根节点ownerDocument

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>根节点ownerDocument</title>
    <!-- 
        所有document子节点都可以使用ele.ownerDocument;方法获取document节点
     -->
</head>
<body>
    <div>
        <main>
            <nav>
            </nav>
        </main>
    </div>
    <script>
        var nav=document.getElementsByTagName("nav")[0];//获取nav
        console.log(nav.ownerDocument);//#document
    </script>
</body>
</html>

来源：https://www.cnblogs.com/vinson-blog/p/12112731.html

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