<SCRIPT LANGUAGE="JavaScript" type="text/javascript">
//获取本周是一年中的第几周
function getWeekOfYear(a, b, c) {
var d1 = new Date(a, b-1, c);
var d2 = new Date(a, 0, 1);
var d = Math.round((d1 - d2) / 86400000);
return Math.ceil((d + ((d2.getDay() + 1) - 1)) / 7);
};
//本周第一天
function showWeekFirstDay(a, b, c) {
var Nowdate=new Date(a, b-1, c);
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
return getDateString(WeekFirstDay);
}
//本周最后一天
function showWeekLastDay(a, b, c) {
var Nowdate=new Date(a, b-1, c);
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);
return getDateString(WeekLastDay);
}
//日期转换成字符串
function getDateString(_date) {
var month = _date.getMonth();
var result = _date.getFullYear() +'-'+ (parseInt(month)+1)+'-'+_date.getDate();
return result;
}
</SCRIPT>
<script language=javascript>
//一天含 86,400,000 毫秒(24* 60 * 60*1000)
//获取本周是一年中的第几周
/*
function getWeekOfYear(date) {
var d1 = date;
var d2 = new Date(date.getFullYear(), 0, 1);
var d = Math.round((d1 - d2) / 86400000);
return Math.ceil((d + ((d2.getDay() + 1) - 1)) / 7);
};
*/
//本周第一天
function showWeekFirstDay()
{
var Nowdate=new Date();
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
return WeekFirstDay;
}
//本周最后一天
function showWeekLastDay()
{
var Nowdate=new Date();
var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);
return WeekLastDay;
}
//上周第一天
function showPreviousFirstWeekDay(firstDay)
{
var WeekFirstDay=(firstDay==null?showWeekFirstDay():firstDay)
return new Date(WeekFirstDay-86400000*7)
}
//上周最后一天
function showPreviousLastWeekDay(firstDay)
{
var WeekFirstDay=(firstDay==null?showWeekFirstDay():firstDay)
return new Date(WeekFirstDay-86400000)
}
//下周第一天
function showNextFirstWeekDay(lastDay)
{
var MonthFirstDay=(lastDay==null?showWeekLastDay():lastDay)
return new Date((MonthFirstDay/1000+86400)*1000)
}
//下周最后一天
function showNextLastWeekDay(lastDay)
{
var MonthFirstDay=(lastDay==null?showWeekLastDay():lastDay)
return new Date((MonthFirstDay/1000+7*86400)*1000)
}
// 计算当前日期在本年度的周数
Date.prototype.getWeekOfYear = function(weekStart) { // weekStart：每周开始于周几：周日：0，周一：1，周二：2 ...，默认为周日
weekStart = (weekStart || 0) - 0;
if(isNaN(weekStart) || weekStart > 6)
weekStart = 0;
var year = this.getFullYear();
var firstDay = new Date(year, 0, 1);
var firstWeekDays = 7 - firstDay.getDay() + weekStart;
var dayOfYear = (((new Date(year, this.getMonth(), this.getDate())) - firstDay) / 86400000) + 1;
return Math.ceil((dayOfYear - firstWeekDays) / 7) + 1;
}
Date.prototype.format=function(fmt) {
var o = {
"M+" : this.getMonth()+1, //月份
"d+" : this.getDate(), //日
"h+" : this.getHours()%12 == 0 ? 12 : this.getHours()%12, //小时
"H+" : this.getHours(), //小时
"m+" : this.getMinutes(), //分
"s+" : this.getSeconds(), //秒
"q+" : Math.floor((this.getMonth()+3)/3), //季度
"S" : this.getMilliseconds() //毫秒
};
var week = {
"0" : "u65e5",
"1" : "u4e00",
"2" : "u4e8c",
"3" : "u4e09",
"4" : "u56db",
"5" : "u4e94",
"6" : "u516d"
};
if(/(y+)/.test(fmt)){
fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));
}
if(/(E+)/.test(fmt)){
fmt=fmt.replace(RegExp.$1, ((RegExp.$1.length>1) ? (RegExp.$1.length>2 ? "u661fu671f" : "u5468") : "")+week[this.getDay()+""]);
}
for(var k in o){
if(new RegExp("("+ k +")").test(fmt)){
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
}
}
return fmt;
}
function getWeeks(num, obj){
var firstDay = showWeekFirstDay();
var lastDay = showWeekLastDay();
var divContent = "";
for(var i=0;i<num;i++){
lastDay = showPreviousLastWeekDay(firstDay);
firstDay = showPreviousFirstWeekDay(firstDay);
var year = lastDay.getFullYear();
var week = lastDay.getWeekOfYear(1);
divContent = "<option year='"+year+"' week='"+week+"'>"+year+"第" +week+ "周("+firstDay.format("yyyy-MM-dd")+"至"+lastDay.format("yyyy-MM-dd")+")</option>"+divContent;
}
firstDay = showWeekFirstDay();
lastDay = showWeekLastDay();
for(var i=0;i<num;i++){
var year = lastDay.getFullYear();
var week = lastDay.getWeekOfYear(1);
if(i!=0) {
divContent = divContent +"<option year='"+year+"' week='"+week+"'>"+ year+"第"+ week +"周("+firstDay.format("yyyy-MM-dd")+"至"+lastDay.format("yyyy-MM-dd")+")</option>";
} else {
divContent = divContent +"<option year='"+year+"' week='"+week+"'>"+ year+"第"+ week +"周("+firstDay.format("yyyy-MM-dd")+"至"+lastDay.format("yyyy-MM-dd")+")</option>";
}
firstDay = showNextFirstWeekDay(lastDay);
lastDay = showNextLastWeekDay(lastDay);
}
divContent = "<select id='yearWeekSelect' onchange='changeYearWeek(this);'>"+divContent+"</select>"
obj.html(divContent);
}
// 修改year、month字段值
function changeYearWeek(obj){
var $option = $(obj).children("option[selected]");
var year = $option.attr("year");
var week = $option.attr("week");
$("#_year").val(year);
$("#_week").val(week);
}
function changeSelected() {
var _year = $("#_year").val();
var _week = $("#_week").val();
$("#yearWeekSelect").children("option").each(function(){
if($(this).attr("year") == _year && $(this).attr("week") == _week) {
$(this).attr("selected", true);
}
})
}
//alert("ss:"+(new Date(2012,0,1).getWeekOfYear(1)));
//new Date(2012,0,1).getWeekOfYear(1)
</script>