用generator-angular-fullstack生成代码后，server目录下的app.js文件中有这么一段代码~ // Setup server var app = express(); var server = require(‘http’).createServer(app); require(’./config/express’)(app); require(’./routes’)(app);

// Start server server.listen(config.port, config.ip, function () { console.log(‘Express server listening on %d, in %s mode’, config.port, app. get(‘env’)); });

// Expose app exports = module.exports = app;

上面代码中不是特别理解为什么要重新createServer，然后server.listen，而不是直接app.listen，即下面这样 var app = express(); require(’./config/express’)(app); require(’./routes’)(app);

// Start server app.listen(config.port, config.ip, function () { console.log(‘Express server listening on %d, in %s mode’, config.port, app.get(‘env’)); });

经过测试，下面这样搞也可以的，那么为啥源码里要这么搞嘞？求大神啊！！！