jsp 日历的源码(4)

                if (day == "") {

                  form.dayBox[(row*7)+col].style.display = "none";

                } else {

                 form.dayBox[(row*7)+col].value = day;

                 if (col%7 == 0) form.dayBox[(row*7)+col].style.color = "red";

                 if (yearNow == year && monthNow == month && dayNow == day) form.dayBox[(row*7)+col].style.color = "blue";;

               }

            }

        }

    }

    function start_day_in_month ( year, month )   {

        var  day, daynum, ndays, mnum;

        sday = start_day_in_year ( year );

        endDay[2] = ( year % 4 ) ? 28 : 29;

        if ( month == 1 )

            daynum = sday;

        else {

            ndays = sday;

            for ( mnum=2; mnum<month+1; mnum++ )

                ndays = ndays + endDay[mnum-1];

            daynum = ndays % 7;

        }

        daynum = (!daynum) ? 7 : daynum;

        return (daynum);

    }

    function start_day_in_year ( year )   {

        var y, m, d;

        var n;

        y = year - 1; m = 13; d = 1;

        n = d + 2 * m + ( Math.floor ( ( 0.6 + (m + 1) ) ) + y );

        n = n + Math.floor ( ((y / 4) - Math.floor ( (y / 100 ) ) + Math.floor ( ( y / 400 ) ) )                                                                               ) + 2 ;