<!DOCTYPE html>
<html>
<body>
<p id="intro">Hello World!</p>
<p>本例演示 <b>getElementById</b> 方法！</p>
<script>
x=document.getElementById("intro");
document.write("<p>来自 intro 段落的文本：" + x.innerHTML + "</p>");
</script>
</body>
</html>