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React Native最近有大动作，于2019年3月12日发布新版本0.59。主要有两点值得升级：支持React Hooks；升级了JavaScriptCore，使Android性能有大幅提升。据用过的人说，长列表快速滑动而产生的白屏得到大大改善。这么好的东西得赶紧体验一下啊。
简单的执行npm install react-native@latest会导致很多配置文件得不到更新。react-native-git-upgrade在0.59已被废弃，现在推荐使用rn-diff-purge，并且从0.59开始支持基于rn-diff-purge的简单升级cli：react-native upgrade。不过当前项目版本是0.58.4，老老实实研究rn-diff-purge。
升级Recommended method
登录rn-diff-purge网站，输入项目当前版本号：0.58.4；目标版本号：0.59.2，点击“Diff here”，会生成一个类似于git log的修改记录：
2. 手动修改差异
对照上面
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