app.set，然后出现TypeError:app.get不是一个函数 [英] app.set and then TypeError: app.get is not a function

问题描述

使用express 4.x时，我将在server.js中设置端口，如下所示.

While using express 4.x, I am setting the port in my server.js like in the following.

var express = require('express');
var app = express();
...
var port = process.env.PORT || 8080;
app.set('port', port);
...
module.exports = app;

但是当我尝试在我的路由文件中访问它时，如下所示...

But when I try to access it within my routes file, like the following...

// path to routes file is app/models, hence the '../../'
var app = require('../../server');

// default route
router.get('/', function (req, res) {
    res.send('Hello! The API is at http://localhost:' + app.get('port') + '/api');
});

...出现以下错误.

... I get the following error.

TypeError: app.get is not a function

到底是怎么回事?

推荐答案

好的，我终于明白了.未在路由文件中正确设置 app ，因为我们之前在 require('./app/models/routes'之后执行过 module.exports = app ); 在server.js中.因此，一旦我将应用程序的导出移到了需要routes文件之前，一切就正常了！

Okay, I have finally figured it out. The app was not properly being set within the routes file because we were previously doing module.exports = app after require('./app/models/routes'); within server.js. So as soon as I moved the exporting of the app to happen before the requiring of the routes file... everything worked!

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