css 标签选择器、id选择器、类选择器实例
1:标签选择器
标签选择器,是所有带有某种标签的都生效。这里以p为例,也就是所有的带有p标记的都会这样的样式
实例:选择所有
元素 :
<code class="html"> <style> p { background-color:yellow; } </style> <h1 id="Welcome-to-My-Homepage">Welcome to My Homepage</h1> <div> <p id="firstname">My name is Donald.</p> <p id="hometown">I live in Duckburg.</p> </div> <p>My best friend is Mickey.</p> </code>
在线运行
2:id选择器
注意id选择器是唯一的,因为只有id="yy"的才有这种样式,而一个页面里元素的Id必须是唯一的,所以。。。你懂得id选择器以#开头用法是:id=""
实例:为 id="firstname" 元素添加指定样式:
<code class="html"> <style> #firstname { background-color:yellow; } </style> <h1 id="Welcome-to-My-Homepage">Welcome to My Homepage</h1> <div class="intro"> <p id="firstname">My name is Donald.</p> <p id="hometown">I live in Duckburg.</p> </div> <p>My best friend is Mickey.</p> </code>
在线运行
3:类选择器.
类选择器以.开头,只要把元素的class="" 就能表现为这种样式了用法是:class=""
实例:
<code class="html"> <style> .intro { background-color:yellow; } </style> <h1 id="Welcome-to-My-Homepage">Welcome to My Homepage</h1> <div class="intro"> <p>My name is Donald.</p> <p>I live in Duckburg.</p> </div> <p>My best friend is Mickey.</p> </code>
在线运行

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