jquery validate 表单验证 写到控件中的问题

在用php做项目时, 表单前台的验证用jquery-validate插件,在网上看到教程可以把jquery validate 表单验证规则写到控件中,但是我按照网上的例子写出的代码密码和密码验证部分不正常,不知道问题出在哪里了?<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>表单验证</title>
        <script src="https://cdn.bootcss.com/jquery/1.7.2/jquery.min.js"></script>
        <script src="https://cdn.bootcss.com/jquery-validate/1.17.0/jquery.validate.js"></script>
        <script type="text/javascript" src="https://cdn.bootcss.com/jquery.tablesorter/2.15.6/js/jquery.metadata.js"></script>
    <body>
            <script type="text/javascript">
                $().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="required" />
            </p>
         <p>
          <label for="email">E-Mail</label>
          <input id="email" name="email" class="required email" />
         </p>
         <p>
          <label for="password">Password</label>
          <input id="password" name="password" type="password" class="{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="{required:true,minlength:5,equalTo:'#password'}" />
         </p>
            <p>
                <input class="submit" type="submit" value="Submit"/>
            </p>
        </form>
    </body>
</html>教程原文地址:
http://www.cnblogs.com/jiqing9006/p/3182572.html