angular4，擷取目前日期（年月日），根據目前日期判斷星期幾

ngOnInit(): void {
    this.now = new Date();
    this.week = this.transform(this.now);
}



//擷取目前時間 判斷是星期幾
  transform(value: any): any {
    if (value !== undefined) {
      let weekArray = new Array('周日', '周一', '周二', '周三', '周四', '周五', '周六');
      let myDate = new Date(value);
      let week = weekArray[myDate.getDay()];
      return week;
    }
  }