在express.static之前具有中间件功能不起作用 [英] Having a middleware function before express.static doesnt work

问题描述

我正在运行最新的Express(截至撰写时为4.1.1).它具有此中间件，用于提供静态文件.

I am running the latest express (4.1.1 as of writing). It has this middleware included to serve static files.

因此，包含此中间件的常用代码是:

So the usual code to include this middleware is:

app.use(express.static(path.join(__dirname, 'public')));

很好，一切正常.但是，如果我尝试在此之前加入中间件，例如:

And great that all works fine. But if I try to include a middleware before that, eg:

app.use(function(req,res,next){                    
    next();                                          
}, express.static(path.join(__dirname, 'public')));

静态服务中间件现在为我提供404.

The serve-static middleware now gives me 404s.

我不确定为什么会这样.我是否错误地实现了在静态中间件之前的中间件?

I am not sure why this is happening. Did I implement the middleware that goes before the static middleware incorrectly?

推荐答案

您对 app.use() 不正确.从文档:

app.use([path]，function)
使用给定的中间件函数，以及可选的挂载 path ，默认为"/".

app.use([path], function)
Use the given middleware function, with optional mount path, defaulting to "/".

您会注意到， app.use 接受可选路径和一个函数，而不是多个函数.因此，您应该使用自己的 app.use 调用定义每个中间件，如下所示:

You will notice that app.use accepts an optional path and a function, not multiple functions. Therefore, you should be defining each middleware with its own app.use call, as seen below:

app.use(function(req,res,next){                    
    next();                                          
});
app.use(express.static(path.join(__dirname, 'public')));

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