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css入门：css优先级、选择器、盒模型-2019-09-03
Doctor_Zhong
Original
616 people have browsed it

本次作业的演示页面：演示页面

  1. 实例演示:iframe标签的使用

实例

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>内联框架</title>
</head>
<!-- 9月2日作业: 
1. 实例演示:iframe标签的使用 
2. 实例演示: css样式设置的优先级 
3. 实例演示: css的id, class与标签选择器的使用规则 
4. 实例演示盒模型的五大要素: width, height, padding, border, margin(margin可暂忽略) -->

<body>

    <!-- 内联框架演示 -->
    <h2 style="text-align: 2em;padding: 2em;">内联框架演示：</h2>
    <h3>
        <ul style="float:left;margin: 1em;">
            <li style="list-style: none;margin:1em;"><a href="http://group-z.top/course/homework/09-02/cssyxj.html" target="section">CSS优先级</a></li>
            <li style="list-style: none;margin:1em;"><a href="http://group-z.top/course/homework/09-02/cssxzq.html" target="section">CSS选择器</a></li>
            <li style="list-style: none;margin:1em;"><a href="http://group-z.top/course/homework/09-02/hzmx.html" target="section">盒子模型五大要素</a></li>
        </ul>
    </h3>
    <p>
        <iframe frameborder="1" width="700" height="700" name="section"></iframe>
    </p>

</body>

</html>

运行实例 »

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内联框架.png

2. 实例演示: css样式设置的优先级

实例

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="">
    <title>css样式设置的优先级</title>
    <link rel="stylesheet" href="http://group-z.top/course/homework/09-02/style.css">
    <style>
        h2 {
            font-size: 1.25em;
            color: blue;
        }
        
        h4 {
            color: orange!important;
        }
    </style>
</head>

<body>
    <header>
        <h1>css样式设置的优先级</h1>
    </header>
    <main>
        <!-- 内联样式 -->
        <p>1.内联样式：</p>
        <h3 style="color: red;">展示内联样式的h3元素</h3>
        <!-- 内部样式 -->
        <p>2.内部样式：</p>
        <h2>展示单独内部样式（蓝色）的h2元素</h2>
        <h2 style="color: red;">展示内部样式（蓝色）+内联样式（红色）的h2元素</h2>
        <p><strong>结论：</strong>内联样式 > 内部样式</p>
        <!-- 外部样式 -->
        <p>3.外联样式：</p>
        <h1>展示外联样式(绿色)的h1元素</h1>
        <h2>展示外联样式（绿色）+内部样式（蓝色）的h2元素</h2>
        <p><strong>结论：</strong>内部样式 > 外联样式</p>
        <!-- ！important -->
        <p>4***portant</p>
        <h4 style="color: red;">展示内联样式（红色）+内部样式with '!important'（橘色）的h4元素</h2>
            <p><strong>结论：</strong>!important > 内联样式</p>


    </main>
</body>

</html>

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（博客系统不支持外联样式？）

页面效果如下：

css样式的优先级.png


3. 实例演示: css的id, class与标签选择器的使用规则

实例

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="">
    <title>css选择器</title>
    <!-- <link rel="stylesheet" href="http://group-z.top/course/homework/09-02/style.css"> -->
    <style>
        div {
            width: 90%;
            height: 5em;
            border: 3px double green;
            background-color: rgba(0, 0, 100, 0.2);
            margin-bottom: 2em;
        }
        
        .div_class_01 {
            width: 90%;
            height: 5em;
            border: 3px double blue;
            background-color: rgba(0, 200, 100, 0.2);
            margin-bottom: 2em;
        }
        
        #div_id_02 {
            width: 90%;
            height: 5em;
            border: 3px double red;
            background-color: rgba(200, 0, 100, 0.2);
            margin-bottom: 2em;
        }
    </style>
</head>
<!-- id, class与标签选择器 -->

<body>
    <header>
        <h1>css选择器</h1>
        <p>该部分通过内部样式模拟外联样式</p>
    </header>
    <main>
        <!-- 通过标签选择进行css样式设置 -->
        <div>
            <p>这是通过标签选择的css样式</p>
        </div>
        <!-- 通过class分类选择进行css样式设置 -->
        <div class="div_class_01" name="div_name_01" id="div_id_01">
            <p>这是通过class分类选择的css样式</p>
        </div>
        <aside class="div_class_01" name="div_name_01" id="div_id_01">
            <h4>这是通过class分类选择的css样式</h4>
        </aside>
        <!-- 通过id分类选择进行css样式设置 -->
        <div class="div_class_02" name="div_name_02" id="div_id_02">
            <p>这是通过id分类选择的css样式</p>
        </div>
    </main>
</body>

</html>

运行实例 »

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css选择器.png



4. 实例演示盒模型的五大要素: width, height, padding, border, margin(margin可暂忽略) -->

实例

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>盒子模型五大要素</title>
    <style>
        div {
            width: 40%;
            height: 5em;
            float: left;
            clear: right;
            box-sizing: border-box;
            border: 1px solid red;
            background-color: yellow;
            margin: 1em;
        }
        
        #a {
            width: 25%;
        }
        
        #b {
            height: 6em;
        }
        
        #c {
            border: 6px double green;
        }
        
        #d {
            padding: 2em;
        }
        
        #e {
            margin: 2em;
        }
    </style>
</head>

<body>
    <header>
        <h1>盒子模型五大要素</h1>
        <p>该部分使用内部样式</p>
    </header>
    <main>
        <div id="box">
            <p>我是原装盒子</p>
        </div>
        <div id="a">
            <p>我是盒子A：更改width</p>
        </div>
        <div id="box">
            <p>我是原装盒子</p>
        </div>
        <div id="b">
            <p>我是盒子B：更改height</p>
        </div>
        <div id="box">
            <p>我是原装盒子</p>
        </div>
        <div id="c">
            <p>我是盒子C：更改border</p>
        </div>
        <div id="box">
            <p>我是原装盒子</p>
        </div>
        <div id="d">
            <p>我是盒子D：更改padding</p>
        </div>
        <div id="box">
            <p>我是原装盒子</p>
        </div>
        <div id="e">
            <p>我是盒子E：更改margin</p>
        </div>
    </main>
</body>

</html>

运行实例 »

点击 "运行实例" 按钮查看在线实例

盒子模型5大要素.png




小结：

        通过学习css样式，可以极大的丰富html页面的排版，在元素的大小、颜色、背景、布局等等方面将极其灵活！期待更多前段内容的学习。

Correction status：qualified

Teacher's comments：还自己创建一个演示站, 辛苦了, 其实本站就自带了在线运行功能
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