js 获得当前是星期几

function getCurrentWeekName () {
  var weekday = new Array(7)
  
  weekday[0] = "星期日"
  weekday[1] = "星期一"
  weekday[2] = "星期二"
  weekday[3] = "星期三"
  weekday[4] = "星期四"
  weekday[5] = "星期五"
  weekday[6] = "星期六"

  return weekday[new Date().getDay()];
}

alert(getCurrentWeekName());