Html 判断IE版本
同时,有人会试图使用 除IE外都可识别
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Ite:less than or equal to意思是小于或等于IE6浏览器,用于IE浏览器的条件注释,常用于CSShack,针对IE的JS等。
在进行WEB标准网页的学习和应用过程中,网页对浏览器的兼容性是经常接触到的一个问题。其中因微软公司的Internet Explorer(简称IE)占据浏览器市场的大半江山,此外还有Firefox、Opera等。需要对这些浏览器进行兼容。
同时,单就IE而言,因IE版本的升级更替,目前浏览者使用的主要停留在 IE5(IE5.5)、IE6和IE7这三个版本中。而这3个版本对于我们制作的WEB标准网页(XHTML+CSS)解释执行的显示状况不尽相同。并 且,其他非IE浏览器与IE对某些CSS解释也不一样。所以,通过IE浏览器中的专有条件注释可有针对性的进行相关属性的定义。
条件注释只能用于Explorer 5+ Windows(以下简称IE)(条件注释从IE5开始被支持)。如果你安装了多个IE,条件注释(Conditional comments)将会以最高版本的IE为标准(目前为IE 7)。
条件注释只能在windows Internet Explorer(以下简称IE)下使用,因此我们可以通过条件注释来为IE添加特别的指令。
通俗点,条件注释就是一些if判断,但这些判断不是在脚本里执行的,而是直接在html代码里执行的,比如:
1,条件注释的基本结构和HTML的注释()是一样的。因此IE以外的浏览器将会把它们看作是普通的注释而完全忽略它们。
2,IE将会根据if条件来判断是否如解析普通的页面内容一样解析条件注释里的内容。
3,条件注释使用的是HTML的注释结构,因此他们只能使用在HTML文件里,而不能在CSS文件中使用。
可使用如下代码检测当前IE浏览器的版本(注意:在非IE浏览器中是看不到效果的)
那如果当前的浏览器是IE,但版本比IE5还低,该怎么办呢,可以使用
这其中就区分了IE7和IE6向下的浏览器对CSS的执行,达到兼容的目的。同时,首行默认的css.css还能与其他非IE浏览器实现兼容。
注意:默认的CSS样式应该位于HTML文档的首行,进行条件注释判断的所有内容必须位于该默认样式之后。
比如如下代码,在IE浏览器下执行显示为红色,而在非IE浏览器下显示为黑色。如果把条件注释判断放在首行,则不能实现。该例题很能说明网页对IE浏览器和非IE浏览器间的兼容性问题解决。
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