js 打印今天星期几

//显示今天星期几
         function dayFormat (date) {
         switch (new Date(date).getDay()) {
            case 0:
               return '星期日'
            case 1:
               return '星期一'
            case 2:
               return '星期二'
            case 3:
               return '星期三'
            case 4:
               return '星期四'
            case 5:
               return '星期五'
            case 6:
               return '星期六'
  }
}
     console.log(dayFormat (new Date))