在javascript中从下拉列表创建文本框

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

<div id="textbox-container"></div>

var dropdown = document.getElementById("dropdown");
var textboxContainer = document.getElementById("textbox-container");

dropdown.addEventListener("change", function() {
  createTextbox();
});

function createTextbox() {
  var selectedValue = dropdown.value;
  var textbox = document.createElement("input");
  textbox.type = "text";
  textboxContainer.appendChild(textbox);
}