发现一个很好玩，很强大的网站
RunJS - 在线编辑、展示、分享、交流你的 JavaScript 代码 http://runjs.cn/
比如：
http://runjs.cn/detail/lp6rqcsr
或者：
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="utf-8"> <title>登录</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="author" content=“"> </head> <!-- HTML5 shim, for IE6-8 support of HTML5 elements --> <!--[if lt IE 9]> <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script> <![endif]--> <link class="bootstrap library" rel="stylesheet" type="text/css" href="http://sandbox.runjs.cn/js/sandbox/bootstrap-2.2.0/css/bootstrap.min.css"> <script class="bootstrap library" src="http://sandbox.runjs.cn/js/sandbox/jquery/jquery-1.7.2.min.js" type="text/javascript"></script> <script class="bootstrap library" src="http://sandbox.runjs.cn/js/sandbox/bootstrap-2.2.0/js/bootstrap.min.js" type="text/javascript"></script> </head> <body> <div class="container"> <section class="loginBox row-fluid"> <div class="tabbable" id="tabs-634549"> <ul class="nav nav-tabs"> <li> <a href="#panel-60560" data-toggle="tab">帐号登录</a> </li> <li class="active"> <a href="#panel-549981" data-toggle="tab">二维码登录</a> </li> </ul> <div class="tab-content"> <div class="tab-pane" id="panel-60560"> </div> <div class="tab-pane active" id="panel-549981"> <DIV><input type="text" name="username" placeholder="用户名"/></DIV> <DIV> <input type="text" name="password" placeholder="密码"/> </DIV> <DIV class="span6"><label><input type="checkbox" name="rememberme" />下次自动登录</label></DIV> <DIV class="span1"><input type="button" value=" 登录 " class="btn btn-primary"></DIV> </div> </div> </div> </section><!-- /loginBox --> </div> <!-- /container --> </body> </html>
*{margin:0;padding: 0;}
body{background: #444 url(http://sandbox.runjs.cn/uploads/rs/418/nkls38xx/carbon_fibre_big.png)}
.loginBox{420px;height:230px;padding:0 20px;border:1px solid #fff; color:#000; margin-top:40px; border-radius:8px;background: white;box-shadow:0 0 15px #222; background: -moz-linear-gradient(top, #fff, #efefef 8%);background: -webkit-gradient(linear, 0 0, 0 100%, from(#f6f6f6), to(#f4f4f4));font:11px/1.5em 'Microsoft YaHei' ;position: absolute;left:50%;top:50%;margin-left:-210px;margin-top:-115px;}
.loginBox h2{height:45px;font-size:20px;font-weight:normal;}
.loginBox .left{border-right:1px solid #ccc;height:100%;padding-right: 20px; }