在开发中，需要处理一些时间之间的差值，后端传给我们开始时间与结束时间，我们则需要用当前时间来判断两组时间之间的差值，在js中可以这样写，上代码：
let now = new Date()
let year = now.getFullYear()
let month = now.getMonth()
let date = now.getDate()
let hour = now.getHours()
let minu = now.getMinutes();
let sec = now.getSeconds()
month = month + 1
if (month < 10){ month = "0" + month;}
if (date < 10) date = "0" + date;
if (hour < 10) hour = "0" + hour;
if (minu < 10) minu = "0" + minu;
if (sec < 10) sec = "0" + sec;
let time = year + '-' + month + '-' + date + ' ' + hour + ':' + minu + ':' + sec
Date.prototype.diff = function(date){
return (this.getTime() - date.getTime())/(24 * 60 * 60 * 1000)
}
let nowTime = new Date(now)
let end = new Date('2021/03/26 12:43:45')
let endTime = end.diff(nowTime)
如果想要向下取整可以这样写：
let floorTime = Math.floor(endTime)
如果想要向上取整可以这样写：
let ceilTime = Math.ceil(endTime)
