h5背景

1、背景属性复习： background-image background-color background-repeat background-position background-attachment

2、新增属性： background-size: background-size:x y; // 水平垂直方向的尺寸，像素/百分比/auto/⋯ background-size:cover; //保持宽高比不变，保证占满盒子，但不保证能看到全部 background-size:contain; //保持宽高比不变，保证看清全图，但可能占不满盒子

多背景： background-image:url(1.jpg),url(2.jpg);

background-origin 背景区域定位 border-box：从border区域开始显示背景 padding-box：从padding区域开始显示背景 content-box：从content内容区域开始显示背景

background-clip 背景绘制区域 border-box：从border区域开始绘制背景 padding-box：从padding区域开始绘制背景 content-box：从content内容区域开始显示背景

3、背景练习:

<!DOCTYPE HTML>
<html>
<head>
    <title>your title name</title>
    <meta charset="utf-8">
    <meta name="Author" content="Wilson Xu">
    <style type="text/css">
      *{margin: 0;padding: 0;font-family: "Microsoft yahei";}
      a{text-decoration: none;}
      a img{display: block;border: none;}
      li{list-style: none;}

      .container{
        width: 1200px;
        padding: 20px;
        margin: 10px auto;
        border: 1px dashed #ccc;
      }
      .container h4{padding-bottom: 5px;}
      .container ul{
        width: 1200px;
        overflow: hidden;
      }
      .container ul li{
        float: left;
        width: 331px;
        padding: 20px;
        height: 240px;
        margin-right: 10px;
        border: 10px solid rgba(10,10,10,.3);
        background: url('images/1.jpg') no-repeat;
        background-size: 371px auto;
      }
      .container ul li:last-child{margin-right: 0;}

      .container ul.origin li:nth-child(1){
        background-origin: border-box;
      }
      .container ul.origin li:nth-child(2){
        background-origin: padding-box;
      }
      .container ul.origin li:nth-child(3){
        background-origin: content-box;
      }

      .container ul.clip li:nth-child(1){
        background-clip: border-box;
      }
      .container ul.clip li:nth-child(2){
        background-clip: padding-box;
      }
      .container ul.clip li:nth-child(3){
        background-clip: content-box;
      }

      section .pic{
        width: 600px;
        height: 400px;
        margin: 20px auto;
        border: 1px dashed #ddd;
        background: url('images/3.jpg') no-repeat center center/auto 200px, url('images/2.jpg') no-repeat center center/auto 300px, url('images/1.jpg') no-repeat center center/auto 400px;
      }
      section p{
        font-size: 14px;
        color: #f01010;
      }
    </style>
</head>
<body>
    <div class="container">
      <section>
        <h4>1、background-origin: border-box | padding-box | content-box</h4>
        <ul class="origin">
          <li></li>
          <li></li>
          <li></li>
        </ul>
      </section>
      <section>
        <h4 style="margin-top: 20px;border-top: 1px dashed #ccc;">2、background-clip: border-box | padding-box | content-box</h4>
        <ul class="clip">
          <li></li>
          <li></li>
          <li></li>
        </ul>
      </section>
      <section>
        <h4 style="margin-top: 20px;border-top: 1px dashed #ccc;">3、多背景:background: url('images/3.jpg') no-repeat center center/auto 200px, url('images/2.jpg') no-repeat center center/auto 300px, url('images/1.jpg') no-repeat center center/auto 400px;
</h4>
        <div class="pic"></div>
        <p>注释：复合写background-size的时候，一定要用/与其他值隔开。</p>
      </section>
    </div>
</body>

</html>

练习代码部分：

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