效果如下：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> fieldset{width: 500px;} .error{color:red;} #info{color:#008000;font-weight:bold;} </style> <script type="text/javascript" src="../../js/jquery.js"></script> <script type="text/javascript"> $(function(){ $('#check').click(validate); function validate(){ var dataValid=true; $('#info').html(''); $('.required').each(function(){ var cur=$(this); cur.next('span').remove(); if($.trim(cur.val())==''){ cur.after('<span class="error">Mandatory field</span>') ; dataValid=false; } }); if(dataValid){ $('#info').html('Validation OK!'); } } }); </script> </head> <body> <form> <fieldset> <legend><strong>Personal</strong></legend> <table> <tbody> <tr> <td>Name:*</td> <td><input type="text" class="required"/></td> </tr> <tr> <td>Address:*</td> <td><input type="text" class="required"/></td> </tr> </tbody> </table> </fieldset> <br/> <span id="info"></span> <br/> <input type="button" value="Check" id="check"/> </form> </body> </html>