获取近一周，近30天，近半年的时间段。

<template>
  <div class="daytiem">
    <p @click="latestTime('7')">近一周</p>
    <p @click="latestTime('30')">近30天</p>
    <p @click="latestTime('180')">近半年</p>
  </div>
</template>

latestTime(value) {
  this.dayval = value
  var date = new Date()
  date= date.valueOf()
  date= date- value * 24 * 60 * 60 * 1000
  date= new Date(date)
  const month = (date.getMonth() + 1) < 10 ? '0' + (date.getMonth() + 1) : (date.getMonth() + 1)
  const datadays = (date.getDate() < 10) ? '0' + date.getDate() : date.getDate()
  console.log(date.getFullYear() + '-' + month + '-' + datadays)
}