getAttribute for IE7

getAttribute 

大部分介绍都说只有一个，包括w3cschool！

其实这个方法在iE7下有两个参数！

msdn 上查到的！

简单翻一下
0 是默认情况，不区分大小写！
1 区分大小写

2 返回字符串，这个加不加我没发现有什么区别！

4仅对url有效！比如属性的值为/posetedit/31234,加上这个参数会加上域名，自动补全url，变为http://xxx.com//posetedit/31234

注：这些其实只针对ie7（包括IE7）以前的版本

源文档：

Syntax

object. getAttribute(strAttributeName, lFlags)

Parameters

strAttributeName [in]

Type: String

String that specifies the name of the attribute.

lFlags [in, optional]

Type: Integer

Integer that specifies one or more of the following flags:

0

Default. Performs a property search that is not case-sensitive, and returns an interpolated value if the property is found.

1

Performs a case-sensitive property search. To find a match, the uppercase and lowercase letters in strAttributeName must exactly match those in the attribute name.

2

Returns attribute value as a String. This flag does not work for event properties.

4

Returns attribute value as a fully expanded URL. Only works for URL attributes.

Return value

Type: Variant

Variant that returns a String, Variant of type Integer, or Boolean value as defined by the attribute. If the attribute is not present, this method returns null.

msdn：http://msdn.microsoft.com/en-us/library/ms536429(VS.85).aspx