angular4 获取当前日期（年月日） 根据当前日期判断星期几

ngOnInit(): void {this.now = new Date();this.week = this.transform(this.now);}//获取当前时间 判断是星期几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;}}