**注**:spring.profiles属性可以定义到一个YAML文档中,用于决定什么时候该文档被包含进配置中。具体参考[Section 63.6, “Change configuration depending on the environment”](http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-change-configuration-depending-on-the-environment)