代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title></title><style type="text/css">body { font:12px/19px Arial, Helvetica, sans-serif; color:#666;}form div { margin:5px 0;}.int label { float:left; width:100px; text-align:right;}.int input { padding:1px 1px; border:1px solid #ccc;height:16px;}.sub { padding-left:100px;}.sub input { margin-right:10px; }.formtips{width: 200px;margin:2px;padding:2px;}.onError{background:#FFE0E9 url(../img/reg3.gif) no-repeat 0 center;padding-left:25px;}.onSuccess{background:#E9FBEB url(../img/reg4.gif) no-repeat 0 center;padding-left:25px;}.high{color:red;}</style><!-- 引入jQuery --><script src="../scripts/jquery-1.3.1.js" type="text/javascript"></script><script type="text/javascript">//<![CDATA[$(function(){//如果是必填的，则加红星标识.$("form :input.required").each(function(){var $required = $("<strong class='high'> *</strong>"); //创建元素$(this).parent().append($required); //然后将它追加到文档中});//文本框失去焦点后$('form :input').blur(function(){var $parent = $(this).parent();$parent.find(".formtips").remove();//验证用户名if( $(this).is('#username') ){if( this.value=="" || this.value.length < 6 ){var errorMsg = '请输入至少6位的用户名.';$parent.append('<span class="formtips onError">'+errorMsg+'</span>');}else{var okMsg = '输入正确.';$parent.append('<span class="formtips onSuccess">'+okMsg+'</span>');}}//验证邮件if( $(this).is('#email') ){if( this.value=="" || ( this.value!="" && !/.+@.+\.[a-zA-Z]{2,4}$/.test(this.value) ) ){var errorMsg = '请输入正确的E-Mail地址.';$parent.append('<span class="formtips onError">'+errorMsg+'</span>');}else{var okMsg = '输入正确.';$parent.append('<span class="formtips onSuccess">'+okMsg+'</span>');}}}).keyup(function(){$(this).triggerHandler("blur");}).focus(function(){$(this).triggerHandler("blur");});//end blur//提交，最终验证。$('#send').click(function(){$("form :input.required").trigger('blur');var numError = $('form .onError').length;if(numError){return false;}alert("注册成功,密码已发到你的邮箱,请查收.");});//重置$('#res').click(function(){$(".formtips").remove();});})//]]></script></head><body><form method="post" action=""><div class="int"><label for="username">用户名:</label><input type="text" id="username" class="required" /></div><div class="int"><label for="email">邮箱:</label><input type="text" id="email" class="required" /></div><div class="int"><label for="personinfo">个人资料:</label><input type="text" id="personinfo" /></div><div class="sub"><input type="submit" value="提交" id="send"/><input type="reset" id="res"/></div></form></body></html>
