在Express中像Koa那样使用Generator方法。
安装：
npm install express-coroutine --save初始化：
// Init expressconst express = require('express-coroutine')(require('express'));const app = express();// Init routerconst express = require('express-coroutine')(require('express'));const app = express();const router = new expressGenerators.Router();app.use(router);router.get('/', function* (req, res) { res.send('it works!');});使用：
const express = require('express-coroutine')(require('express'));const app = express();app.get('/user/:id', function* (req, res) { const user = yield User.findById(req.params.id); res.send(user);})app.get('/error', function* (req, res) { throw new Error('Bang!');});app.listen(8000);更多用法详见测试文件：https://github.com/yourtion/express-coroutine/blob/master/test.js
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