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HTML一些常用的标签以及CSS样式和选择器—2018年8月10日20时00分
疯狂石头的博客
Original
761 people have browsed it

第一次作业


实例

html文件

<!DOCTYPE html>
<!--DTD文档声明:html xml xhtml-->

<head>
    <meta charset="utf-8">
    <!--编码类型-->
    <title>document</title>
    <link rel="stylesheet" type="text/css" href="static/style.css">
    <!--外部引入样式,为了共享-->
    <link rel="shortcut icon" type="image/x-icon" href="images/logo-footer.png">
    <!--网页标题小图标-->

    <style>    /*文档内部样式:应用于当前页面*/
        
        /*通用选择器*/

        * {
            text-decoration: none;
            background:#b6caea;
        }


        /*类选择器*/

        .box1 {
            width: 300px;
            height: 100px;
            background: #009AE1;
        }

        /*id选择器*/
        #box3{
            width: 300px;
            height: 100px;
            background: #ff2f2f!important;
        }

        #box2 {
            width: 300px;
            height: 100px;
            background: red;
        }
         #box3{
            width: 300px;
            height: 100px;
            background: #ce8181;
        }


       
        /*标签选择器*/
        div{
            background: white;
        }
        a {
            color: #ff9300;
        }
        /*属性选择器*/
        a[href="https://www.baidu.com"] {
            color: cyan;
        }
        
        a[href="http://www.php.cn"] {
            color: crimson;
        }

        /*后代选择器*/

        div a {
            color: darkseagreen;
        }
    </style>
</head>

<body>
    <div class="box1"></div>
    <HR> <!--分割线-->
    <div class="box1" id="box2" style="background:#66b197 ">
        元素内嵌样式 总结:样式优先级:元素内嵌样式>文档内部样式>外部引入样式;
    </div>
    <hr>
    <div id="box3">
         总结:选择器优先级:!important>id>类 伪类 属性>标签>通配>继承>浏览器默认 
    </div>
    <HR>
    <a href="https://www.baidu.com">百度</a>
    <HR>
    <a href="http://www.php.cn">php中文网</a>
    <HR>
    <a href="demo2.html">demo2</a>
    <HR>
    <a href="#">#</a>
    <HR>
    <div id="box">
        <a href="">php</a>
    </div>
</body>

</html>

运行实例 »

点击 "运行实例" 按钮查看在线实例

ScreenShot_20180811175428.png

实例

外部引入css样式

@charset utf-8 ;
#box2 {
    width: 300px;
    height: 100px;
    background: #0058ff;
}

运行实例 »

点击 "运行实例" 按钮查看在线实例


手写代码:

1.png

2.png

总结:

    1. 类选择器 class=""  css中表示为.xxx;

        id选择器 id=""  css中表示为#xxx

       后代选择器 用空格连接

    2.优先级问题

        2.1元素内嵌样式>文档内部样式>外部引入样式;

        2.2!important>id>类 伪类 属性>标签>通配>继承>浏览器默认

Correction status:qualified

Teacher's comments:
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