可以帮我看下吗，刚学，实在想不明白，为什么在创建option之前获取到它，body加了一个div就没有获取到select里面的option
`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title></head>
<body>
</body>
<script>
const body = document.body;
body.appendChild(document.createElement('select'));
console.log(body.children[1]);
body.children[1].appendChild(document.createElement('option')).innerHTML=77;</script>
</html>
