修改react-native项目到指定react-native版本

以更新项目react-native0.56.0更新为react-native0.55.4版本为例

1 通过指令

进入项目目录，依次输入下列指令：

react-native run-android
//卸载react-native
npm uninstall react-native
//安装0.55.4版本的react-native
npm install --save [email protected]
react-native run-android
npm install --save babel-core@latest babel-loader@latest
npm uninstall --save babel-preset-react-native
npm install --save [email protected]
react-native run-android

2 通过修改package.json

打开项目目录中的package.json文件，

1 dependencies修改为：

 "dependencies": {
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-react-native": "^4.0.0",
    "react": "16.4.1",
    "react-native": "^0.55.4"
  },

2 devDependencies修改：

删除 "babel-preset-react-native": "5.0.2",

3. 然后执行：npm install

文件对比：