Express.js"app.use()需要中间件功能" [英] Express.js "app.use() requires middleware function"

问题描述

我正在学习Express.js 4和Node，但遇到一个我无法弄清的错误.

I'm learning Express.js 4 and Node, and I'm getting an error that I haven't been able to figure out.

我正在尝试使用node-sass包来编译我的sass代码，但是我无法启动它并运行它.

I'm trying to use the node-sass package to compile my sass code, but I haven't been able to get it up and running.

这是我主文件的精简版本:

Here is a stripped down version of my main file:

var express = require('express');
var sass = require('node-sass');

var app = express();

app.use(sass.middleware({
    src: __dirname + "/assets",
    dest: __dirname + "/static",
    debug: true
}));

app.use(express.static(__dirname + '/static'));

app.get('/', function(req, res){    
    res.send("Hello World");    
});

var server = app.listen(3000, function() {
    console.log("Node is now listening.");
});

当我使用node server.js运行此代码时，我又回想起一个错误:

When I run this with node server.js, I get an error thrown back at me:

TypeError: app.use() requires middleware functions

据此，我假设sass.middleware不是中间件功能...

From this, I'm assuming that sass.middleware is not a middleware function...

1. 此错误是什么意思?

1. What does this error mean?

为什么要扔它?

我该如何解决?

---

我能找到的最接近的答案来自此问题，但根据我从此处收集的信息来看，这些答案仅适用使用Express 3.

---

The closest answer I've been able to find was from this question, but from what I gleaned from here is that these answers will only work with Express 3.

如果有人能为我指出如何将Express 4和Sass一起设置的正确方向(如果确实可行)，我将不胜感激.

I would much appreciate if someone could point me in the right direction for how to setup Express 4 and Sass together (if indeed this is possible).

推荐答案

node-sass自述文件提到 node-sass-middleware .因此，如果您npm install node-sass-middleware然后执行:

The node-sass readme mentions that the middleware has been moved to node-sass-middleware. So if you npm install node-sass-middleware and then do:

var sassMiddleware = require('node-sass-middleware');
app.use(sassMiddleware({
  src: __dirname + "/assets",
  dest: __dirname + "/static",
  debug: true
}));

应该可以.

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