注意：在使用equalTo关键字时，后面的内容必须加上引号，如下代码：
class=”{required:true,minlength:5,equalTo:’#password’}”
另外一个方式，使用关键字：meta
例如，将上面示例中的代码改为关键字meta形式，代码如下：
<meta http-equiv=”Content-Type” content=”text/html; charset=UTF-8″ />
<script language=”JavaScript” type=”text/JavaScript” src=”jquery-1.6.1.js”></script>
<script language=”JavaScript” type=”text/JavaScript” src=”jquery.validate.min.js”></script>
<script language=”JavaScript” type=”text/JavaScript” src=”jquery.metadata.js”></script>
<script>
$().ready(function() {
$(“#signupForm”).validate({meta: “validate”});
});
</script>
<form id=”signupForm” method=”get” action=””>
<p>
<label for=”firstname”>Firstname</label>
<input id=”firstname” name=”firstname” class=”{validate:{required:true,minlength:5,messages:{required:’请输入内容’,minlength:’字符串长度不能小于5′}}}” />
<p>
<label for=”email”>E-Mail</label>
<input id=”email” name=”email” class=”{validate:{required:true, email:true}}” />
</p>
<p>
<label for=”password”>Password</label>
<input id=”password” name=”password” type=”password” class=”{validate:{required:true,minlength:5}}” />
</p>
<p>
<label for=”confirm_password”>确认密码</label>
<input id=”confirm_password” name=”confirm_password” type=”password” class=”{validate:{required:true,minlength:5,equalTo:’#password’}}” />
</p>
<p>
<input class=”submit” type=”submit” value=”Submit”/>
</p>
</form>
注意：
规则部分应用完整形式，如下所示：
正确写法：
<input id=”email” name=”email” class=”{validate:{required:true, email:true}}” />
错误写法：
<input id=”email” name=”email” class=”{validate:{required email}}” />
再有一种方式
$.metadata.setType(“attr”, “validate”);
