npm调试

1.npm install

https://nodejs.org/en/download/ please select lastest version

2.npm update

npm -v :show verson

npm install npm -g : npm update

npm install npm -g C:\Users\dev\AppData\Roaming\npm\npm -> C:\Users\dev\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js C:\Users\dev\AppData\Roaming\npm\npx -> C:\Users\dev\AppData\Roaming\npm\node_modules\npm\bin\npx-cli.js + npm@6.14.8

3 npm registory to taobao.org

npm install -g cnpm --registry=https//registry.npm.taobao.org

4.npm install -g create-react-app

5 create react-app h5sample

create-react-app h5sample The directory h5sample contains files that could conflict:

  configs/   dist/   README.md.txt

Either try using a new directory name, or remove the files listed above.

D:\reactproject>create-react-app h5sample

Creating a new React app in D:\reactproject\h5sample.

Installing packages. This might take a couple of minutes. Installing react, react-dom, and react-scripts with cra-template...

[..................] / rollbackFailedOptional: verb npm-session 59d1efa08aa5e9c9