function window.onload()
{
strYYYY = document.form1.YYYY.outerHTML;
strMM = document.form1.MM.outerHTML;
strDD = document.form1.DD.outerHTML;
MonHead = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];


//先给年下拉框赋内容
var y = new Date().getFullYear();
var str = strYYYY.substring(0, strYYYY.length - 9);
for (var i = (y-40); i < (y+10); i++) //以今年为准，前30年，后30年
{
str += "<option value='" + i + "'> " + i + "</option>\r\n";
}
document.form1.YYYY.outerHTML = str +"</select>";

//赋月份的下拉框
var str = strMM.substring(0, strMM.length - 9);
for (var i = 1; i < 13; i++)
{
str += "<option value='" + i + "'> " + i + "</option>\r\n";
}
document.form1.MM.outerHTML = str +"</select>";

document.form1.YYYY.value = y;
document.form1.MM.value = new Date().getMonth() + 1;
var n = MonHead[new Date().getMonth()];
if (new Date().getMonth() ==1 && IsPinYear(document.form1.YYYY.value)) n++;

writeDay(n); //赋日期下拉框

document.form1.DD.value = new Date().getDate();
}

function YYYYMM(str) //年发生变化时日期发生变化(主要是判断闰平年)
{
var MMvalue = document.form1.MM.options[document.form1.MM.selectedIndex].value;
if (MMvalue == ""){DD.outerHTML = strDD; return;}
var n = MonHead[MMvalue - 1];
if (MMvalue ==2 && IsPinYear(str)) n++;
writeDay(n)
}
function MMDD(str) //月发生变化时日期联动
{
var YYYYvalue = document.form1.YYYY.options[document.form1.YYYY.selectedIndex].value;
if (str == ""){DD.outerHTML = strDD; return;}
var n = MonHead[str - 1];
if (str ==2 && IsPinYear(YYYYvalue)) n++;
writeDay(n)
}
function writeDay(n) //据条件写日期的下拉框
{
var s = strDD.substring(0, strDD.length - 9);
for (var i=1; i<(n+1); i++)
s += "<option value='" + i + "'> " + i + "</option>\r\n";
document.form1.DD.outerHTML = s +"</select>";
}
function IsPinYear(year)//判断是否闰平年
{ return(0 == year%4 && (year%100 !=0 || year%400 == 0))}






function online2()
{
strYYYY = document.form1.YYYY1.outerHTML;
strMM = document.form1.MM1.outerHTML;
strDD = document.form1.DD1.outerHTML;
MonHead = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

//先给年下拉框赋内容
var y = new Date().getFullYear();
var str = strYYYY.substring(0, strYYYY.length - 9);
for (var i = (y-40); i < (y+10); i++) //以今年为准，前30年，后30年
{
str += "<option value='" + i + "'> " + i + "</option>\r\n";
}
document.form1.YYYY1.outerHTML = str +"</select>";

//赋月份的下拉框
var str = strMM.substring(0, strMM.length - 9);
for (var i = 1; i < 13; i++)
{
str += "<option value='" + i + "'> " + i + "</option>\r\n";
}
document.form1.MM1.outerHTML = str +"</select>";

document.form1.YYYY1.value = y;
document.form1.MM1.value = new Date().getMonth() + 1;
var n = MonHead[new Date().getMonth()];
if (new Date().getMonth() ==1 && IsPinYear2(document.form1.YYYY1.value)) n++;

writeDay2(n); //赋日期下拉框
//alert(document.form1.DD1.value)
document.form1.DD1.value = new Date().getDate();
}

function YYYYMM2(str) //年发生变化时日期发生变化(主要是判断闰平年)
{
var MMvalue = document.form1.MM1.options[document.form1.MM1.selectedIndex].value;
if (MMvalue == ""){DD1.outerHTML = strDD; return;}
var n = MonHead[MMvalue - 1];
if (MMvalue ==2 && IsPinYear2(str)) n++;
writeDay2(n)
}
function MMDD2(str) //月发生变化时日期联动
{
var YYYYvalue = document.form1.YYYY1.options[document.form1.YYYY1.selectedIndex].value;
if (str == ""){DD1.outerHTML = strDD; return;}
var n = MonHead[str - 1];
if (str ==2 && IsPinYear2(YYYYvalue)) n++;
writeDay2(n)
}
function writeDay2(n) //据条件写日期的下拉框
{
var s = strDD.substring(0, strDD.length - 9);
for (var i=1; i<(n+1); i++)
s += "<option value='" + i + "'> " + i + "</option>\r\n";
document.form1.DD1.outerHTML = s +"</select>";
}
function IsPinYear2(year)//判断是否闰平年
{ return(0 == year%4 && (year%100 !=0 || year%400 == 0))}





function online3()
{
strYYYY = document.form1.YYYY3.outerHTML;
strMM = document.form1.MM3.outerHTML;

//先给年下拉框赋内容
var y = new Date().getFullYear();
var str = strYYYY.substring(0, strYYYY.length - 9);
for (var i = (y-40); i < (y+10); i++) //以今年为准，前30年，后30年
{
str += "<option value='" + i + "'> " + i + "</option>\r\n";
}
document.form1.YYYY3.outerHTML = str +"</select>";

//赋月份的下拉框
var str = strMM.substring(0, strMM.length - 9);
for (var i = 1; i < 13; i++)
{
str += "<option value='" + i + "'> " + i + "</option>\r\n";
}
document.form1.MM3.outerHTML = str +"</select>";
document.form1.YYYY3.value = y;
document.form1.MM3.value = new Date().getMonth() + 1;
}