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### 作用
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为了解决同一个流程不同业务有不同处理逻辑而产生，减少代码中 if else 逻辑，降低代码的耦合性，通过统一的扩展形式来支撑业务的变化。
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### 原理
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https://blog.csdn.net/significantfrank/article/details/100074716
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### 使用介绍
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参考测试代码 `cn.iocoder.yudao.framework.extension.ExtensionTest`
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