盒子模型 和样式选择器和伪类选择器

 

<!DOCTYPE html>
<html>
    <head>
       <title>CSS3-属性选择器</title>
       <style>
        body {
            margin: 0;
            padding: 0;
            font-family: '';
            font-family: '微软雅黑';
            background-color: #F7F7F7;
        }
        .wrapper {
            width: 1024px;
            margin:0 auto;
        }
        .wrapper>section{
            min-height: 300px;
            margin-bottom: 30px;
            box-shadow: 1px 1px 4px #DDD;
        }
        .wrapper>header{
            text-align:center;
            line-height: 1;
            padding: 20px;
            margin-bottom: 10px;
            font-size: 30px;
        }
        .wrapper >section> header{
            line-height: 1;
            padding: 10px;
            font-size: 20px;
            color: #333;
            background-color: #eee;
        }
        .wrapper .wrap-box{
           padding: 20px;
        }
        form {
            width:300px;
            height: 300px;
            margin:0 auto;
        }
        form input[type="text"]{
            width: 200px;
            height: 30px;
        }
        form input[type="password"]{
            width: 200px;
            height: 30px;
        }
        .attr1{

        }
        .attr1 a[href="./a.rmvb"]{
            color: red;
        }
        .attr1 a[href="./b.rmvb"]{
            color: pink;
        }
        .download{

        }
        /*  E[attr~=val] 表示的一个单独的属性值 这个属性值是以空格分隔的*/
        .attr2 a[class~="download"]{
            color:red;
        }
        /*  E[attr|=val] 表示的要么一个单独的属性值 要么这个属性值是以"-"分隔的*/
        .attr3 a[class|="download"]{
            color:yellow;
        }
            /*  E[attr*=val] 表示的属性值里包含val字符并且在“任意”位置 */
        .attr4 a[class*="download"]{
            color: red;
        }
            /*  E[attr^=val] 表示的属性值里包含val字符并且在“开始”位置 */
        .attr5 a[class^="download"]{
            color: red;
        }
            /*  E[attr$=val] 表示的属性值里包含val字符并且在“结束”位置 */
        .attr6 a[class$="download"] {
            color: red;
        }
        </style>
    </head>
    <body>
        <div class="wrapper">
            <header>CSS3-属性选择器</header>
            <section>
                <header>简介</header>
                <div class="wrap-box">
                    <form action="">
                        <ul>
                            <li>
                                姓名:<input type="text">
                            </li>
                            <li>
                                密码:<input type="password">
                            </li>
                            <li>
                                性别：<input type="radio"> 男
                                     <input type="radio"> 女
                            </li>
                            <li>
                                兴趣：<input type="checkbox" name="" id="d">代码
                            </li>
                            <li>
                                <input type="submit" value="提交" id="" >
                            </li>
                        </ul>
                    </form>
                </div>
            </section>
            <section class="attr1">
                <header>E[attr]</header>
                <div class="wrap-box">
                    <a href="./a.rmvb" class="download download-movie">下载</a>
                    <a href="./b.rmvb" class="download download-movie">下载</a>
                    <a href="./a.mp3" class="download download-music">下载</a>
                </div>
            </section>
            <section class="attr2">
                <header> E[attr~=attr]</header>
                <div class="wrap-box">
                    <a href="#" class="download dowmload-movie">下载</a>
                    <a href="#" class="download dowmload-movie">下载</a>
                    <a href="#" class="download dowmload-music">下载</a>
                </div>
            </section>
            <section class="attr3">
                <header>E[attr!=attr]</header>
                <div class="wrap-box">
                    <a href="#" class="download">下载</a>
                    <a href="#" class="download-movie">下载</a>
                    <a href="#" class="download-music">下载</a>
                </div>
            </section>
            <section class="attr4">
                <header>E[attr*=val]</header>
                <div class="wrap-box">
                    <a href="#" class="download">下载</a>
                    <a href="#" class="moviedownload">下载</a>
                    <a href="#" class="downmloadmusic">下载</a>
                </div>
            </section>
            <section class="attr5">
                <header>
                    E[attr^=val]
                </header>
                <div class="wrap-box">
                    <a href="#" class="download">下载</a>
                    <a href="#" class="moviedownload">下载</a>
                    <a href="#" class="downloadmusic">下载</a>
                </div>
            </section>
            <section class="attr6">
                <header>E[attr$=val]</header>
                <div class="wrap-box">
                    <a href="#" class="download">下载</a>
                    <a href="#" class="moviedownload">下载</a>
                    <a href="#" class="downloadmusic">下载</a>
                </div>
            </section>
        </div>
    </body>
</html>

 

<!DOCTYPE html>
<html>
    <head>
        <title>CSS3-伪类选择器</title>
        <style>
            body {
                margin:0 ;
                padding: 0;
                font-family: '微软雅黑';
                background-color: #f7f7f7;
            }
            .wrapper{
                width: 1024px;
                margin:0 auto;
            }
            .wrapper >section{
                min-height: 300px;
                margin-bottom: 30px;
                box-shadow: 1px 1px 4px #ddd;
                background-color:#fff;
            }
            .wrapper >header{
                line-height: 1;
                text-align:center;
                padding: 20px ;
                margin-bottom: 10px;
                font-size: 30px;
            }
            .wrapper> section> header{
                line-height: 1;
                font-size: 22px;
                padding: 10px ;
                color:#333;
                background-color: #EEE;
            }
            .wrapper .wrap-box{
                padding: 20px;
            }
            section:nth-of-type(4) { /*表示第几个*/

