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css实现footer定位 <!DOCTYPEhtml><htmllang="en"><head> <metacharset="UTF-8"> <metaname="viewport"content="width=device-width,initial-scale=1.0"> <metahttp-equiv="X-UA-Compatible"content="ie=edge"> <title>Document</title> <scriptsrc="http://csdnimg.cn/public/common/libs/jquery/jquery-1.9.1.min.js"type="text/javascript"></script> <style> html,body{ width:100%; height:100%; margin:0; padding:0; } *{ margin:0; padding:0; } .box{ width:100%; min-height:100%; padding-bottom:50px; box-sizing:border-box; background:#e4e4e4; } .content{ background:#fff; border-bottom:1pxsolid#999; } button{ margin:10pxauto; line-height:30px; width:20%; } footer{ height:50px; line-height:50px; text-align:center; margin-top:-50px; background:#fff; } </style> </head> <body> <divclass="box"> <buttononclick="beLong()">变长</button> <pclass="content"id="content">内容</p> </div> <footer>footer</footer></body><script> functionbeLong(){ document.getElementById('content').style.height='1000px'; }</script> </html>
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