dateRange (t, t1) {
let range = ''
let sj = new Date(t)
let sj1 = new Date(t1)
let y = sj.getFullYear()
let m = sj.getMonth() + 1
let d = sj.getDate()
let y1 = sj1.getFullYear()
let m1 = sj1.getMonth() + 1
let d1 = sj1.getDate()
let month = Math.abs((y1 - y) * 12 + (m1 - m))
// 扩展,计算两个日期相差多少年多少月多少天
let y2 = Math.floor(month / 12)
// 天数:如果d1<d,d1=30+d1,然后mont-1.如果d1>d,就直接d1-d
let mont = month % 12
let day2 = Math.abs(d1 - d)
if (d1 < d) {
d1 = d1 + 30
day2 = Math.abs(d1 - d)
mont = mont - 1
}
if (y2 > 0) range += y2 + '年'
if (mont > 0) range += mont + '月'
if (day2 > 0) range += day2 + '天'
return range
}