示例
执行以下命令创建 Express 4 应用程序:
Execute the following command to create an Express 4 app:
$ express app4
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$ npm start
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app.set('port', process.env.PORT || 3000)
var server = app.listen(app.get('port'), () => {
debug('Express server listening on port ' + server.address().port)
})
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var debug = require('debug')('app4')
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