<script type="text/javascript"> $(function(){ $(":input").focus(function(){ $(this).addClass("focus"); }).blur(function(){ $(this).removeClass("focus"); }); })//这个效果第三个textarea也会添加样式 </script> <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" /> </div> <div> <label for="pass">密码:</label> <input id="pass" type="password" /> </div> <div> <label for="msg">详细信息:</label> <textarea id="msg" rows="2" cols="20"></textarea> </div> </fieldset> </form>