js 判斷一個時間戳距離當前時間多久

傳入一個時間戳，判斷距離當前多久，返回幾分鐘、幾小時、幾天、幾個月；

當大於1年，直接輸出時間格式

/**
* 參數 diffValue  時間戳
* 
*/

function getDate(diffValue){	
  var minute = 60;
  var hour = minute * 60;
  var day = hour * 24;
  var month = day * 30;
					
  var monthC =diffValue/month;
  var weekC =diffValue/(7*day);
  var dayC =diffValue/day;
  var hourC =diffValue/hour;
  var minC =diffValue/minute;
  var res = '';
  var nowTime = (new Date()).getTime(); // 獲取當前時間戳
  if(monthC>=12){
    oldTime = nowTime - diffValue      // 獲取記錄的時間戳
    var date = new Date(oldTime);
    res = date.getFullYear()+'-'+(date.getMonth()+1)+'-'+date.getDate();

  }else if(monthC>=1){
    res = parseInt(monthC) + "個月前";
  }
  else if(weekC>=1){
    res = parseInt(weekC) + "周前"
  }
  else if(dayC>=1){
    res = parseInt(dayC) +"天前"
  }
  else if(hourC>=1){
    res = parseInt(hourC) +"個小時前"
  }
  else if(minC>=1){
    res = parseInt(minC) +"分鐘前"
  }else{
    res = "剛剛"
  }
  return res;  

}

console.log(getDate(100000000))