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//获取某年每个月的天数
function getMonthDays(year) {
var feb = ((0 == year % 4) && (0 != (year % 100))) || (0 == year % 400) ? 29 : 28;
return new Array(31, feb, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
}
var date = new Date();
var monthFirstDay = new Date(date.getFullYear(), date.getMonth(), 1); //月的第一天
var daysOfMonth = getMonthDays(date.getFullYear())[date.getMonth()]; //查询月的天数
var startDay = monthFirstDay.getDay();//获取本月的第一天是星期几
alert(monthFirstDay);
alert(daysOfMonth );
alert(startDay);