layouts文件夹，新建404.html
<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8" />
<meta name="description" content="公益404页面是由腾讯公司员工志愿者自主发起的互联网公益活动。" />
<link rel="icon" href="data:image/gif;base64,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">
<title>404 您访问的页面搞丢了</title>
</head>
<body>
<script>
let s = document.createElement("script");
s.src="//volunteer.cdn-go.cn/404/latest/404.js"
s.crossorigin="anonymous"
document.getElementsByTagName("head")[0].appendChild(s);
</script>
</body>
</html>
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