
实例化示例:
//年月联动
new YMDselect('year1','month1');
new YMDselect('year1','month1',1990);
new YMDselect('year1','month1',1990,2);
//年月日联动
new YMDselect('year1','month1','day1');
new YMDselect('year1','month1','day1',1990);
new YMDselect('year1','month1','day1',1990,2);
new YMDselect('year1','month1','day1',1990,2,10);