如何始终连续显示3张卡片

<div id="cardContainer">
  <div id="card1" class="card">Card 1</div>
  <div id="card2" class="card">Card 2</div>
  <div id="card3" class="card">Card 3</div>
</div>

#cardContainer {
  display: flex;
  justify-content: space-between;
}

.card {
  width: 200px;
  height: 150px;
  border: 1px solid #000;
  background-color: #f0f0f0;
}

var cardContainer = document.getElementById("cardContainer");
var currentIndex = 0;

setInterval(function() {
  var cards = cardContainer.getElementsByClassName("card");
  for (var i = 0; i < cards.length; i++) {
    cards[i].style.display = "none";
  }
  
  cards[currentIndex].style.display = "block";
  
  if (currentIndex < 2) {
    currentIndex++;
  } else {
    currentIndex = 0;
  }
}, 2000);