​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>通过 id 查找 HTML 元素</h1>
​
<p id="intro">Hello World!</p>
​
<p>本例演示 <b>getElementsById</b> 方法。</p>
​
<p id="demo"></p>
​
<script>
var myElement = document.getElementById("intro");
document.getElementById("demo").innerHTML = 
"来自 intro 段落的文本是：" + myElement.innerHTML;
</script>
​
</body>
</html>
​