jQuery.validator.addMethod("alphanumeric", function(value, element) {
	return this.optional(element) || /^[a-zA-Z0-9]+$/i.test(value);
}, "只允许英文字母和数字");
jQuery.validator.addMethod("notnumeric", function(value, element) {
	return this.optional(element) || !/^[0-9]+$/i.test(value);
}, "不允许纯数字");