JQuery的有效行验证怎么写

$("#signupForm").validate(
	  {//这里用大括号包含了一个键值对，里面包含两个参数
	  //分别是规则Rules和Message信息
		  rules: 
		  {
		  //规则里面有键值对，键值之间用冒号，这个键就是前台代码里面的自定义属性type的值，键就是默认校验规则
		  //键如果不是一个规则，好几个的时候，使用大括号{规则：值，规则：值}
			  firstname: "required",lastname: "required",
			  username: {required: true,minlength: 2},
			  password: {required: true,minlength: 5},
			  confirm_password: {required: true,minlength: 5,equalTo: "#password"},
			  email: {required: true,email: true},
			  topic: {required: "#newsletter:checked",minlength: 2},
			  agree: "required"
		  },
		  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",
			  agree: "请接受我们的声明",
			  topic: "请选择两个主题"
		  }
    }
  )