我试图用react CDN脚本测试我的 React应用（由create-react-app创建）的性能，并且我做了'npm run弹出'来添加webpack externals依赖关系react和react-dom。
我在 webpack配置和<script>
index.html中轻松做到了
...
externals: {
react: 'React',
'react-dom':'ReactDOM'
},
...
现在我想将其恢复为以前的状态
我正在使用 git ，并且在单独的分支中进行了此实验。
我跑了git checkout master和npm start
结果很烦人
> myapp@0.18.1 start /home/code/serverSync/myapp/ui
> react-scripts start
sh: 1: react-scripts: not found
npm ERR! Linux 4.15.0-23-generic
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "start"
npm ERR! node v8.10.0
npm ERR! npm v3.5.2
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! myapp@0.18.1 start: `react-scripts start`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the myapp@0.18.1 start script 'react-scripts start'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the myapp package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! react-scripts start
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs myapp
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls myapp
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /home/code/serverSync/myapp/ui/npm-debug.log
我如何恢复到主分支？
答案 0 :(得分：4)
您可以通过添加 react-scripts 包来撤消Create React App应用程序的“弹出”操作。根据您最喜欢的包装管理器
来命令yarn或npm您所做的：
$ yarn run eject/ npm run eject
? Are you sure you want to eject? This action is permanent. (Yes/No)Yes
现在的解决方案是：-
$ rm -r scripts/ //Remove Your scripts folder
$ rm -r config/ //Remove Your config folder
$ rm -r node_modules// //Remove Your node_modules folder
然后使用
重新添加反应脚本程序包
$ yarn add react-scripts / npm install react-scripts
在 package.json 文件中，您需要将“脚本” 更改为以前的状态：
"scripts": {
+ "start": "react-scripts start",
+ "build": "react-scripts build",
+ "test": "react-scripts test --env=jsdom",
+ "eject": "react-scripts eject"
- "start": "node scripts/start.js",
- "build": "node scripts/build.js",
- "test": "node scripts/test.js --env=jsdom"
}
现在使用以下命令安装所有依赖项：-
$ yarn install / npm install
你很好走
$ yarn start / npm start
您做到了.....
答案 1 :(得分：3)
如果您现在位于import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
double x=input.nextDouble();
x = (xe3) + (xe2) + x + 1;
System.out.println(x);
}
}
分支（其配置与之前的master相同），请尝试执行以下操作。
npm run eject node_module npm install 答案 2 :(得分：0)
删除，然后提到的npm install方法是正确的。但是，如果您使用的是git（或仅使用任何版本控制），请执行以下操作：
git checkout -- .
或：
git stash