根据日期判断出星期

function getWeekString(date){
	if(!date)
		return '';
	var WeekArr = ["星期天", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];
	var nowDayOfWeek = date.getDay(); 
	return WeekArr[nowDayOfWeek];
	
}