var t1="2017/08/28 04:56:38"; //數(shù)據(jù)
var dateBegin = new Date(t1);//轉(zhuǎn)化為Date對(duì)象的形式
//Mon Aug 28 2017 04:56:38 GMT+0800 (中國標(biāo)準(zhǔn)時(shí)間) 這里就是Date對(duì)象的數(shù)據(jù)形式

let t1="2017-05-12 00:13:53";
let dateBegin = new Date(d1.replace(/-/g, "/"));//replace方法將-轉(zhuǎn)為/

let dateEnd = new Date();//當(dāng)前時(shí)間數(shù)據(jù)

function timeFn(d1) {//di作為一個(gè)變量傳進(jìn)來
//如果時(shí)間格式是正確的，那下面這一步轉(zhuǎn)化時(shí)間格式就可以不用了
let dateBegin = new Date(d1.replace(/-/g, "/"));//將-轉(zhuǎn)化為/，使用new Date
let dateEnd = new Date();//獲取當(dāng)前時(shí)間
let dateDiff = dateEnd.getTime() - dateBegin.getTime();//時(shí)間差的毫秒數(shù)
let dayDiff = Math.floor(dateDiff / (24 * 3600 * 1000));//計(jì)算出相差天數(shù)
let leave1=dateDiff%(24*3600*1000) //計(jì)算天數(shù)后剩余的毫秒數(shù)
let hours=Math.floor(leave1/(3600*1000))//計(jì)算出小時(shí)數(shù)
//計(jì)算相差分鐘數(shù)
let leave2=leave1%(3600*1000) //計(jì)算小時(shí)數(shù)后剩余的毫秒數(shù)
let minutes=Math.floor(leave2/(60*1000))//計(jì)算相差分鐘數(shù)
//計(jì)算相差秒數(shù)
let leave3=leave2%(60*1000) //計(jì)算分鐘數(shù)后剩余的毫秒數(shù)
let seconds=Math.round(leave3/1000)
console.log(" 相差 "+dayDiff+"天 "+hours+"小時(shí) "+minutes+" 分鐘"+seconds+" 秒")
console.log(dateDiff+"時(shí)間差的毫秒數(shù)",dayDiff+"計(jì)算出相差天數(shù)",leave1+"計(jì)算天數(shù)后剩余的毫秒數(shù)"
,hours+"計(jì)算出小時(shí)數(shù)",minutes+"計(jì)算相差分鐘數(shù)",seconds+"計(jì)算相差秒數(shù)");
}
let t3="2017-08-18 04:56:38";
timeFn(t3);

//這里的dayDiff就是上文計(jì)算出的天數(shù)差
let monthDiff=Math.floor(dayDiff/30);//以30天為一個(gè)月不夠精準(zhǔn)嚴(yán)謹(jǐn)
//獲取相差的月份
if (monthDiff<12){
timeThis=monthDiff+"個(gè)月前發(fā)布";//獲取相差的月份
return
}
let yearDiff=Math.floor(monthDiff/12);//獲取相差的年份
if(yearDiff>=1){
timeThis=yearDiff+"年前發(fā)布";
return
}

獲取當(dāng)前月份的天數(shù)
function getDays() {
//構(gòu)造當(dāng)前日期對(duì)象
var date = new Date();
var year = date.getFullYear();//獲取年份
var mouth = date.getMonth() + 1;//獲取當(dāng)前月份
var days;//定義當(dāng)月的天數(shù)；
if (mouth == 2) {//當(dāng)月份為二月時(shí)，根據(jù)閏年還是非閏年判斷天數(shù)
days = year % 4 == 0 ? 29 : 28;
}
else if (mouth == 1 || mouth == 3 || mouth == 5 || mouth == 7 || mouth == 8 || mouth == 10 || mouth == 12) {
//月份為：1,3,5,7,8,10,12 時(shí)，為大月.則天數(shù)為31；
days = 31;
}
else {
//其他月份，天數(shù)為：30.
days = 30;
}
return days;
}