来源：https://www.w3school.com.cn/js/js_htmldom_css.asp
1，
document.getElementById(id).style.property = new style
<html>
<body>
<p >Hello World!</p>
<script>
document.getElementById("p2").style.color = "blue";
</script>
<p>上面的段落已被脚本改变。</p>
</body>
</html>