使用 create-react-app 创建项目后，执行 build 命令，输出生产环境静态文件。
访问时出错，原因是存在资源路径不对的情况。

create-react-app 给出的解决方案如下：

By default, Create React App produces a build assuming your app is hosted at the server root.

To override this, specify the homepage in your package.json, for example:

  "homepage": "http://mywebsite.com/relativepath",

This will let Create React App correctly infer the root path to use in the generated HTML file.