First introduction to CSS_html/css_WEB-ITnose
<strong> CSS全称Cascading Style Sheets，即级联样式表</strong>
<strong> CSS是一种表示文件样式的语言,也可以说是用户看到的界面,是一种真正能做到表现与内容的分离的语言</strong>
<strong> 一、基本语法</strong>
<strong> 规则:CSS规则主要由选择器以及一条或多条声明组成</strong>
<strong> 选择器:就是定义在代码段中的标签，用来作为CSS识别的标记</strong>
<strong> 声明就是要对选择器中的内容设置的格式</strong>
<strong> 实例：</strong>
<strong> 在代码段中设置选择器如下，Style用来标记文字“提高班”</strong>
<pre class='brush:php;toolbar:false;'><strong> <div id="style">提高班</id></strong>
<strong> 那么在CSS中可以根据选择器来设置文字“提高班”的格式</strong>
<strong> #style{</strong><strong>font-size:12px;</strong>
<strong>text-decoration:underline;</strong>
<strong> color:#fff;</strong>
<strong> 这样就可以设置文字“提高班”的字号，下划线和字体颜色了</strong>
<strong> 这样看来，CSS也体现了面向对象抽象的思想，把对文件的设置抽象出来，通过CSS语言来实现，从而减</strong>
<strong> 少了web代码的负担，而且在更在样式的时候也会很方便，可以通过对一类文件做好标记，统一修改即可。</strong>
<strong> 二、使用方法</strong>
<strong> 以上说的是CSS的基本语法，但是在具体使用样式表时会有多种方法，主要有一下方法</strong>
<strong> 1.外联式Linking：将网页链接到外部样式表</strong>
<strong> <head><link href="css/common.css" rel="stylesheet" /></head></strong>
<strong> 这个样式就是牛腩在没词新建一个web层，首先要做的工作，就是公共样式表拖到新建的web中</strong>
<strong> 优点：当样式需要被用到很多页面的时候，可以通过外联式改变一个文件夹达到改变多个页面的效果</strong>
<strong> 2.内联式Inline：顾名思义，它就是内嵌到网页各个元素中</strong>
<strong> </strong><pre name="code" class="n"><p style="color: red; margin-left: 20px"> This is a paragraph </p>
<strong> 当网页中一些特殊的样式要应用到个别元素时就可以使用内嵌式，直接在代码中写即可</strong>
<strong> 3.嵌入式Embedding：在网页上穿件嵌入的样式表</strong>
<strong> </strong><pre name="code" class="n"><head><style type="text/css"> body {background-color: red} p {margin-left: 20px}</style></head><strong> 对单个文件嵌入特别的样式时可以用嵌入式样式表</strong>
<strong> 内联式和嵌入式区别</strong>
<strong> 个人认为两个最大的区别在于作用的范围不同，内联式是作用于个别元素而嵌入式作用于文件，两者</strong>
<strong> 的本质都是一样的，都是嵌入在网页中</strong>
<strong> 三、小结</strong>
<strong> CSS作为一种样式设计语言，它的精确度是非常高的，从牛腩中我们就可以发现，可以精确到单位像素</strong>
<strong> 而且它还几乎设置所有的文字样式，有很强的易读性</strong>
<strong> 以上只是CSS知识的九牛一毛，关于CSS的内容还有很多需要去学习，后续会有对选择器及CSS核心内容</strong>
<strong> 的总结</strong>
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