Includes
jade允许利用include将其他文件（支持filters所支持的类型）中的代码嵌入当前代码中。
jade：
//- index.jade
doctype html
html
include ./includes/head.jade
body
h1 My Site
p Welcome to my super lame site.
include ./includes/foot.jade
//- includes/head.jade
head
title My Site
script(src='/javascripts/jquery.js')
script(src='/javascripts/app.js')
//- includes/foot.jade
#footer
p Copyright (c) foobar
html：
index.html
<!doctype html>
<html>
<head>
<title>My Site</title>
<script src='/javascripts/jquery.js'></script>
<script src='/javascripts/app.js'></script>
</head>
<body>
<h1>My Site</h1>
<p>Welcome to my super lame site.</p>
<div id="footer">
<p>Copyright (c) foobar</p>
</div>
</body>
</html>