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Use CSS hack technology to solve browser compatibility issues

Apr 05, 2017 am 10:55 AM
csshackcompatibilityBrowser

什么是CSS Hack?

  不同的浏览器对CSS的解析结果是不同的,因此会导致相同的CSS输出的页面效果不同,这就需要CSS Hack来解决浏览器局部的兼容性问题。而这个针对不同的浏览器写不同的CSS 代码的过程,就叫CSS Hack。

CSS Hack 形式

  CSS Hack大致有3种表现形式:CSS属性Hack、CSS选择符Hack以及IE条件注释Hack, Hack主要针对IE浏览器。

  1、属性级Hack:比如IE6能识别下划线"_"和星号" * ",IE7能识别星号" * ",但不能识别下划线"_",而firefox两个都不能认识。等等

  2、选择符级Hack:比如IE6能识别*html .class{},IE7能识别*+html .class{}或者*:first-child+html .class{}。等等

  3、IE条件注释Hack:比如针对所有IE:,针对IE6及以下版本:,这类Hack不仅对CSS生效,对写在判断语句里面的所有代码都会生效。

  注意书写顺序:一般是将识别能力强的浏览器的CSS写在后面。通常先写FF等非IE浏览器所需样式,其次写IE8所需样式,接着是IE7的,再接着才是IE6的。

常用CSS hack

  admin10000.com整理,以 color:red 将字体设置为红色为例:

/* CSS属性级Hack */
color:red;    /* 所有浏览器可识别*/
_color:red;     /*  仅IE6 识别 */
*color:red;    /*  IE6、IE7 识别 */
+color:red;    /*  IE6、IE7 识别 */
*+color:red;    /*  IE6、IE7 识别 */
[color:red;    /*  IE6、IE7 识别 */
color:red\9;    /* IE6、IE7、IE8、IE9 识别 */
color:red\0;    /* IE8、IE9 识别*/
color:red\9\0;    /* 仅IE9识别 */
color:red \0;    /* 仅IE9识别 */
color:red!important; /* IE6 不识别!important 详情参见*/
-------------------------------------------------------------
/* CSS选择符级Hack */
*html #demo { color:red;}   /*  仅IE6 识别 */
*+html #demo { color:red;}  /*  仅IE7 识别 */
body:nth-of-type(1) #demo { color:red;} /* IE9+、FF3.5+、Chrome、Safari、Opera 可以识别 */
head:first-child+body #demo { color:red; } /* IE7+、FF、Chrome、Safari、Opera 可以识别 */
:root #demo { color:red\9; } : /* 仅IE9识别 */
--------------------------------------------------------------
/* IE条件注释Hack 详情参见 */
<!--[if IE]>此处内容只有IE可见<![endif]--> 
<!--[if IE 6]>此处内容只有IE6.0可见<![endif]--> 
<!--[if IE 7]>此处内容只有IE7.0可见<![endif]--> 
<!--[if gte IE 6]> IE6以及IE6以上版本可识别 <![endif]-->
<!--[if lt IE 7]> IE7以及IE7以下版本可识别 <![endif]-->
<!--[if gte IE 7]> IE7以及IE7以上版本可识别 <![endif]-->
<!--[if !IE]>此处内容只有非IE可见<![endif]-->

  注意:css hack虽然可以解决个浏览器之间css显示的差异问题,但是毕竟不符合W3C规范,我们平时写css最好是按照标准来,这样对我们以后维护也是大有好处的,实在不行再用。

比较著名的css hack 兼容一览图:http://centricle.com/ref/css/filters/
相关文档:最全的CSS浏览器兼容问题
 

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