js取两日期差，包含周六周日？

function date()
    {
      var start=new Date("2010/8/1");
      var end = new Date("2010/8/10");
      var allDay = parseInt(end - start) / (24 * 60 * 60 * 1000) + 1;
      var weekday = 0;
      for (var i = 1; i < allDay+1; i++) {
          var time = new Date(start.getYear(), start.getMonth(), start.getDate() + i);
          if (time.getDay() == 0 || time.getDay() == 6) {
              weekday++;
          }
		alert(time.getYear()+'-'+time.getMonth()+'-'+time.getDate()); 
      }
      alert(allDay); //10
      alert(weekday); //3
      alert(allDay-weekday);  //7
    }