NodeJS/Express应用程序的使用顺序和用法 [英] NodeJS/Express app.use sequence and usage

问题描述

我试图将节点路由分为两个部分:HTML/App和REST.这是我所做的:

I tried to separate my node routing into two parts: HTML/App and REST. Here is what I've done:

app.js:

var appPort = process.env.PORT || 80;
var express = require('express');
var http = require('http');
var appRouter = require('./routes/index');
var restRouter = require('./routes/rest');
var app = express();
var srv = http.createServer(app);

app.set('port', appPort);
app.set('view engine', 'jade');
app.use(express.static(path.join(__dirname, 'public')));

app.use('/api/rest/', restRouter); // this seems not working .. I never get the expected response
app.use('/', appRouter);           // I get this even with localhost/api/rest/...

var server = srv.listen(app.get('port'), function() {
    debug('Express server listening  ' + server.address().address + ':' + server.address().port);
});

index.js:

var express = require('express');
var router = express.Router();

router.get('/*', function (req, res) {
    res.send('HOME')
});

module.exports = router;

rest.js

var express = require('express');
var router = express.Router();

router.get('/api/rest/*', function(req, res) {
    res.send('REST API');
});

module.exports = router;

我的问题:
1.通常有可能以这种方式构建多个路由器吗?
2. get.use的顺序是否重要，和/或我是否必须处理"next"?
3.如果我想访问路由器内部的数据库，我可以交出这样的一个参数:

My questions:
1. It's possible in general to build multiple routers in this way?
2. Does the sequence of get.use matter, and/or do I have to deal with 'next'?
3. In case I would like to access a database inside the router can I hand over a parameter like this:

// ...
var client  = new pg.Client(dbConnection);
// ...
app.use('/', appRouter(client));

推荐答案

1)可以通过这种方式构建多个路由器.

因为您正在使用此

app.use('/api/rest/', restRouter);

您在 rest.js 中的路由调用将相对于/api/rest/，这意味着您的代码应在 rest.js 看起来像这样:

your route calls in rest.js will be relative to /api/rest/ which means your code should be modified in rest.js to look like this:

router.get('*', function(req, res) {
    res.send('REST API');
});

我也鼓励您查看快速多路由器示例在GitHub上.通过显示具有版本化路由的REST应用程序，可以非常清楚地说明这一点.

I would also encourage you to see the Express multi-router example on GitHub. It illustrates this point very clearly by showing a REST app with versioned routes.

2)事物的顺序很重要

请参见有关app.use的快速文档，您会注意到:

中间件功能是顺序执行的，因此顺序中间件的包含很重要.

Middleware functions are executed sequentially, therefore the order of middleware inclusion is important.

如果您颠倒了 app.use 调用的顺序，则 router.get('/*'，function(req，res){> index.js 会在您到达其他路线之前捕获所有内容……违背了您的目标.

If you reverse the order of your app.use calls, the router.get('/*', function (req, res) { line in index.js will catch everything before you get to other routes...defeating your purpose.

此外，如果您不拨打 next ，Express将无法知道您已完成操作，甚至无法继续下一个中间件或路由.

Also, if you don't call next, Express has no way to know that you are done or even that you want to continue to the next middleware or route.

3)数据库问题是模块/范围问题

这不是快速问题，更多的是范围问题.我建议您查找有关javascript范围以及 Node处理模块的方式的一些出色著作.

This is more of a scope question than an Express question. I'd suggest looking up some of the excellent writing about javascript scope and also on how Node handles modules.

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