年月日三联动下拉框
< HTML > < HEAD > < title > 年月日三联动下拉框 </ title > < meta http - equiv = ' Content-Type ' content = ' text/html; charset=gb2312 ' > < meta name = ' author ' content = ' http://singlepine.cnblogs.com/ ' > </ HEAD > < body > < form name = " form1 " > < select name = " YYYY " onchange = " YYYYDD(this.value) " > < option value = "" selected > 请选择 年 </ option > </ select > < select name = " MM " onchange = " MMDD(this.value) " > < option value = "" selected > 选择 月 </ option > </ select > < select name = " DD " > < option value = "" selected > 选择 日 </ option > </ select > </ form > < script language =