http://china-city-example.herokuapp.com/
git clone https://github.com/saberma/china_city_example.git
cd china_city_example
bundle
rails s
访问 http://localhost:3000/ 即可看到效果。
可以参考 https://github.com/saberma/china_city_example/commit/e57aa13584c2769bc94eea4fdbdfb4323091af2f