​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>Element 对象</h1>
​
<h2>id 属性</h2>
​
<a id="myAnchor1" href="https://www.w3school.com.cn/html/">HTML</a>
<a id="myAnchor2" href="https://www.w3school.com.cn/css/">CSS</a>
<a id="myAnchor3" href="https://www.w3school.com.cn/js/">JavaScript</a>
​
<p>第一个链接的 id 属性值是：</p>
<p id="demo"></p>
​
<script>
let id = document.getElementsByTagName("a")[0].id;
document.getElementById("demo").innerHTML = id;
</script>
​
</body>
</html>
​