js时间对比-转化为几天前,几小时前，几分钟前

 1 function getDateDiff(dateTimeStamp){
 2     var minute = 1000 * 60;
 3     var hour = minute * 60;
 4     var day = hour * 24;
 5     var halfamonth = day * 15;
 6     var month = day * 30;
 7     var now = new Date().getTime();
 8     var diffValue = now - dateTimeStamp;
 9     if(diffValue < 0){return;}
10     var monthC = diffValue/month;
11     var weekC = diffValue/(7*day);
12     var dayC = diffValue/day;
13     var hourC = diffValue/hour;
14     var minC = diffValue/minute;
15     if(monthC >= 1){
16         result = parseInt(monthC) + "月前";
17     }else if(weekC >= 1){
18         result = parseInt(weekC) + "周前";
19     }else if(dayC >= 1){
20         result = parseInt(dayC) +"天前";
21     }else if(hourC >= 1){
22         result = parseInt(hourC) +"小时前";
23     }else if(minC >= 1){
24         result = parseInt(minC) +"分钟前";
25     }else{
26         result = "刚刚";
27     }
28     return result;
29 }

转换标准时间为时间戳：

1 function getDateTimeStamp(dateStr){
2     return Date.parse(dateStr.replace(/-/gi,"/"));
3 }

调用：

1 var timeStr = '2018-05-16 15:02:20',
2       timeStamp = getDateTimeStamp(timeStr);
3 console.log(getDateDiff(timeStamp));