js 转化为几天前,几小时前，几分钟前...

转换标准时间为时间戳：

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

计算时间差：

 function getDateDiff(dateTimeStamp) {
             var minute =  * ;
             var hour = minute * ;
             var day = hour * ;
             var halfamonth = day * ;
             var month = day * ;
             var year = day * ;
             var now = new Date().getTime();
             var diffValue = now - dateTimeStamp;
             if (diffValue < ) { return; }
             var yearC = diffValue / year;
             var monthC = diffValue / month;
             var weekC = diffValue / ( * day);
             var dayC = diffValue / day;
             var hourC = diffValue / hour;
             var minC = diffValue / minute;
             if (yearC >= ) {
                 result = "" + parseInt(yearC) + "年前";
             }
             if (monthC >= ) {
                 result = "" + parseInt(monthC) + "月前";
             }
             else if (weekC >= ) {
                 result = "" + parseInt(weekC) + "周前";
             }
             else if (dayC >= ) {
                 result = "" + parseInt(dayC) + "天前";
             }
             else if (hourC >= ) {
                 result = "" + parseInt(hourC) + "小时前";
             }
             else if (minC >= ) {
                 result = "" + parseInt(minC) + "分钟前";
             } else
                 result = "刚刚";
             return result;
         }

转：http://caibaojian.com/timestamp.html

js判断某一时间范围：

参考：　　https://zhidao.baidu.com/question/472622390.html

参考：　　https://jingyan.baidu.com/article/9f7e7ec0b98cb46f281554fd.html