element.nextElementSibling与element.previousElementSibling案例
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div>
<ul>
<li>123</li>
<li>123</li>
<li>123</li>
<li id="four">第四个li</li>
<li>123</li>
<li>123</li>
<li>123</li>
<li>123</li>
<li>123</li>
<li>123</li>
</ul>
</div>
<script>
let li_4 = document.getElementById(‘four‘);
li_4.previousElementSibling.style.backgroundColor = ‘pink‘;
li_4.nextElementSibling.style.backgroundColor = ‘red‘;
</script>
</body>
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