出现原因端口被占用
解决办法: 第一种, http://www.mamicode.com/info-detail-2727491.html
第二种 关机重启，重新跑项目最直接
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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