let u = navigator.userAgent;  //判斷瀏覽器型號
   let isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1;  //android終端
   let isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios終端
   if(isiOS){
    let time = new Date((v[0].createTime).replace(/-/g,'/')).getTime();
     this.timeago=this.getDateDiff(time);
   }else{
    let time = new Date(v[0].createTime).getTime();
     this.timeago=this.getDateDiff(time);
   }

判斷時間過去了多久
  getDateDiff(dateTimeStamp){
  let result;
  let minute = 1000 * 60;
  let hour = minute * 60;
  let day = hour * 24;
  let halfamonth = day * 15;
  let month = day * 30;
  let now = new Date().getTime();
  let diffValue = now - dateTimeStamp;
  if(diffValue < 0){
   return;
  }
  let monthC =diffValue/month;
  let weekC =diffValue/(7*day);
  let dayC =diffValue/day;
  let hourC =diffValue/hour;
  let minC =diffValue/minute;
  if(monthC>=1){
   if(monthC<=12)
    result="" + parseInt(monthC) + "月前";
   else{
    result="" + parseInt(monthC/12) + "年前";
   }
  }
  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) +"小時前";
  }
  else if(minC>=1){
   result=""+ parseInt(minC) +"分鐘前";
  }else{
   result="剛剛";
  }
  return result;
 },