//获取n天前或n天后的日期
getTime(n) {
var currentDate = new Date()
var preDate = new Date(currentDate.getTime() + n*24*3600*1000)
let year = currentDate.getFullYear()
let mon = currentDate.getMonth() + 1
let day = currentDate.getDay()
let s = year + '-' + (mon<10?('0'+mon):mon) + '-' + (day<10?('0'+day):day)
return s
}
getTime(0) //今天的日期2022-06-18
getTime(-1)//2022-06-17
getTime(1) // 2022-06-19