//年，月，返回周列表
function getInfo(year, month) {
var d = new Date()
// what day is first day
d.setFullYear(year, month-1, 1)
var w1 = d.getDay()
if (w1 == 0) w1 = 7
// total day of month
d.setFullYear(year, month, 0)
var dd = d.getDate()
// first Monday
if (w1 != 1) d1 = 7 - w1 + 2
else d1 = 1
week_count = Math.ceil((dd-d1+1)/7)
//document.write(year + "年" + month + "月有" + week_count +"周<br/>")
var zhou_arr = []
for (var i = 0 i < week_count i++) {
var monday = d1+i*7
var sunday = monday + 6
var from = year+"-"+month+"-"+monday
var to
if (sunday <= dd) {
to = year+"-"+month+"-"+sunday
} else {
d.setFullYear(year, month-1, sunday)
to = d.getFullYear()+"-"+(d.getMonth()+1)+"-"+d.getDate()
}
zhou_arr.unshift(from + "|" + to)
//document.write("第"+(i+1)+"周 从" + from + " 到 " + to + "<br/>")
}
return zhou_arr
}
function YMDinfo(ymd){
var arr = new Array()
var arr = ymd.split("|")
return arr[0].split("-")[1] + "月" + arr[0].split("-")[2] + "日" + "-" + arr[1].split("-")[1] + "月" + arr[1].split("-")[2] + "日"
}
function zhou(z){
// var d=new Date(z)
// var yt=( ( z%4==0 && z%100!=0) || z%400==0)?366:365
// week_count = Math.ceil((yt-d.getDay())/7.0)
var week_arr = []
for(var i=12 i>0 i--){
week_arr.unshift(getInfo(z, i))
}
//定义空字符串
var str_week = []
for(var j=week_arr.length-1 j>=0 j--){
for(var o=0 o<week_arr[j].length o++){
// console.log(week_arr[j][o])
str_week.unshift(week_arr[j][o])
}
}
var option_list = ''
for(var f=str_week.length-1 f>=0 f--){
// console.log(str_week[f].split("|")[0])
var option = '<option from='+str_week[f].split("|")[0]+" to="+str_week[f].split("|")[1]+" type=2 ext="+(f+1)+">第"+(f+1)+"周 "+ YMDinfo(str_week[f]) +"</option>"
option_list += option
}
return option_list
// console.log(option_list)
// <option from="2016-08-08" to="2016-08-15" type="2" ext="33">第33周 8月8日-8月14日</option>
}
<html><head>
<title>年月日三下拉框联动</title>
<meta http-equiv='Content-Type' content='text/htmlcharset=gb2312'>
</head>
<body>
<form name=form1>
<select name=YYYY onchange="YYYYMM(this.value)">
<option value="">年</option>
</select>
<select name=MM onchange="MMDD(this.value)">
<option value="">月</option>
</select>
<select name=DD>
<option value="">日</option>
</select>
</form>
<script language="JavaScript">
window.onload = function(){
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-30)i <(y+30)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 = 1i <13i++)
{
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(YYYYvalue)) 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 = strDDreturn}
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 = strDDreturn}
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=1i<(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))}
//--></script>
</body>
</html>
