自己用到了 找了下  先附上原作的链接  http://www.cnblogs.com/songdongdong/p/7251254.html

原谅我窃取你的果实  谢谢你谢谢你 ~

先附上我自己用到的

----------------------------------------------我是分界线--------------------------------------------------------

下面的是原作哦~~~~

function formatDate (val) {
// 格式化时间
let start = new Date(val)
let y = start.getFullYear()
let m = (start.getMonth() + 1) > 10 ? (start.getMonth() + 1) : '0' + (start.getMonth() + 1)
let d = start.getDate() > 10 ? start.getDate() : '0' + start.getDate()
return y + '-' + m + '-' + d
}

function mistiming (sDate1, sDate2) {
// 计算开始和结束的时间差
let aDate, oDate1, oDate2, iDays
aDate = sDate1.split('-')
oDate1 = new Date(aDate[1] + '-' + aDate[2] + '-' + aDate[0])
aDate = sDate2.split('-')
oDate2 = new Date(aDate[1] + '-' + aDate[2] + '-' + aDate[0])
iDays = parseInt(Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 / 24)
return iDays + 1
}

function countDate (start, end) {
// 判断开始和结束之间的时间差是否在90天内
let days = mistiming(start, end)
let stateT = days > 90 ? Boolean(0) : Boolean(1)
return {
state: stateT,
day: days
}
}46
function timeForMat (count) {
// 拼接时间
let time1 = new Date()
time1.setTime(time1.getTime() - (24 * 60 * 60 * 1000))
let Y1 = time1.getFullYear()
let M1 = ((time1.getMonth() + 1) > 10 ? (time1.getMonth() + 1) : '0' + (time1.getMonth() + 1))
let D1 = (time1.getDate() > 10 ? time1.getDate() : '0' + time1.getDate())
let timer1 = Y1 + '-' + M1 + '-' + D1 // 当前时间
let time2 = new Date()
time2.setTime(time2.getTime() - (24 * 60 * 60 * 1000 * count))
let Y2 = time2.getFullYear()
let M2 = ((time2.getMonth() + 1) > 10 ? (time2.getMonth() + 1) : '0' + (time2.getMonth() + 1))
let D2 = (time2.getDate() > 10 ? time2.getDate() : '0' + time2.getDate())
let timer2 = Y2 + '-' + M2 + '-' + D2 // 之前的7天或者30天
return {
t1: timer1,
t2: timer2
}
}

function yesterday (start, end) {
// 校验是不是选择的昨天
let timer = timeForMat(1)
return timer
}

function sevenDays () {
// 获取最近7天
let timer = timeForMat(7)
return timer
}

function thirtyDays () {
// 获取最近30天
let timer = timeForMat(30)
return timer
}

export {
formatDate,
countDate,89 yesterday,
sevenDays,
thirtyDays
}