javascript之获取当前是第几周
来源：互联网 发布：出境游数据 编辑：程序博客网 时间：2024/04/30 12:41
<!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=gb2312" /><title>获取当前是第几周</title><script type="text/javascript">function getISOYearWeek(date){ var commericalyear=getCommerialYear(date); var date2=getYearFirstWeekDate(commericalyear); var day1=date.getDay(); if(day1==0) day1=7; var day2=date2.getDay(); if(day2==0) day2=7; var d = Math.round((date.getTime() - date2.getTime()+(day2-day1)*(24*60*60*1000)) / 86400000); return Math.ceil(d / 7)+1; } function getYearFirstWeekDate(commericalyear){ var yearfirstdaydate=new Date(commericalyear, 9, 2); var daynum=yearfirstdaydate.getDay(); var monthday=yearfirstdaydate.getDate(); if(daynum==0) daynum=7; if(daynum<=4){ return new Date(yearfirstdaydate.getFullYear(),yearfirstdaydate.getMonth(),monthday+1-daynum); }else{ return new Date(yearfirstdaydate.getFullYear(),yearfirstdaydate.getMonth(),monthday+8-daynum) } } function getCommerialYear(date){ var daynum=date.getDay(); var monthday=date.getDate(); if(daynum==0) daynum=7; var thisthurdaydate=new Date(date.getFullYear(),date.getMonth(),monthday+4-daynum); return thisthurdaydate.getFullYear(); }function getResult(){ var tmp=new Date(); var y=tmp.getFullYear(); var m=tmp.getMonth()+1; var d=tmp.getDate(); date=new Date(y,m,d); var result=getISOYearWeek(date); document.getElementById("result").innerHTML="现在是第"+result+"周";}</script></head><body>第一周开始日期：<input type="text" id="first_year" value="2012"/><input type="text" name="first_month" value="9" /><input type="text" name="first_date" value="2"/><br/><button onclick="getResult()">获取现在是第几周</button><span id="result" style=" color:red; width:150px; margin:0 auto; height:50px;"></span></body></html>
