代码示例:(标识:jsck_node_ownerdocument)
<!DOCTYPE html>
<html>
<body>

<p id="myP">单击按钮可获取此 <p> 元素的所有者文档的节点类型。</p>

<button onclick="myFunction()">试一试</button>

<p id="demo"></p>

<script>
function myFunction() {
  var x= document.getElementById("myP").ownerDocument.nodeType;  
  document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>
运行结果: