How is babel used in the project?

1. Manually create the .babelrc file in the project

2. Install

$ npm install --save-dev babel-cli

# ES2015转码规则
$ npm install --save-dev babel-preset-es2015

# react转码规则
$ npm install --save-dev babel-preset-react

# ES7不同阶段语法提案的转码规则（共有4个阶段），选装一个
$ npm install --save-dev babel-preset-stage-0$ npm install --save-dev babel-preset-stage-1$ npm install --save-dev babel-preset-stage-2$ npm install --save-dev babel-preset-stage-3

3. Manually modify the .babelrc file

{"presets": [      "es2015",      "react",      "stage-2"],"plugins": []
  }

4. Modify the package.json file to achieve automatic transcoding. Please remove the comments when copying

{  "scripts": {"build": "babel src -d dist"  //这句表示把src目录下的文件自动转码到dist目录下，dist目录是自动创建的
  },  
}

4. Enter the following command on the command line to transcode

babel src -d dist

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