判断IE版本的HTML语句详解

我们常常会在网页的HTML里面看到形如[if lte IE 9]……[endif]的代码，表示的是限定某些浏览器版本才能执行的语句，那么这些判断语句的规则是什么呢？请看下文：

注意：以下用法不支持IE10和IE11

 除IE外都可识别（不是IE） 

项目	范例	说明
!		The NOT operator. This is placed immediately in front of the feature, operator, or subexpression to reverse the Boolean meaning of the expression.
lt	[if lt IE 5.5]	The less-than operator. Returns true if the first argument is less than the second argument.
lte	[if lte IE 6]	The less-than or equal operator. Returns true if the first argument is less than or equal to the second argument.
gt	[if gt IE 5]	The greater-than operator. Returns true if the first argument is greater than the second argument.
gte	[if gte IE 7]	The greater-than or equal operator. Returns true if the first argument is greater than or equal to the second argument.
( )	[if !(IE 7)]	Subexpression operators. Used in conjunction with boolean operators to create more complex expressions.
&	[if (gt IE 5)&(lt IE 7)]	The AND operator. Returns true if all subexpressions evaluate to true.
|	[if (IE 6)|(IE 7)]	The OR operator. Returns true if any of the subexpressions evaluates to true.