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深入剖析CSS层叠与继承的使用

你对CSS层叠和继承的概念和用法你是否熟悉,这里和大家分享一下,文档中的一个元素可能同时被多个CSS选择器选中,每个选择器都有一些CSS规则,这就是层叠,而所谓继承,就是父元素的规则也会适用于子元素。

创新互联成立十载来,这条路我们正越走越好,积累了技术与客户资源,形成了良好的口碑。为客户提供成都做网站、网站建设、网站策划、网页设计、域名注册、网络营销、VI设计、网站改版、漏洞修补等服务。网站是否美观、功能强大、用户体验好、性价比高、打开快等等,这些对于网站建设都非常重要,创新互联通过对建站技术性的掌握、对创意设计的研究为客户提供一站式互联网解决方案,携手广大客户,共同发展进步。

CSS技术理论:CSS层叠与继承

一、CSS层叠

我们知道文档中的一个元素可能同时被多个CSS选择器选中,每个选择器都有一些CSS规则,这就是CSS层叠。这些规则有可能不矛盾的,自然这些规则将会同时起效,然而有些规则是相互冲突的,例如:

 Example Source Code

 
 
 
  1.  
  2.  
  3.     CSS Cascade title> </li> <li>    <style type="text/CSS"> </li> <li>    h1{color:Red;}  </li> <li>    body h1{color:Blue;}  </li> <li>     style> </li> <li> head> </li> <li><body> </li> <li><h1>Hello 52CSS.com h1> </li> <li> body> </li> <li> html> </li> <li> </li> </ol></pre><p>   为此需要为每条规则制定特殊性,当发生冲突的时候必须选出一条***特殊性的规则来应用。CSS规则的特殊性可以用4个整数来表示,例如0,0,0,0.计算规则如下:</p><p>◆对于规则中的每个ID选择符,特殊性加0,1,0,0</p><p>◆对于规则中每个类选择符和属性选择符以及伪类,特殊性加0,0,1,0</p><p>◆对于规则中的每个元素名或者伪元素,特殊性加0,0,0,1</p><p>◆对于通配符,特殊性加0,0,0,0.</p><p>◆对于内联规则,特殊性加 1,0,0,0</p><p>最终得到结果就是这个规则的特殊性。两个特殊性的比较类似字符串大小的比较,是从左往右依次比较,***个数字大的规则的特殊性高。上例中两条规则的特殊性分别是0,0,0,1 和 0,0,0,2,显然第二条胜出,因此最终字是蓝色的。<br />  注意,通配符的特殊性0,0,0,0看起来没有作用,实际上不是,还有一种没有特殊性的规则,0,0,0,0要比没有特殊性更特殊,下面会介绍。</p><p>CSS还有一个!important标签,用来改变CSS规则的特殊性。实际上,在解析CSS规则特殊性的时候,是将具有!important的规则和没有此标签的规则利用上述方法分别计算特殊性,分别选出特殊性***的规则。最终合并的时候,具有任何特殊性的带有!important标记的规则胜出。#p#</p><p><strong>二、CSS继承</strong></p><p>所谓CSS继承,就是父元素的规则也会适用于子元素。比如给body设置为color:Red;那么他内部的元素如果没有其他的规则设置,也都会变成红色。CSS继承得来的规则没有特殊性。下面看一个简单的例子:</p><p> Example Source Code</p><pre> <ol> <li><html xmlns="http://www.w3.org/1999/xhtml"> </li> <li><head> </li> <li>    <title>CSS Cascade title> </li> <li>    <style type="text/CSS">   </li> <li>     *{color:Blue;}  </li> <li>     div{color:Black;}  </li> <li>     .imp{color:Red !important;}  </li> <li>     #content{color:Green;}     </li> <li>     style> </li> <li> head> </li> <li><body> </li> <li> <div>Hello <span>52CSS.com span>  div> </li> <li> <div id="content"> </li> <li>    <p class="imp">Title p> </li> <li>    Content Goes Here.  </li> <li>  div> </li> <li> body> </li> <li> html>   </li> </ol></pre><p>注意,***行的CSS并没有继承div的黑色,这是因为通配符的缘故。通配符的特殊性虽然是全0,但是还是比继承的特殊性要高。第二行展示了!important标记的作用。<br />  另外,一些明显不应该继承的属性,比如border,margin,padding之类的是不会被CSS继承的,具体可以参考CSS手册。</p><p><strong>三、其他</strong></p><p>虽然有4个整数来表示一个特殊性,仍然有可能出现两条冲突的规则的特殊性完全一致的情况,此时就按照CSS规则出现的顺序来确定,在样式表中***一个出现的规则胜出。一般不会出现这样的情况,只有一个情况例外,考虑如下样式表:</p><p> Example Source Code</p><pre> <ol> <li>:active{color:Red;}  </li> <li>:hover{color:Blue;}  </li> <li>:visited{color:Purple;}  </li> <li>:link{color:Green;}      </li> <li> </li> </ol></pre><p>这样页面中的链接永远也不会显示红色和蓝色,因为一个链接要么被访问过,要么没有被访问过。而这两条规则在***,因此总会胜出。如果改成这样:</p><p> Example Source Code</p><pre> <ol> <li>:link{color:Green;}    </li> <li>:visited{color:Purple;}  </li> <li>:hover{color:Blue;}  </li> <li>:active{color:Red;}  </li> <li> </li> </ol></pre><p>就能实现鼠标悬停和点击的瞬间变色的效果。这样的顺序的首字母正好连成 “LoVe HA”,这样的顺序被约定俗成的叫做Love Ha 规则。特殊性规则从理论上讲比较抽象和难懂,但在实践中,只要样式表是设计良好的,并不会有太多这方面的困扰,因此本文也不再做深究,更多的技术请参考的文章更新!<br 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12px">/home/wwwroot/jxjierui.cn/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 13.96 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\BuildLiteBehavior [ RunTime:0.000006s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --END-- [ RunTime:0.000025s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000238s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000267s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000049s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000065s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.003293s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.003310s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000067s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000077s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/0707ba56f01a23be8d0974e9f8b2b197.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/4b671fc78a4e5276149b61d06347dedf.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> </div> </div> <div id="think_page_trace_close" style="display:none;text-align:right;height:15px;position:absolute;top:10px;right:12px;cursor: pointer;"><img style="vertical-align:top;" 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3ukcXd5s7LvLD3me61WkuTCpJzYAyRurMB44EdEJzTfU271lUJC03YjXJXzYOGZwN4D8eB5jlfLrdWfzGRW7icMPfiSO6Oe7s20bmhdgLX4Z23B+s3JgQESzUDiMboSzDMHFpNMwccGePauhfwjzwnI2wu9zKGgEFg80jcZ7MHllk07s1H+5yojtUQTlH4nFdLKTGwDmPbIklOb1L1zO4T6N8NCuDLFLS/C63c0eNRimZ++s5BMBHxU11jHchI9oFVUxRh/eMDzHEzGYu0Lg8gJ7oS/tFCwoic44fyUtix0n/46vP4bf+//BRgAYwDDar4ncHIAAAAASUVORK5CYII="></div> 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