let nowDate=Date.parse(new Date())
if(wx.getStorageSync('nowDate')){
let oldDate=wx.getStorageSync('nowDate')
if((nowDate-oldDate)>=43200000){
this.setData({
tips:true
})
wx.setStorageSync('nowDate', nowDate)
}
}else{
wx.setStorageSync('nowDate', nowDate)
}