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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>DOM对象的继承关系</title>
</head>
<body>
<div id="test"></div>
<script>
var test=document.getElementById('test');
document.write(test+'<br>');
document.write(test.__proto__+'<br>');
document.write(test.nodeName+'<br>');
document.write(test.tagName+'<br>');
document.write(document.nodeName+'<br>');
document.write(document.tagName);
</script>
</body>
</html>