<!DOCTYPE html>
<html>
<body>
<h3>演示如何访问 OL 元素</h3>
<ol id="myOl">
<li>Coffee</li>
<li>Tea</li>
<li>Milk</li>
</ol>
<p>点击按钮来设置列表项的数字从 25 开始递增。</p>
<button onclick="myFunction()">试一下</button>
<script>
function myFunction()
{
var x = document.getElementById("myOl");
x.start = "25";
}
</script>
</body>
</html>