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html中子div用了浮動怎樣讓父div的大小自動撐開，中子div
浮動子div撐開父div的幾種方法：
（1）在父div中在添加一個清除浮動的子div<div> 1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>HTML5 Canvas畫印章</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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