<html></p><p><head></p><p><title></title><br /><mce:script type="text/javascript"><!--<br /> function init()<br /> {<br /> var year=$("year");<br /> var month=$("month");<br /> var day=$("day");<br /> //var mvalue=$("month").value;//提到月份的值<br /> /////顯示年////<br /> for (var i=1980;i<=2010;i++)<br /> {<br /> var op=new Option(i,i);<br /> year.options.add(op);<br /> }<br /> ////顯示月////////////<br /> for (var i=1;i<=12;i++)<br /> {<br /> var op=new Option(i,i);<br /> month.options.add(op);<br /> }<br /> for (var i=1;i<=31;i++)<br /> {<br /> var op=new Option(i,i);<br /> day.options.add(op);<br /> }<br /> }<br /> function changeDay()<br /> {<br /> var day=$("day");<br /> var mvalue=$("month").value;//提到月份的值<br /> var arr1=new Array("4","6","9","11");<br /> var arr2=new Array("1","3","5","7","8","10","12");<br /> ////迴圈數組看是否使用者選擇的值,<br /> ///////30天<br /> for (var i=0;i<arr1.length;i++)<br /> {<br /> if(mvalue==arr1[i])<br /> {<br /> day.options.length=0;//清空值<br /> for (var j=1;j<=30;j++)<br /> {<br /> var op1=new Option(j,j);<br /> day.options.add(op1);<br /> }</p><p> }<br /> }<br /> ////////////31天///<br /> for (var i=0;i<arr2.length;i++)<br /> {<br /> if(mvalue==arr2[i])<br /> {<br /> day.options.length=0;//清空值<br /> for (var j=1;j<=31;j++)<br /> {<br /> var op1=new Option(j,j);<br /> day.options.add(op1);<br /> }</p><p> }<br /> }<br /> ///////////瑞年29天,平年28天<br /> if(mvalue==2)<br /> {<br /> var yr=$("year").value;<br /> if(yr%4==0&&yr%100!=0||yr%400==0)<br /> {<br /> day.options.length=0;//清空值<br /> for (var j=1;j<=29;j++)<br /> {<br /> var op1=new Option(j,j);<br /> day.options.add(op1);<br /> }<br /> }else<br /> {<br /> day.options.length=0;//清空值<br /> for (var j=1;j<=28;j++)<br /> {<br /> var op1=new Option(j,j);<br /> day.options.add(op1);<br /> }<br /> }<br /> }<br /> }</p><p> function $(str)<br /> {<br /> return document.getElementById(str);<br /> }<br />// --></mce:script><br /></head></p><p><body onload="init()"><br /> 請選擇:<select id="year"></select>年 <select id="month" onchange="changeDay()"></select>月<select id="day"></select>日<br /></body></p><p></html><br />