moment获取当前年、月、周的第一天和最后一天

moment获取当前年、月、周的第一天和最后一天

<u-icon class="icon-font" name="arrow-left" color="#ccc" size="15"
 									@click="switch_month_week('prev',true)"></u-icon>
 		<view class="title">{
   
   {datatime[0]}}-{
   
   {datatime[1]}}</view>
 								<u-icon class="icon-font" name="arrow-right" color="#ccc" size="15"
 									@click="switch_month_week('next',true)"></u-icon>

getdatatime(i, type) {
    
    
				// i：用户上一个月下一个也，type：获取的类型，年月周
 				if (type == "week") {
    
    
 					let weekOfDay = parseInt(moment().format('E')); //计算今天是这周第几天
 					let last_monday = moment().subtract(weekOfDay + 7 * i - 1, 'days').format('YYYY/MM/DD'); //周一日期
 					let last_sunday = moment().subtract(weekOfDay + 7 * (i - 1), 'days').format('YYYY/MM/DD'); //周日日期
 					return [last_monday, last_sunday]
 				} else if (type == "month") {
    
    
 					let startEndTime1 = moment().startOf("month").subtract(i, 'months').format('YYYY/MM/DD')
 					let startEndTime2 = moment().endOf("month").subtract(i, 'months').format('YYYY/MM/DD')
 					
 					return [startEndTime1, startEndTime2]

 				} else if (type == "year") {
    
     
 					let startDate = moment().startOf('year').format('YYYY/MM/DD')
 					let endDate = moment().endOf('year').format('YYYY/MM/DD')
 					return [startDate, endDate]
 				}

 			},


			// nowTime：默认是0，当前年/月/周
 			switch_month_week(type = 'next') {
    
    
 				if (type == 'prev') {
    
    
 					this.nowTime = this.nowTime + 1
 				} else if (type == 'next') {
    
    
 					this.nowTime = this.nowTime - 1
 				}
				// 调用函数获取到年月周欧
 				this.datatime = this.getdatatime(this.nowTime, this.timetype)  
 			},