IE下判断IE版本的代码语句

1.  除IE外都可识别 
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解释语句如下:

gt = selects greater than(高于)

lt = selects less than(低于)

gte = selects greater than or equal to(>=)

lte = selects less than or equal to(<=)

! = selects everything except what directly follows the "!"(选择所有,除了!)

例子:

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