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Jun 21, 2016 am 08:58 AM

在在学习css之前，我们需要对HTML的知识有基本的了解！

什么是CSS?

CSS是Cascading style Sheets的简称，中文译作“层叠样式表单”，我把它叫作“层叠样式表”，我感到这样顺口一点，没别的意思。实际上它是一组样式。你可能对CSS这个名词比较陌生，实际上无论你用Internet Explorer还是 Netscape Navigator在网上冲浪，几乎随时都在与CSS打交道，在网上没有使用过CSS的网页可能不好找。不管你用什么工具软件制作网页，都有在有意无意地使用CSS。用好CSS能使你的网页更加简炼，为什么同样内容的网页，有的人做出来有几十KB，而高手做出来只有十几KB，CSS在其中的作用是不言而喻的。

谈谈 css 页面优化的三种方式：

第一、二种方式：

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title></title>    <!--    <h2 id="第二种方式-和下面第二种方式结合使用-其中-c-中-代表class选择器"> 第二种方式，和下面第二种方式结合使用，其中 .c1 中 “.” 代表class选择器</h2>    -->    <style>        .c1{            background-color: red;border: 10px solid green;        }    </style></head><body>    <h2 id="css-第一种存在方式">css 第一种存在方式</h2>    <div style="background-color: red;border: 10px solid green;">css 第一种方式 div</div>    <div style="background-color: red;border: 10px solid green;">css 第一种方式 div</div>    <h2 id="css-第二种存在方式-class-c-名字">css 第二种存在方式 class = "c1名字"</h2>    <div class="c1">css 第二种方式 div</div>    <div class="c1">css 第二种方式 div</div>    <div class="c1">css 第二种方式 div</div></body></html>

第三种方式：(直接引用css文件)

可将重复代码写在一个".css" 文件中

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title></title>    <!--    <h2 id="css-第三种存在方式-下面直接引用">css 第三种存在方式，下面直接引用</h2>    -->    <link rel="stylesheet" href="common.css" /></head><body>    <h2 id="css-第三种存在方式">css 第三种存在方式</h2>    <div class="c1">css 第三种方式 div</div>    <div class="c1">css 第三种方式 div</div>    <div class="c1">css 第三种方式 div</div></body></html>

common.css 中内容：

.c1{    background-color: red;border: 10px solid green;}

第三种方式，直接引用common.css 文件中的内容，截图如下

演示效果如下：

持续更新中...

更多链接： http://www.w3school.com.cn/css/

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