我想在动态创建textbox时，在javascript中将一个TextBox值分配给另一个textbox

<input type="text" id="textbox1">
<input type="text" id="textbox2">

var textbox1 = document.getElementById("textbox1");
var textbox2 = document.getElementById("textbox2");

textbox2.value = textbox1.value;

<input type="text" id="textbox1">
<input type="text" id="textbox2">

<script>
  var textbox1 = document.getElementById("textbox1");
  var textbox2 = document.getElementById("textbox2");

  textbox2.value = textbox1.value;
</script>

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

<script>
  var container = document.getElementById("container");

  var textbox1 = document.createElement("input");
  textbox1.type = "text";
  textbox1.id = "textbox1";

  var textbox2 = document.createElement("input");
  textbox2.type = "text";
  textbox2.id = "textbox2";

  container.appendChild(textbox1);
  container.appendChild(textbox2);

  // 在这里继续编写代码，将textbox1的值分配给textbox2
</script>