<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title></title>
 </head>
 <body>
 <script> 
 var pretime = "2018-04-07 14:38:16";
 
 var minute = 1000 * 60;
 var hour = minute * 60;
 var day = hour * 24;
 var halfamonth = day * 15;
 var month = day * 30;
 
 //这是第一次打开页面时调用
 getDate(pretime);
 
 //然后再每隔一分钟更新一次时间
 setInterval(function() {
 getDate(pretime);
 }, 60000);
 
 function getDate(dateTimeStamp){
 
 if(dateTimeStamp==undefined){
 
 return false;
 }else{
 dateTimeStamp = dateTimeStamp.replace(/-/g, "/");
 
 var sTime = new Date(dateTimeStamp).getTime();//把时间pretime的值转为时间戳
 
 var now = new Date().getTime();//获取当前时间的时间戳
 
 var diffValue = now - sTime;
 
 if(diffValue < 0){
 console.log("结束日期不能小于开始日期!");
 }
 
 var monthC =diffValue/month;
 var weekC =diffValue/(7*day);
 var dayC =diffValue/day;
 var hourC =diffValue/hour;
 var minC =diffValue/minute;
 
 if(monthC>=1){
 console.log(parseInt(monthC) + "个月前");
 }
 else if(weekC>=1){
 console.log(parseInt(weekC) + "周前")
 }
 else if(dayC>=1){
 console.log(parseInt(dayC) +"天前")
 }
 else if(hourC>=1){
 console.log(parseInt(hourC) +"个小时前")
 }
 else if(minC>=1){
 console.log(parseInt(minC) +"分钟前")
 }else{
 console.log("刚刚")
 }
 }
 
 }
</script>
 </body>
</html>
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