JS 時間戳轉換成幾天前

 transDate: function (mescStr) {
  var n = mescStr;
  var date = new Date(n);
  // var Y = date.getFullYear() + '-';
  var M = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1) + '-';
  var D = date.getDate() < 10 ? '0' + date.getDate() + ' ' : date.getDate() + ' ';
  var H = date.getHours() + ':';
  var Mi = date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes();
 

  var M2 = date.getMonth() +1;
  var D2 = date.getDate();
  var H2 = date.getHours();
  var Mi2 = date.getMinutes();

  var date1 = new Date();
  var M1 = date1.getMonth()+1;
  var D1 = date1.getDate();
  var H1 = date1.getHours();
  var Mi1 = date1.getMinutes();
  console.log(M1 + " " + D1 + "....")
  if(M1 > M2 || D1 > D2){
    return (M + D + H + Mi)
  }
   else if (H1-H2>1){
     var H3= H1-H2
    return (H3+"小時前")
  }
  else if (Mi1 - Mi2 > 1) {
    var Mi3 = Mi1 - Mi2
    return (Mi3 + "分鐘前")
  }
 else{
    return "剛剛"
 }
},