js 日期转换如何为星期几

最近在写一个 家政预约系统 里面需要实现下图这样的效果 那就直接上代码

 

var arr = []
			for (let i = 0; i < 7; i++) {
				var now = new Date();
				//24 * 3600 * 1000 就是计算一天的时间  
				var date = new Date(now.getTime() + i * 24 * 3600 * 1000);
				var year = date.getFullYear();
				var month = date.getMonth() + 1;
				var day = date.getDate();
				let da = year + "-" + month + "-" + day
				let data = month + "月" + day + '日'
				var weekArray = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");
				var week = weekArray[new Date(da).getDay()];
				var order = {
					name: '',
					data: ''
				}
				order.name = week
				order.data = data
				this.dateList.push(da)
				arr.push(order)
			}
			this.orderData = arr

里面的this这个自己要定义的哦