用JS计算两个日期之间有多少个休息日

如果把两头的日期都算在内，只计算周六周日的话. 可以这样, 或许还有简单一些的计算方法，不管那么多了，先弄一个能工作的出来再说.

<script type="text/javascript">

function weekendBetween(dtStart, dtEnd) {
     if (typeof dtEnd == 'string' )
         dtEnd = StringToDate(dtEnd);
     if (typeof dtStart == 'string' )
         dtStart = StringToDate(dtStart);

     var days = parseInt((dtEnd - dtStart) / 86400000);
     var adds = 0;
     var m = (days+ dtStart.getDay() +1) % 7;
     if(m > 0)
        adds = m;
     if(m >2)
        adds = 2;

     var redu = 0
     if(dtStart.getDay() > 0)
        redu = 2;
     if(dtStart.getDay() ==1)
        redu =1;

     var subtotal = parseInt((days + dtStart.getDay() +1)/7)*2;
    return subtotal - redu + adds;

}
function StringToDate(DateStr)
{
     var converted = Date.parse(DateStr);
     var myDate = new Date(converted);
    if (isNaN(myDate))
     {
         var arys= DateStr.split('-');
         myDate = new Date(arys[0],arys[1],arys[2]);
     }
     return myDate;
}

alert("2-1~~~~2-18");
alert(weekendBetween(new Date(2008,2,1), new Date(2008,2,18)));

alert("2-1~~~~2-15, 字符型参数");
alert(weekendBetween("2008-2-1","2008-2-15"));

alert("2-1~~~~2-16, 字符型参数");
alert(weekendBetween("2008-2-1","2008-2-16"));

alert("2-1~~~~2-17, 字符型参数");
alert(weekendBetween("2008-2-1","2008-2-17"));

alert("2-3~~~~2-16, 字符型参数");
alert(weekendBetween("2008-2-3","2008-2-16"));

</script>

Tag标签: javascript