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https://daozhihun.com/2013/07/10/%e4%be%9d%e8%b5%96%e6%b3%a8%e5%85%a5dependency-injection%e6%a8%a1%e5%bc%8f%e7%9a%84%e5%ad%a6%e4%b9%a0%ef%bc%881%ef%bc%89-%e5%bc%95%e5%ad%90/
依赖注入(Dependency Injection)模式的学习(1)——引子