js计算时间为刚刚、几分钟前、几小时前、几天前··

//dateTimeStamp是一个时间毫秒，注意时间戳是秒的形式，在这个毫秒的基础上除以1000，就是十位数的时间戳。13位数的都是时间毫秒。

function timeago(dateTimeStamp){  
     var minute = 1000 * 60;      //把分，时，天，周，半个月，一个月用毫秒表示
     var hour = minute * 60;
     var day = hour * 24;
     var week = day * 7;
     var halfamonth = day * 15;
     var month = day * 30;
     var now = new Date().getTime();   //获取当前时间毫秒
     console.log(now)
     var diffValue = now - dateTimeStamp;//时间差
 
     if(diffValue < 0){
         return;
     }
     var minC = diffValue/minute;  //计算时间差的分，时，天，周，月
     var hourC = diffValue/hour;
     var dayC = diffValue/day;
     var weekC = diffValue/week;
     var monthC = diffValue/month;
     if(monthC >= 1 && monthC <= 3){
         result = " " + parseInt(monthC) + "月前"
     }else if(weekC >= 1 && weekC <= 3){
         result = " " + parseInt(weekC) + "周前"
     }else if(dayC >= 1 && dayC <= 6){
         result = " " + parseInt(dayC) + "天前"
     }else if(hourC >= 1 && hourC <= 23){
         result = " " + parseInt(hourC) + "小时前"
     }else if(minC >= 1 && minC <= 59){
         result =" " + parseInt(minC) + "分钟前"
     }else if(diffValue >= 0 && diffValue <= minute){
         result = "刚刚"
     }else {
         var datetime = new Date();
         datetime.setTime(dateTimeStamp);
         var Nyear = datetime.getFullYear();
         var Nmonth = datetime.getMonth() + 1 < 10 ? "0" + (datetime.getMonth() + 1) : datetime.getMonth() + 1;
         var Ndate = datetime.getDate() < 10 ? "0" + datetime.getDate() : datetime.getDate();
         var Nhour = datetime.getHours() < 10 ? "0" + datetime.getHours() : datetime.getHours();
         var Nminute = datetime.getMinutes() < 10 ? "0" + datetime.getMinutes() : datetime.getMinutes();
         var Nsecond = datetime.getSeconds() < 10 ? "0" + datetime.getSeconds() : datetime.getSeconds();
         result = Nyear + "-" + Nmonth + "-" + Ndate
     }
     return result;
 }

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