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<!DOCTYPE html> <html> <body> <p id="myP">单击按钮获取此 <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>