uniapp获取上个月、下个月的月初和月末的日期实现

<template>
	<view>
		<button type="" @click="last()">上一月</button>
		<button type="" @click="next()">下一月</button>
		<view class="" >
			{{startDate}}
		</view>
		<view class="">
			{{endDate}}
		</view>
		
	</view>
</template>

<script>
	export default {
		data() {
			return {
				nowDate:"",
				fullYear:"",
				month:"",
				endOfMonth:"",
				endDate:"",
				startDate:""
			}
		},
		onReady() {
			this.nowDate = new Date();
			this.fullYear =  this.nowDate.getFullYear();
			this.month = this.nowDate.getMonth() + 1; // getMonth 方法返回 0-11，代表1-12月
			this.endOfMonth = new Date(this.fullYear, this.month, 0).getDate(); // 获取本月最后一天
			this.endDate = this.getFullDate(this.nowDate.setDate(this.endOfMonth));//当月最后一天
			this.startDate = this.getFullDate(this.nowDate.setDate(1));//当月第一天
			
		},
		methods: {
			getFullDate(targetDate) {
			  var D, y, m, d;
			  if (targetDate) {
			      D = new Date(targetDate);
			      y = D.getFullYear();
			      m = D.getMonth() + 1;
			      d = D.getDate();
			  } else {
			      y = fullYear;
			      m = month;
			      d = date;
			  }
			  m = m > 9 ? m : '0' + m;
			  d = d > 9 ? d : '0' + d;
			  return y + '-' + m + '-' + d;
			},
			last(){
				this.nowDate.setMonth(this.nowDate.getMonth()-1);
				this.startDate = this.nowDate.getFullYear() + "-" + (this.nowDate.getMonth()+1) + "-" + this.nowDate.getDate()
				this.endDate =this.getFullDate(new Date(this.nowDate.getFullYear(), this.nowDate.getMonth() + 1, 0)) 
				
			},
			next(){
				this.nowDate.setMonth(this.nowDate.getMonth()+1);
				this.startDate = this.nowDate.getFullYear() + "-" + (this.nowDate.getMonth()+1) + "-" + this.nowDate.getDate()
				this.endDate =this.getFullDate(new Date(this.nowDate.getFullYear(), this.nowDate.getMonth() + 1, 0))
			}
		},
		
	}
</script>

<style>

</style>