浮动子div撑开父div的几种方法：
（1）在父div中在添加一个清除浮动的子div，该div不设置任何样式，只用来清除浮动
（2）在父div的css样式中设置overflow：hidden;zoom:1;
（3）设置父div也为浮动元素float：left；，这样设置的坏处是不能用margin：auto；实现居中
（4）设置父元素display:inline-block;，这样设置的坏处是不能用margin：auto；实现居中
（5）在父div中添加
子元素
小结：用哪一种方法根据自身情况来使用。
http://www.jb51.net/article/43261.htm
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>HTML5 Canvas画印章</title> 6 <style> 7 .divCss{ 8 position: relative; 9 width: 1024px;10 height: auto;11 border: 1px solid #999999;12 margin:auto;13 /*display:inline-block;*/14 /*float: left;*/15 /*overflow: hidden;16 zoom:1;*/17 }18 .style{19 position: relative;20 width: 300px;21 height: 400px;22 float: left;23 border: 1px solid #aaaaaa;24 margin:10px; 25 }26 </style>27 </head> 28 <body>29 <div class="divCss">30 <div class="style"></div>31 <div class="style"></div>32 <div class="style"></div>33 <div style=" clear:both;"></div> 34 </div>35 </body>36 </html>
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