<!DOCTYPE html>
<html>
<body>
<h1>Document 对象</h1>
<h2>lastModified 属性</h2>
<p>本文档最后修改时间：</p>
<p id="demo"></p>
<script>
let text = document.lastModified;
document.getElementById("demo").innerHTML = text;
</script>
</body>
</html>