js 日期获取星期几

 //获取星期几
 function getWeek(num){
  var a = ['星期日', '星期一','星期二','星期三','星期四','星期五','星期六'];
  return a[num];
 }
 
 //获取指定日期是星期几
function getWeekday(sDate){
    var dt = new Date(sDate.replace(/-/g, '/'));
    //var a = ['星期日', '星期一','星期二','星期三','星期四','星期五','星期六'];
	var a = ['0', '1','2','3','4','5','6'];
    return parseInt(a[dt.getDay()]);
}