Unable to load script. Make sure you're either running a Metro server (run 'react-native start') ...

Unable to load script. Make sure you're either running a Metro server (run 'react-native start') or that your bundle Unable to load script. Make sure you're either running a Metro server (run 'react-native start') or that your bundle "index.android.bundle' is packaged correctly for release.

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当我们遇到这个问题
打开自己得app,点击右侧更多->摇一摇->Dev Setting->debugging->Debug Server Host，输入本电脑的IP :8081,确定，返回

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l在模拟器自己的app界面中，双击键盘RR 刷新调试程序

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当出现这个时候 差不多就没问题了