res.locals

使用此属性设置在使用 res.render 呈现的模板中可访问的变量。res.locals 上设置的变量在单个请求-响应周期内可用，并且不会在请求之间共享。

Use this property to set variables accessible in templates rendered with res.render. The variables set on res.locals are available within a single request-response cycle, and will not be shared between requests.

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app.use((req, res, next) => {
  // Make `user` and `authenticated` available in templates
  res.locals.user = req.user
  res.locals.authenticated = !req.user.anonymous
  next()
})