<script type="text/javascript" src="lib/jquery.js"></script>
 <script type="text/javascript" src="dist/jquery.validate.min.js"></script>

<form class="cmxform" id="commentForm" method="get">
 <fieldset>
 <legend>验证完整的表单</legend>
 <p>
 <label for="firstname">名字</label>
 <input id="firstname" name="firstname" type="text">
 </p>
 <p>
 <label for="lastname">姓氏</label>
 <input id="lastname" name="lastname" type="text">
 </p>
 <p>
 <label for="username">用户名</label>
 <input id="username" name="username" type="text">
 </p>
 <p>
 <label for="password">密码</label>
 <input id="password" name="password" type="password">
 </p>
 <p>
 <label for="confirm_password">验证密码</label>
 <input id="confirm_password" name="confirm_password" type="password">
 </p>
 <p>
 <label for="email">Email</label>
 <input id="email" name="email" type="email">
 </p>
 <p>
 <label for="agree">请同意我们的声明</label>
 <input type="checkbox" class="checkbox" id="agree" name="agree">
 </p>
 <p>
 <input class="submit" type="submit" value="提交">
 </p>
 </fieldset>
 </form>

 $(function(){
 $('#commentForm').validate();
 });

$('#commentForm').validate({
 rules: {
 firstname: 'required',//required 表示是必填字段
 lastname: {
 required: true,
 minlength: 3 // 最小长度是3
 }
 }
 });

(1)、required:true 必输字段
(2)、remote:"remote-valid.jsp" 使用ajax方法调用remote-valid.jsp验证输入值
(3)、email:true 必须输入正确格式的电子邮件
(4)、url:true 必须输入正确格式的网址
(5)、date:true 必须输入正确格式的日期，日期校验ie6出错，慎用
(6)、dateISO:true 必须输入正确格式的日期(ISO)，例如：2009-06-23，1998/01/22 只验证格式，不验证有效性
(7)、number:true 必须输入合法的数字(负数，小数)
(8)、digits:true 必须输入整数
(9)、creditcard:true 必须输入合法的信用卡号
(10)、equalTo:"#password" 输入值必须和#password相同
(11)、accept: 输入拥有合法后缀名的字符串（上传文件的后缀）
(12)、maxlength:5 输入长度最多是5的字符串(汉字算一个字符)
(13)、minlength:10 输入长度最小是10的字符串(汉字算一个字符)
(14)、rangelength:[5,10] 输入长度必须介于 5 和 10 之间的字符串")(汉字算一个字符)
(15)、range:[5,10] 输入值必须介于 5 和 10 之间
(16)、max:5 输入值不能大于5
(17)、min:10 输入值不能小于10

$(function(){
 $('#commentForm').validate({
 rules: {
 firstname: {
 required: true,
 minlength: 5
 },
 lastname: "required",
 username: {
 required: true,
 rangelength: [4,6]
 },
 password: {
 required: true,
 minlength: 4,
 number: true
 },
 confirm_password: {
 required: true,
 minlength: 3,
 equalTo: '#password'
 },
 email: {
 required: true,
 email: true
 },
 }
 });
 });

required: "这是必填字段",
 remote: "请修正此字段",
 email: "请输入有效的电子邮件地址",
 url: "请输入有效的网址",
 date: "请输入有效的日期",
 dateISO: "请输入有效的日期 (YYYY-MM-DD)",
 number: "请输入有效的数字",
 digits: "只能输入数字",
 creditcard: "请输入有效的信用卡号码",
 equalTo: "你的输入不相同",
 extension: "请输入有效的后缀",
 maxlength: $.validator.format("最多可以输入 {0} 个字符"),
 minlength: $.validator.format("最少要输入 {0} 个字符"),
 rangelength: $.validator.format("请输入长度在 {0} 到 {1} 之间的字符串"),
 range: $.validator.format("请输入范围在 {0} 到 {1} 之间的数值"),
 max: $.validator.format("请输入不大于 {0} 的数值"),
 min: $.validator.format("请输入不小于 {0} 的数值")

$('#commentForm').validate({
 rules: {
 firstname: {
 required: true,
 minlength: 5
 },
 lastname: "required",
 username: {
 required: true,
 rangelength: [4,6]
 },
 password: {
 required: true,
 minlength: 4,
 number: true
 },
 confirm_password: {
 required: true,
 minlength: 3,
 equalTo: '#password'
 },
 email: {
 required: true,
 email: true
 }
 },
 messages: {
 firstname: "请输入您的名字",
 lastname: "请输入您的姓氏",
 username: {
 required: "请输入用户名",
 minlength: "用户名必需由两个字母组成"
 },
 password: {
 required: "请输入密码",
 minlength: "密码长度不能小于 5 个字母"
 },
 confirm_password: {
 required: "请输入密码",
 minlength: "密码长度不能小于 5 个字母",
 equalTo: "两次密码输入不一致"
 },
 email: "请输入一个正确的邮箱",
 }
 });

$('#commentForm').validate({
 submitHandler: function(){
 alert("提交事件成功");
 from.submit();
 }
 });

 $.validate.setDefaults({
 submitHandler: function(){
 alert("提交成功！");
 form.submit();
 }
 });

 $(function(){
 $("#commentForm").validate({
 debug:true;
 });
 });

 errorPlacement: function(error, element) { 
 error.appendTo(element.parent()); 
 }

 errorPlacement: function(error,element){
 $(element).closest('form').find('label[for="'+ element.attr("id") +'"]').append(error);
 },

 errorElement: 'span',
 errorClass: 'commentError',
 errorLabelContainer: $('form div.error'),
 wrapper: 'li',

input.error { border: 1px solid red; }
 label.error {
 background:url("demo/images/unchecked.gif") no-repeat 0px 0px;
 padding-left: 16px;
 padding-bottom: 2px;
 font-weight: bold;
 color: #EA5200;
 }
 label.checked {
 background:url("demo/images/checked.gif") no-repeat 0px 0px;
 }

 success: function(){
 alert(1);
 },

 $.validator.addMethod("isZipCode", function(value, element) { 
 var tel = /^[0-9]{6}$/;
 return this.optional(element) || (tel.test(value));
 }, "请正确填写您的邮政编码");

 zipcode: {
 required: true,
 isZipCode :true
 }