翡翠：服务路线资源

Question

在我的./inc/footer.jade我有一堆脚本标签。我想在一个特定的路线中提供额外的脚本。如何完成此操作？ 在控制器中我可以做到：

res.render('someTemplate', {
  extraScript: true
});

.

和footer.jade

- if (extraScript)
  <script src="/script.js"></script>

.

但是，我必须在每条路线中包含这个'extrascript'变量（设置为false）。

Answer 1

You can use typeof to check whether a variable exists.

- if (typeof extraScript !== 'undefined')
  <script src="/script.js"></script>

In this way, for all the routes that do not need the additional script, you simply don't pass in extraScript, and then in the template, typeof extraScript !== undefined will be evaluated to false.

Answer 2

The extraScript solution works, but I believe a better solution would be to use template inheritance (block and extends keywords) . This way you don't have to add logic and a local variable to your templates, and you can still keep things DRY in your jade markup.