javascript实现年月日的联动选择
<script type="text/javascript">
function dayChange(year,month,day){
var selectYear = document.getElementById(year);
var selectMonth = document.getElementById(month);
var selectDay = document.getElementById(day);
var y = selectYear.value,m = selectMonth.value,d = selectDay.value;
if(m==4||m==6||m==9||m==11){
if(selectDay.length == 31){
selectDay.options.remove(30);
}
if(selectDay.length == 29){
selectDay.options.add(30,30);
}
if(selectDay.length == 28){
selectDay.options.add(29,29);
selectDay.options.add(30,30);
}
}
if(m==1||m==3||m==5||m==7||m==8||m==10||m==12){
if(selectDay.length == 30){
selectDay.options.add(new Option(31,31));
}
if(selectDay.length == 29){
selectDay.options.add(new Option(30,30));
selectDay.options.add(new Option(31,31));
}
if(selectDay.length == 28){
selectDay.options.add(new Option(29,29));
selectDay.options.add(new Option(30,30));
selectDay.options.add(new Option(31,31));
}
}
if(m==2){
if(isRunYear(y)){
if(selectDay.length == 31){
selectDay.options.remove(30);
selectDay.options.remove(29);
}
if(selectDay.length == 30){
selectDay.options.remove(29);
}
if(sele
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