我需要放置一个文本视图，指示类似于cart count的按钮

<div id="cart">
  <button id="cartButton" onclick="addToCart()">Add to Cart</button>
  <span id="cartCount">0</span>
</div>

#cart {
  display: flex;
  align-items: center;
}

#cartButton {
  margin-right: 10px;
}

#cartCount {
  background-color: #ff0000;
  color: #ffffff;
  padding: 5px;
  border-radius: 50%;
}

var cartCount = 0;

function addToCart() {
  cartCount++;
  document.getElementById("cartCount").textContent = cartCount;
}