关于时间类型是数字类型转换方法

function formatDate(numb, format) {
if (isNaN(numb)) {
return numb
} else {
const time = new Date((numb - 1) * 24 * 3600000 + 1)
time.setYear(time.getFullYear() - 70)
constyear = time.getFullYear() + ‘’
constmonth = time.getMonth() + 1 + ‘’
const date = time.getDate() + ‘’
if (format && format.length === 1) {
return year + format + month + format + date
}
return year + (month < 10 ? ‘0’ + month : month) + (date < 10 ? ‘0’ + date : date)
}
}
封装方法导出：export default formatDateNum