如何使用Combobox SelectedValue使TextBox可见？

<select id="myComboBox">
  <option value="1">选项1</option>
  <option value="2">选项2</option>
  <option value="3">选项3</option>
</select>

<input type="text" id="myTextBox" style="display:none;">

var comboBox = document.getElementById("myComboBox");
var textBox = document.getElementById("myTextBox");

comboBox.addEventListener("change", function() {
  var selectedValue = comboBox.value;
  
  if (selectedValue === "2") {
    textBox.style.display = "block";
  } else {
    textBox.style.display = "none";
  }
});