains the function that is currently executing
caller
Contains the Arguments object of the calling function
length
The length of the arguments array

== arguments.callee==

<p>The callee property contains the function that is currently executing.</p>
<p>This is useful if the function has no name.</p>



<source lang="javascript">
<html>
<form>
<input type="button" value="A" OnClick=myFunction(this,"A")>
<input type="button" value="B" OnClick=myFunction(this,"B")>
<input type="button" value="C" OnClick=myFunction(this,"C")>
<input type="button" value="D" OnClick=myFunction(this,"D")>
<input type="button" value="E" OnClick=myFunction(this,"E")>
</form>
<script language="JavaScript">

</script>
</html></source>

== arguments.caller==

<p>The caller property contains the Arguments object of the calling function.</p>
<p>If the given function was not executed from another function, arguments.caller is null.</p>



<source lang="javascript">
<html>
<form>
<input type="button" value="A" OnClick=myFunction(this,"A")>
<input type="button" value="B" OnClick=myFunction(this,"B")>
<input type="button" value="C" OnClick=myFunction(this,"C")>
<input type="button" value="D" OnClick=myFunction(this,"D")>
<input type="button" value="E" OnClick=myFunction(this,"E")>
</form>
<script language="JavaScript">

</script>
</html></source>

== arguments.length==

<p>The length property contains the number of arguments that were passed into the function.</p>
<p>This number matches the number of elements in the arguments array associated with the Argument object.</p>



<source lang="javascript">
<html>
<form>
<input type="button" value="A" OnClick=myFunction(this,"A","B","C")>
<input type="button" value="B" OnClick=myFunction(this,"D","E")>
<input type="button" value="C" OnClick=myFunction(this,"F")>
<input type="button" value="D" OnClick=myFunction(this,"G","H")>
<input type="button" value="E" OnClick=myFunction(this,"I")>
</form>
<script language="JavaScript">

</script>
</html></source>

== Get function parameter length==



<source lang="javascript">
<html>
<head>
<title>Try Catch Example</title>
<script type="text/javascript">
function addTwoNumbers(a, b) {
alert(arguments.length);
}
var result = addTwoNumbers(90);
</script>
</head>
<body>
</body>
</html></source>

== Use arguments.callee.toString() to get the source of the function==



<source lang="javascript">
<html>
<form>
<input type="button" value="A" OnClick=displayFood(this,"A")>
<input type="button" value="B" OnClick=displayFood(this,"B")>
<input type="button" value="C" OnClick=displayFood(this,"C")>
<input type="button" value="D" OnClick=displayFood(this,"D")>
<input type="button" value="E" OnClick=displayFood(this,"E")>
</form>
<script language="JavaScript">

</script>
</html></source>

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Admin: 1 версия

в 18:52, 25 мая 2010