框架迁移，好听点说是技术升级，难听点就是“在雷区拆炸弹”。特别是那些老项目，业务逻辑错综复杂，动一点就可能引发连锁反应。有人迁移到一半，发现生态不兼容；有人改着改着，把原本的BUG改成了更棘手的问题；还有人辛苦三个月，最后却被告知“还是用回原来的吧” ...

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Any web based application can be built on the concept of a multi-tier, MVC model. For better maintainability, applications should be designed in such a way that the Presentation Layer and the Business ...

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