​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>Document 对象</h1>
​
<h2>doctype 属性</h2>
​
<p>document.doctype.name 是：</p>
​
<p id="demo"></p>
​
<script>
const doctypeObj = document.doctype;
document.getElementById("demo").innerHTML = doctypeObj.name;
</script>
​
</body>
</html>
​