小程序中设置缓存过期的实现方法

{
  "start": "2019/10/08 00:00:00",
  "end": "2019/10/30 23:59:59",
  "ads": [
    {
      "image": "xxxx",
      "uri": "wechat:zhizhuxy666"
    },
    {
      "image": "xxx",
      "uri": "wechat:zhizhuxy666"
    }
  ]
}

const startTempStamp = new Date(item.start).getTime()    
const endTempStamp = new Date(item.end).getTime()
const oneDayTempStamp = 24 * 60 * 60 * 1000   // 一天的时间戳
const now = (new Date('2019/09/28 00:00:01')).getTime()

const allDay = Math.ceil((endTempStamp - startTempStamp) / oneDayTempStamp)
const currentDay = Math.ceil((now - startTempStamp) / oneDayTempStamp)

if (now > startTempStamp && now < endTempStamp) {
  ... //下面弹窗逻辑的实现
}else {
  this.setData!({showAdvert: false})
  wx.setStorageSync('showAdvert', false) 
}

const table = []
for (let i = 1; i <= allDay; i++) {
  table.push(startTempStamp + oneDayTempStamp * i)
}
if (now > table[currentDay - 2]) {
  wx.removeStorageSync(`showAdvert${table[currentDay - 2]}`)
}

let n = 0
if (currentDay % item.ads.length === 0) {
  n = 1
} else if (currentDay % item.ads.length === 1) {
  n = 0
}

const advert = wx.getStorageSync(`showAdvert${table[currentDay - 1]}`) || false    
if (!advert) {
  this.setData!({showAdvert: true})
  wx.setStorageSync('showAdvert', true)
}

const timeStamp = Math.floor(new Date().getTime() / 10000).toString()
this.setData!({
  advertLink: item.ads[n].image + `?timeStamp=${timeStamp}`,
  copyWechat: item.ads[n].uri,
}, () => {
  wx.setStorageSync(`showAdvert${table[currentDay - 1]}`, true)
})

onShow(){
  const showAdvert = wx.getStorageSync('showAdvert')
  this.setData!({showAdvert})
}