计算日期替当年的第几周（javascript）
日期：2014-05-16 浏览次数：20361 次
计算日期为当年的第几周（javascript）
早期写个一个算法，虽然写的不是很好，但挺有用的，拿出来分享一下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题 1</title>
<script type="text/javascript">
function shipweek(datestr)
{
var datestr=datestr;
var strdate=datestr.split(" ")[0];
strdate=strtodateline(strdate);
var shipweek;
var numdate=strdate.getTime();
var nowyear=strdate.getYear();
var firstday=new Date(nowyear,0,1);
if((firstday.getDay()<5)&(firstday.getDay()!=0)){
firstday.setTime(firstday.getTime()-firstday.getDay()*24*60*60*1000);}
else{ if(firstday.getDay()==0){firstday.setTime(firstday.getTime()+0*24*60*60*1000);}
else{firstday.setTime(firstday.getTime()+(7-firstday.getDay())*24*60*60*1000);}
}
var lastday=new Date(nowyear,11,31);
var weeknum=Math.ceil((strdate.getTime()-firstday.getTime())/(7*24*60*60*1000));
if((weeknum<10)&(weeknum!=0)){shipweek="Y"+nowyear+"W0"+weeknum;}
else{shipweek="Y"+nowyear+"W"+weeknum;}
if(weeknum == 0){
if(shipweek2((nowyear-1)+"-"+12+"-"+31)==53){
if(strdate.getMonth()==0){
shipweek="Y"+eval(nowyear-1)+"W53";
}else
{
shipweek="Y"+nowyear+"W53";
}
}
else{
if(strdate.getMonth()==0){
shipweek="Y"+eval(nowyear-1)+"W52";
}else{
shipweek="Y"+nowyear+"W52";
}
}
}
if(weeknum>52){
if(lastday.getDay()>3){
weeknum=53;
if(strdate.getMonth()==0){
shipweek="Y"+eval(nowyear-1)+"W"+weeknum;
}
else{
shipweek="Y"+nowyear+"W"+weeknum;
}
}
else{
shipweek="Y"+eval(nowyear+1)+"W01";
}
}
return shipweek;
}
function shipweek2(datestr)
{
var datestr=datestr;
var strdate=datestr;
strdate=strtodateline(strdate);
var shipweek;
var numdate=strdate.getTime();
var nowyear=strdate.getYear();
var firstday=new Date(nowyear,0,1);
if((firstday.getDay()<5)&(firstday.getDay()!=0)){
firstday.setTime(firstday.getTime()-firstday.getDay()*24*60*60*1000);}
else{firstday.setTime(firstday.getTime()+(7-firstday.getDay())*24*60*60*1000);}
var lastday=new Date(nowyear,11,31);
var weeknum=Math.ceil((strdate.getTime()-firstday.getTime())/(7*24*60*60*1000));
if((weeknum<10)&(weeknum!=0)){shipweek=weeknum;}
else{shipweek=weeknum;}
if(weeknum == 0){shipweek=53;}
if(weeknum>52){
if(lastday.getDay()>3){
weeknum=53;
shipweek=weeknum;
}
else{
shipweek=1;
}
}
return shipweek;
}
//***********************
function shipMonth(datestr)
{
var datestr=datestr;
var strdate=datestr.split(" ")[0];
strdate=strtodateline(strdate);
var shipweek;
var numdate=strdate.getTime();
var nowyear=strdate.getYear();
var nowmonth=strdate.getMonth();
var firstday=new Date(nowyear,nowmonth,1);
if((firstday.getDay(
早期写个一个算法，虽然写的不是很好，但挺有用的，拿出来分享一下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题 1</title>
<script type="text/javascript">
function shipweek(datestr)
{
var datestr=datestr;
var strdate=datestr.split(" ")[0];
strdate=strtodateline(strdate);
var shipweek;
var numdate=strdate.getTime();
var nowyear=strdate.getYear();
var firstday=new Date(nowyear,0,1);
if((firstday.getDay()<5)&(firstday.getDay()!=0)){
firstday.setTime(firstday.getTime()-firstday.getDay()*24*60*60*1000);}
else{ if(firstday.getDay()==0){firstday.setTime(firstday.getTime()+0*24*60*60*1000);}
else{firstday.setTime(firstday.getTime()+(7-firstday.getDay())*24*60*60*1000);}
}
var lastday=new Date(nowyear,11,31);
var weeknum=Math.ceil((strdate.getTime()-firstday.getTime())/(7*24*60*60*1000));
if((weeknum<10)&(weeknum!=0)){shipweek="Y"+nowyear+"W0"+weeknum;}
else{shipweek="Y"+nowyear+"W"+weeknum;}
if(weeknum == 0){
if(shipweek2((nowyear-1)+"-"+12+"-"+31)==53){
if(strdate.getMonth()==0){
shipweek="Y"+eval(nowyear-1)+"W53";
}else
{
shipweek="Y"+nowyear+"W53";
}
}
else{
if(strdate.getMonth()==0){
shipweek="Y"+eval(nowyear-1)+"W52";
}else{
shipweek="Y"+nowyear+"W52";
}
}
}
if(weeknum>52){
if(lastday.getDay()>3){
weeknum=53;
if(strdate.getMonth()==0){
shipweek="Y"+eval(nowyear-1)+"W"+weeknum;
}
else{
shipweek="Y"+nowyear+"W"+weeknum;
}
}
else{
shipweek="Y"+eval(nowyear+1)+"W01";
}
}
return shipweek;
}
function shipweek2(datestr)
{
var datestr=datestr;
var strdate=datestr;
strdate=strtodateline(strdate);
var shipweek;
var numdate=strdate.getTime();
var nowyear=strdate.getYear();
var firstday=new Date(nowyear,0,1);
if((firstday.getDay()<5)&(firstday.getDay()!=0)){
firstday.setTime(firstday.getTime()-firstday.getDay()*24*60*60*1000);}
else{firstday.setTime(firstday.getTime()+(7-firstday.getDay())*24*60*60*1000);}
var lastday=new Date(nowyear,11,31);
var weeknum=Math.ceil((strdate.getTime()-firstday.getTime())/(7*24*60*60*1000));
if((weeknum<10)&(weeknum!=0)){shipweek=weeknum;}
else{shipweek=weeknum;}
if(weeknum == 0){shipweek=53;}
if(weeknum>52){
if(lastday.getDay()>3){
weeknum=53;
shipweek=weeknum;
}
else{
shipweek=1;
}
}
return shipweek;
}
//***********************
function shipMonth(datestr)
{
var datestr=datestr;
var strdate=datestr.split(" ")[0];
strdate=strtodateline(strdate);
var shipweek;
var numdate=strdate.getTime();
var nowyear=strdate.getYear();
var nowmonth=strdate.getMonth();
var firstday=new Date(nowyear,nowmonth,1);
if((firstday.getDay(
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