好久没写jade了，发现以前的代码都跑不起来了。。。。

  p 'this is ok #{title}'
  p(style='#{title}') this is not ok

但这样写就是好的

p(style=`${title}`) this is ok

后来发现文档

Caution

Previous versions of Pug/Jade supported an interpolation syntax such as:

a(href="/#{url}") Link

This syntax is no longer supported. Alternatives are found below. (Check our migration guide for more information on other incompatibilities between Pug v2 and previous versions.)

这个break不开心，直接deprecated不好，需要看看v2文档

https://pugjs.org/api/migration-v2.html