盒子模型、元素对齐方式+绝对定位实现-2018年8月16日作业 - html

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实例

    <!DOCTYPE HTML>
    <html>
    <head>
        <title>常用四种元素的对齐方式</title>
        <meta charset="UTF-8">
        <style>
            body{
                margin:0;
                padding:0;
                width:800px;
                height:600px;
            }
            div{
                margin:auto;
                padding:0;
            }
            hr,ul,span{
                margin:0;
                padding:0;
            }
            .align1{
                width:400px;
                height:150px;
                background-color: #0388f1;
                text-align:center;
                line-height:150px;
            }
            .align2{
                width:400px;
                height:150px;
                background-color: #a6f13b;
                text-align:center;
                line-height:100px;
            }
            .align21{
                width:100px;
                height:100px;
                background-color: #98cddc;
                position: absolute;
                top:175px;
                left:350px;
            }
            .align3{
                width:400px;
            }
            .align31{
                width:400px;
                height:150px;
                background-color: #b3f1c6;
                text-align:center;
                display:table-cell;
                vertical-align: middle;
            }
            .align4{
                width:400px;
                height:150px;
                background-color: #49ecf1;
                text-align: center;
                display:table-cell;
                vertical-align: middle;
            }
            .align4 li{
                font-size:30px;
                list-style: none;
                padding:5px;
                display:inline;
            }
            .align4 a{
                text-decoration:none;
            }
        </style>
    </head>
    <body><div>
        <hr>
        <div class="align1"><a href="http://www.php.cn">PHP学习网</a></div>
        <hr>
        <div class="align2">
            <div class="align21">PHP学习网</div></div>
        <hr>
        <div class="align3">
            <div class="align31">
                <span>PHP学习网</span><br>
                <span>php.cn</span>
            </div>
        </div>
        <hr>
        <div class="align4">
            <ul>
                <li><a href="">1</a></li>
                <li><a href="">2</a></li>
                <li><a href="">3</a></li>
                <li><a href="">4</a></li>
                <li><a href="">5</a></li>
            </ul>
        </div>
        <hr>
    </div>
    </body>
    </html>

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实例

  <!DOCTYPE HTML>
    <html>
    <head>
        <title>绝对定位实现十字架</title>
        <meta charset="UTF-8">
        <style>
            body{
                margin:0;
                padding:0;
            }
            .box{
                width:300px;
                height:300px;
            }
            .box1{
                width:100px;
                height:100px;
                background-color: #0388f1;
                position:absolute;
                top:0;
                left:100px;
            }
            .box2{
                width:100px;
                height:100px;
                background-color: #51534d;
                position:absolute;
                top:100px;
                left:0px;
            }
            .box3{
                width:100px;
                height:100px;
                background-color: #3fdc4b;
                position:absolute;
                top:100px;
                left:200px;
            }
            .box4{
                width:100px;
                height:100px;
                background-color: #98cddc;
                position:absolute;
                top:200px;
                left:100px;
            }

        </style>
    </head>
    <body>
    <div class="box">
        <div class="box1"></div>
        <div class="box2"></div>
        <div class="box3"></div>
        <div class="box4"></div>
    </div>
    </body>
    </html>

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总结：

内容区content
边框 border
内边距padding
外边距margin

边框的两种写法一样:
border-top-width:5px;
border-top-style:solid;
border-top-color:red;

border-right:10px solid green;

文档流是元素的排列方式，总是水平排列

外边距在垂直方向上会发生塌陷，以大数值为准
多个盒子的外边距重叠是不合计的，以大的为准

Correction status：qualified

Teacher's comments：

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