document.all[]详解.doc

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）。 IEs 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）Document.All ExampleExample HeadingThis is a paragraph. It is only a paragraph.Yet another paragraph.This final paragraph has special emphasis.!-var i,origLength;origLength = document.all.length;document.write(document.all.length=+origLength+);for (i = 0; i origLength; i+)document.write(document.all+i+=+document.alli.tagName+);/-输出结果： Example Heading-This is a paragraph. 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