`

JS计算月份里每周的开始日期和结束日期及工作日

javascript 
阅读更多 
<HTML>
<HEAD>
<meta http-equiv="content-type" content="text/html; charset=gb2312"><meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />

<script type="text/javascript">

function show(year,month) {
 var week = showWeekDate(year,month);
 
 document.writeln("周起始时间"+week.week1.start+"-"+week.week1.end+"  工作日"+week.week1.workDays+"<br/>");
       document.writeln("周起始时间"+week.week2.start+"-"+week.week2.end+"  工作日"+week.week2.workDays+"<br/>");
      document.writeln("周起始时间"+week.week3.start+"-"+week.week3.end+"  工作日"+week.week3.workDays+"<br/>");
      document.writeln("周起始时间"+week.week4.start+"-"+week.week4.end+"  工作日"+week.week4.workDays+"<br/>");
      document.writeln("周起始时间"+week.week5.start+"-"+week.week5.end+"  工作日"+week.week5.workDays+"<br/>");

 if(week.hasOwnProperty("week6"))
   {    
document.writeln("周起始时间"+week.week6.start+"-"+week.week6.end+"  工作日"+week.week6.workDays+"<br/>");
 }
}

function showWeekDate(year,month)
{ 
 var date = new Date();
 if (year.length > 0 && month.length > 0 ) 
  {
  date = new Date(year,month-1,1);
  } else {
  date = new Date(date.getFullYear(),date.getMonth(),1);
  }
  
 var week = new Object;
 week.week1 = new Object;
 week.week2 = new Object;
 week.week3 = new Object;
 week.week4 = new Object;
 week.week5 = new Object;
 
 //本月第一天是周几 
 week.today = date.getDay();
 if (week.today == 0) 
 {
  date.setDate(date.getDate()+1);
  week.today = date.getDay();
 }
 
 //本月第一周工作日
 week.week1.workDays = 5-week.today+1;
 if (week.week1.workDays<0) week.week1.workDays=0;
 //本月第一周起始日期
 week.week1.start = date.getDate()+"/"+(date.getMonth()+1);
 //本月第一周结束日期
 date.setDate(date.getDate()+(1+week.week1.workDays));
 week.week1.end = date.getDate()+"/"+(date.getMonth()+1);

 
        //本月第二周起始日期
 date.setDate(date.getDate()+1);
 week.week2.workDays = 5;
 week.week2.start = date.getDate()+"/"+(date.getMonth()+1);
 //本月第二周结束日期
 date.setDate(date.getDate()+(1+week.week2.workDays));
 week.week2.end = date.getDate()+"/"+(date.getMonth()+1);

 
 //本月第三周起始日期
 date.setDate(date.getDate()+1);
 week.week3.workDays = 5;
 week.week3.start = date.getDate()+"/"+(date.getMonth()+1);
 //本月第三周结束日期
 date.setDate(date.getDate()+(1+week.week3.workDays));
 week.week3.end = date.getDate()+"/"+(date.getMonth()+1);


 //本月第四周起始日期
 date.setDate(date.getDate()+1);
 week.week4.workDays = 5;
 week.week4.start = date.getDate()+"/"+(date.getMonth()+1);
 //本月第四周结束日期
 date.setDate(date.getDate()+(1+week.week4.workDays));
 week.week4.end = date.getDate()+"/"+(date.getMonth()+1);


 date.setDate(date.getDate()+1);
 week.week5.start = date.getDate()+"/"+(date.getMonth()+1);
 
 //计算月底日期 
        var nextMonth = new Date(date.getFullYear(),date.getMonth()+1,1);
 var monthLastDay = new Date(nextMonth-86400000); 
 
 date.setDate(date.getDate()+6);
      if (date <= monthLastDay)
 {
  week.week5.workDays = 5;
  week.week5.end = date.getDate()+"/"+(date.getMonth()+1); 
  if (date < monthLastDay) {
   week.week6 = new Object;
   date.setDate(date.getDate()+1);
   week.week6.start = date.getDate()+"/"+(date.getMonth()+1);
   week.week6.end = monthLastDay.getDate()+"/"+(date.getMonth()+1);
   week.week6.workDays = monthLastDay.getDay();
  }
 } else {
  week.week5.end = monthLastDay.getDate()+"/"+(monthLastDay.getMonth()+1);
  week.week5.workDays = monthLastDay.getDay();
  if (week.week5.workDays >5 ) week.week5.workDays = 5;   
 }
 return week;
}



</script>

</HEAD>
<body>
   Year:<input type="text" id="year" value="2011"/>
   Month:<input type="text" id="month" value="8"/>
   <input type="button" value="show" onclick="javascript:show(document.getElementById('year').value,document.getElementById('month').value)"/>
</body>
</html>

 

 运行结果：

 

 周起始时间1/8-7/8 工作日5
周起始时间8/8-14/8 工作日5
周起始时间15/8-21/8 工作日5
周起始时间22/8-28/8 工作日5
周起始时间29/8-31/8 工作日3

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| JavaScrip常用日期操作
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