            }
            section:nth-of-type(4) li:nth-child(2) span:only-of-type {
             color: red;
            }
            section:nth-of-type(5) li:nth-child(n) {/*n表示下面从1开始的*/

            /*n = 2n;
            n = n;
            n = 3n;*/
            color: red;
            }
            section:nth-last-of-type(2) p:empty{
                width: 50px;
                height: 50px;
                background-color:blue;
            }
            section:target{
                background-color: red; /*点击的时候显示*/
            }
            section:last-child p:after{
                content: 'after';
                color: red;
            }
            section:last-child p:before {
            content: 'before';
            color: red;
            }
            section:last-child p:nth-child(3) {/*表示选择第三个元素是p的*/
            color: red;
            }
        </style>
    </head>
    <body>
        <div class="wrapper">
            <header>伪类选择器</header>
            <section id="demo1">
                <header>简介</header>
                <div class="wrap-box">

                </div>
            </section>
            <section id="demo2">  
                <header>E:first-child</header>
                <div class="wrap-box"></div>
            </section>
            <section id="demo3">
                <header>
                    E:last-child
                </header>
                <div class="wrap-box">

                </div>
            </section>
            <section>
                <header>E:only-child</header>
                <div class="wrap-box">
                    <ul>
                        <li>
                            <span>我是span</span>
                            <span>我是第2个span</span>
                        </li>
                        <li>
                            <span>我是span</span>
                            <p>我是p</p>
                        </li>
                        <li></li>
                        <li></li>
                    </ul>
                </div>
            </section>
            <section>
                <header>
                    E:nth-child(n)
                </header>
                <div class="wrap-box">
                    <p>n的取值为大于等于1，当n作为系数是n的取值可以为0 比如2n+1</p>
                    <ul>
                        <li>
                            <span>
                                我是span
                            </span>
                        </li>
                        <li>
                            <span> 我是span</span>
                        </li>
                        <li>
                            
                        </li>
                        <li>
                            yy
                        </li>
                    </ul>
                </div>
            </section>
            <section>
                <header>
                    E:nth-last-child(n)
                </header>
                <div class="wrap-box">

                </div>
            </section>
            <section>
                <header>
                   E:first-of-type
                </header>
                <div class="wrap-box">

                </div>
            </section>
            <section>
                <header>E:last-of-type</header>
                <div class="wrap-box">

                </div>
            </section>
            <section>
                <header>
                    E:only-of-type
                </header>
                <div class="wrap-box">

                </div>
            </section>
            <section>
                <header>
                    E:nth-of-type(n)
                </header>
                <div class="wrap-box"></div>
            </section>
            <section>
                <header>E:nth-last-of-type(n)</header>
                <div class="wrap-box"></div>
            </section>
            <section>
                <header>
                    E:empty
                </header>
                <div class="wrap-box">
                    <span>E:empty 表示元素没有任何内容才被选中</span>
                    <p>111</p>
                </div>
            </section>
            <section>
                <header>
                    E:target
                </header>
                <div class="wrap-box">
                    <a href="#demo1">demo1</a>
                    <a href="#demo2">demo2</a>
                    <a href="#demo3">demo3</a>
                    <p></p>
                </div>
            </section>
            <section>
                <header>
                    E:after
                </header>
                <div class="wrap-box">
                    <p>p</p>
                    <span>span</span>
                    <p>
                        p
                    </p>
                    <span>span</span>
                    <p>p</p>
                    <span>span</span>
                </div>
            </section>
        </div>
    </body>
</html>

 

 

<!DOCTYPE html>
<html>
    <head>
        <title>
            demo4
        </title>
        <style>
            body{
                margin: 0;
                padding: 0;
                font-family: '微软雅黑';
                background-color: #f7f7f7;
            }
            .wrapper{
                width: 1024px;
                margin: 0 auto;
            }
            .wrapper > section {
            min-height: 300px;
            margin-bottom: 30px;
            box-shadow: 1px 1px 4px #DDD;
            background-color: #FFF;
        }

        .wrapper > header {
            text-align: center;
            line-height: 1;
            padding: 20px;
            margin-bottom: 10px;
            font-size: 30px;
        }

        .wrapper section > header {
            line-height: 1;
            padding: 10px;
            font-size: 22px;
            color: #333;
            background-color: #EEE;
        }

        .wrapper .wrap-box {
            padding: 20px;
        }
        section:nth-child(3) p::selection{ /*相对其父元素的第三个元素且是section*/
            background-color: red;
            color: blue;
        }
        section:nth-child(4) input::-webkit-input-placeholder  {
            color: blue;
            
        }
        section:nth-child(4) input  {
            width: 200px;
            height: 30px;
        }
        </style>
    </head>
    <body>
        <div class="wrapper">
            <header>
                伪元素选择器
            </header>
            <section>
                <header>
                    简介
                </header>
                <div class="wrap-box">

                </div>
            </section>
            <section>
                <header>
                    E::selection
                </header>
                <div class="wrap-box">
                    <p>一大段话一大段话一大段话一大段话一大段话一大段话一大段话一大段话</p>
                </div>
            </section>
            <section>
                <header>
                    E::placeholder
                </header>
                <div class="wrap-box">
                    <input type="text" placeholder="我是占位符">  
                </div>
            </section>
        </div>
    </body>
</html>

 

参考：https://www.w3school.com.cn/cssref/css_selectors.asp

posted @ 2020-03-15 21:56  剧里局外  阅读(222)  评论(0)  编辑  收藏  举报