<!DOCTYPE html>
<html>
<head>
<style>
body {background-color:yellow; color:red;}
</style>
</head>
<body>
<p>点击按钮显示文档的 style 属性。</p>
<p id="demo"></p>
<button onclick="myFunction()">尝试一下</button>
<script>
function myFunction()
{
var x = document.getElementsByTagName("STYLE")[0];
document.getElementById("demo").innerHTML = x.innerHTML;
};
</script>
</body>
</html>
