​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>Element 对象</h1>
​
<h2>namespaceURI 属性</h2>
​
<p id="myP">本段的命名空间 URI 是：</p>
​
<p id="demo"></p>
​
<script>
let uri = document.getElementById("demo").namespaceURI;  
document.getElementById("demo").innerHTML = uri;
</script>
​
</body>
</html>
​