js时间转化为几天前,几小时前，几分钟前

function getDateDiff(dateTimeStamp){
      var minute = 1000 * 60;
      var hour = minute * 60;
      var day = hour * 24;
      var halfamonth = day * 15;
      var month = day * 30;
      var now = new Date().getTime();
      var diffValue = now - dateTimeStamp;
      if(diffValue < 0){return;}
      var monthC =diffValue/month;
      var weekC =diffValue/(7*day);
      var dayC =diffValue/day;
      var hourC =diffValue/hour;
      var minC =diffValue/minute;
      if(monthC>=1){
        result="" + parseInt(monthC) + "月前";
      }
      else if(weekC>=1){
        result="" + parseInt(weekC) + "周前";
      }
      else if(dayC>=1){
        result=""+ parseInt(dayC) +"天前";
      }
      else if(hourC>=1){
        result=""+ parseInt(hourC) +"小时前";
      }
      else if(minC>=1){
        result=""+ parseInt(minC) +"分钟前";
      }else
      result="刚刚";
      return result;
    }

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