react：修改项目默认端口的方式

Linux 下修改方法

修改 package.json 文件下 scripts 节点下的 start 的值，如下所示

"scripts": {
    "start": "PORT=9000 react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }

Windows 下修改方法

修改 package.json 文件下 scripts 节点下的 start 的值，如下所示

"scripts": {
    "start": "set PORT=9000 && react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }