基于jquery.validate.min.js，添加自定义的check方法，实例如下：

	jQuery.validator.addMethod("ip", function (b, a) {
		return this.optional(a) || (/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/.test(b) && (RegExp.$1 < 256 && RegExp.$2 < 256 && RegExp.$3 < 256 && RegExp.$4 < 256));
	}, "\u8bf7\u8f93\u5165\u6b63\u786e\u7684IP\u5730\u5740");
	jQuery.validator.addMethod("busirequired", function (b, a) {
		return b && jQuery.trim(b) != "" && b != "-1";
	}, "\u8bf7\u9009\u62e9\u6b63\u786e\u7684\u9009\u9879");