document.createElement()是在對象中創建一個對象，要與appendChild() 或 insertBefore()方法聯合使用。其中，appendChild() 方法在節點的子節點列表末添加新的子節點。insertBefore() 方法在節點的子節點列表任意位置插入新的節點。

下面，舉例說明document.createElement()的用法。<div></div>
例1：

復制代碼 代碼如下:

<script type="text/javascript">
var board = document.getElementById("board");
var e = document.createElement("input");
e.type = "button";
e.value = "這是測試加載的小例子";
var object = board.appendChild(e);
</script>

復制代碼 代碼如下:

<script type="text/javascript">
var board = document.getElementById("board");
var e2 = document.createElement("select");
e2.options[0] = new Option("加載項1", "");
e2.options[1] = new Option("加載項2", "");
e2.size = "2";
var object = board.appendChild(e2);
</script>

復制代碼 代碼如下:

<script type="text/javascript">
var board = document.getElementById("board");
var e3 = document.createElement("input");
e4.setAttribute("type", "text");
e4.setAttribute("name", "q");
e4.setAttribute("value", "使用setAttribute");
e4.setAttribute("onclick", "javascript:alert('This is a test!');");
var object = board.appendChild(e3);
</script>

復制代碼 代碼如下:

<script type="text/javascript">
var oTest = document.getElementById("test");
var newNode = document.createElement("p");
newNode.innerHTML = "This is a test";
//測試從這里開始
//appendChild方法：
oTest.appendChild(newNode);
//insertBefore方法：
oTest.insertBefore(newNode,null);
</script>

復制代碼 代碼如下:

<script type="text/javascript">
var oTest = document.getElementById("test");
var refChild = document.getElementById("x1");
var newNode = document.createElement("p");
newNode.innerHTML = "This is a test";
oTest.insertBefore(newNode,refChild);
</script>

復制代碼 代碼如下:

<script type="text/javascript">
var oTest = document.getElementById("test");
var refChild = document.getElementById("x1");
var newNode = document.createElement("p");
newNode.innerHTML = "This is a test";
oTest.insertBefore(newNode,refChild.nextSibling);
</script>

復制代碼 代碼如下:

<script type="text/javascript">
var oTest = document.getElementById("test");
var newNode = document.createElement("p");
newNode.innerHTML = "This is a test";
oTest.insertBefore(newNode,oTest.childNodes[0]);
</script>