1
、理解document.all
[]
从IE4开始IE的object
model才增加了document.all
[],来看看document.all
[]的Description:
Array
of all HTML tags in the document.Collection of all elements contained by the
object.
也就是说document.all
[]是文档中所有标签组成的一个数组变量，包括了文档对象中所有元素（见例1）。
IE’s
document.all
collection exposes all document elements.This array provides access to every
element in the document.
document.all
[]这个数组可以访问文档中所有元素。
例1（这个可以让你理解文档中哪些是对象）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML
1.0
Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html
xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Document.All
Example</title>
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1" />
</head>
<body>
<h1>Example
Heading</h1>
<hr />
<p>This is a
<em>paragraph</em>. It is only a
<em>paragraph.</em></p>
<p>Yet another
<em>paragraph.</em></p>
<p>This final
<em>paragraph</em> has <em id="special">special
emphasis.</em></p>
<hr />
<script
type="text/javascript">
<!--
var i,origLength;
origLength =
document.all
.length;
document.write('document.all
.length='+origLength+"<br
/>");
for (i = 0; i < origLength;
i++)
{
document.write("document.all
["+i+"]="+document.all
[i].tagName+"<br
/>");
}
//-->
</script>
</body>
</html>
输出结果：
Example Heading
This is a paragraph
. It is only a paragraph.
Yet another paragraph.
This final paragraph
has special
emphasis.
< type="text/javascript">
<!--
var i,origLength;
origLength = document
