快遞Router.use需要回調函數的錯誤

Question

我正在試圖中間件添加到我的應用程序以下錯誤：

throw new TypeError('Router.use() requires callback function'); 

MyMiddleware.js

module.exports = function(options) { 
    var err = checkOptions(options); 
    if(err) { 
    throw err; 
    } 

    var middleware = function(req, res, next) { 
     // do something here 
    } 

    return middleware; 
} 

這是怎麼了加我的中間件：

var MyMiddleware = require('./server/middlewares/MyMiddleware'); 
var middleware = MyMiddleware(config); 
router.use('/path', middleware); 
app.use('/', router); 

我使用express 4.x版。

Answer 1

您將模塊定義爲函數，您必須調用它。

var MyMiddleware = require('./server/middlewares/MyMiddleware')();