<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <style type="text/css"> body{ font:normal 12px/17px Arial; } div{ padding:2px; } input, textarea { width: 12em; border: 1px solid #888; } .focus { border: 1px solid #f00; background: #fcc; } </style> <!-- 引入jQuery --> <script src="../../scripts/jquery.js" type="text/javascript"></script> <script type="text/javascript"> $(function(){ $(":input").focus(function(){ $(this).addClass("focus"); if($(this).val() ==this.defaultValue){ $(this).val(""); //获取焦点之后判断是不是更改值 } }).blur(function(){ $(this).removeClass("focus"); if ($(this).val() == '') { $(this).val(this.defaultValue); } }); }) </script> </head> <body> <form action="" method="post" id="regForm"> <fieldset> <legend>个人基本信息</legend> <div> <label for="username">名称:</label> <input id="username" type="text" value="名称" /> </div> <div> <label for="pass">密码:</label> <input id="pass" type="password" value="密码" /> </div> <div> <label for="msg">详细信息:</label> <textarea id="msg" rows="2" cols="20">详细信息</textarea> </div> </fieldset> </form> </body> </html>