jquery的validate表单验证框架

本文是根据jquery官方的实例做的相应的修改，做这个实例的目的就是当以后项目中遇到表单验证的时候就可以依照本文所写的实例做相应的修改，本文如果有什么不当的地方，麻烦请批评指出，谢谢！
1.先建一个测试页面，必须包括表单：
  导入相应的资源文件：

<link rel="stylesheet" type="text/css" media="screen" href="css/screen.css" />
<script type="text/javascript" src="js/jquery-1.5.1.js"></script>
<script type="text/javascript" src="js/jquery.validate.js"></script>

2.新建规则及设置样式：

<script type="text/javascript">
$.validator.setDefaults({
	submitHandler: function() { alert("submitted!"); }
});

$().ready(function() {
	// 当提交的时候，判断表单内容
	$("#testForm").validate();
	$("#signupForm").validate({
		rules: {
			firstname : "required",
			lastname  : "required",
			username  : {
				required : true,
				minlength: 5,
				maxlength: 10
			},
			email: {
				required: true,
				email: true
			},
			password  : {
				required : true,
				minlength: 5
			},
			confirm_password : {
				required : true,
				minlength: 5,
				equalTo  : "#password"
			},
			topic: {
				required: "#newsletter:checked",
				minlength: 2
			},
			agree : "required"

		},
		
		messages: {
			firstname : {
				required : "姓不能为空！",
			},
			lastname : {
				required : "名不能为空！"
			},
			username : {
				required : "用户名不能为空，且必须在5到10个字符之内!",
				minlength: "用户不能小于5个字符",
				maxlength: "用户名不能大于10个字符"
			},
			password : {
				required  : "请提供一个密码",
				minlength : "密码至少为5个字符以上!"
			},
			confirm_password : {
				required : "确认密码不能为空!",
				minlength: "确认密码也至少为5个字符以上!",
				equalTo  : "两次输入的密码不匹配！"
			},
			email : "请提供个合法的邮箱地址！",
			agree : "请选择是/否同意"
		}
	});
	
	//隐藏主题选项，当主题没有被选中时
	var newsletter = $("#newsletter");
	// 一开始是隐藏选项的
	var inital = newsletter.is(":checked");
	var topics = $("#newsletter_topics")[inital ? "removeClass" : "addClass"]("gray");
	var topicInputs = topics.find("input").attr("disabled", !inital);
	// 显示主题选项，当主题被选中时
	newsletter.click(function() {
		topics[this.checked ? "removeClass" : "addClass"]("gray");
		topicInputs.attr("disabled", !this.checked);
	});
});
</script>

<style type="text/css">
	#testForm { width: 500px; }
	#testForm label { width: 250px; }
	#testForm label.error, #testForm input.submit { margin-left: 253px; }
	#signupForm { width: 670px; }
	#signupForm label.error {
		margin-left: 10px;
		width: auto;
		display: inline;
	}
	#newsletter_topics label.error {
		display: none;
		margin-left: 103px;
	}
	</style>

3.创建两个表单：

	<form class="cmxform" id="testForm" method="post" action="">
		<fieldset>
			<legend>Please provide your name, email address (won't be published) and a comment</legend>
			<p>
				<label for="cname">用户名(*)</label>
				<input id="cname" name="name" class="required" minlength="2" />
			<p>
				<label for="cemail">邮箱(*)</label>
				<input id="cemail" name="email" class="required email" />
			</p>
			<p>
				<label for="ccomment">评论(*)</label>
				<textarea id="ccomment" name="comment" class="required"></textarea>
			</p>
			<p>
				<input class="submit" type="submit" value="Submit"/>
			</p>
		</fieldset>
	</form>
	
	<form class="cmxform" id="signupForm" method="get" action="">
		<fieldset>
			<legend>Validating a complete form</legend>
			<p>
				<label for="firstname">Firstname</label>
				<input id="firstname" name="firstname" />
			</p>
			<p>
				<label for="lastname">Lastname</label>
				<input id="lastname" name="lastname" />
			</p>
			<p>
				<label for="username">Username</label>
				<input id="username" name="username" />
			</p>
			<p>
				<label for="password">Password</label>
				<input id="password" name="password" type="password" />
			</p>
			<p>
				<label for="confirm_password">Confirm password</label>
				<input id="confirm_password" name="confirm_password" type="password" />
			</p>
			<p>
				<label for="email">Email</label>
				<input id="email" name="email" />
			</p>
			<p>
				<label for="agree">Please agree to our policy</label>
				<input type="checkbox" class="checkbox" id="agree" name="agree" />
			</p>
			<p>
				<label for="newsletter">I'd like to receive the newsletter</label>
				<input type="checkbox" class="checkbox" id="newsletter" name="newsletter" />
			</p>
			<fieldset id="newsletter_topics">
				<legend>Topics (select at least two) - note: would be hidden when newsletter isn't selected, but is visible here for the demo</legend>
				<label for="topic_marketflash">
					<input type="checkbox" id="topic_marketflash" value="marketflash" name="topic" />
					Marketflash
				</label>
				<label for="topic_fuzz">
					<input type="checkbox" id="topic_fuzz" value="fuzz" name="topic" />
					Latest fuzz
				</label>
				<label for="topic_digester">
					<input type="checkbox" id="topic_digester" value="digester" name="topic" />
					Mailing list digester
				</label>
				<label for="topic" class="error">Please select at least two topics you'd like to receive.</label>
			</fieldset>
			<p>
				<input class="submit" type="submit" value="Submit"/>
			</p>
		</fieldset>
	</form>

4.下载相应的资源文件：见附件。