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front-end-example/06-typescript/06-union-and-optional-props/README.md
charlie f3bdaa4e88 feat: add TypeScript lessons and learning panel 
- Introduced a new script to check TypeScript lesson files for errors.
- Created a main TypeScript file to render lessons and their details.
- Added lesson definitions with starter and answer codes.
- Implemented a user interface for navigating and running lessons.
- Styled the application with CSS for a better user experience.
- Updated README to reflect the new TypeScript section and usage instructions.
2026-03-19 10:06:11 +08:00

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练习 6：联合类型和可选属性

目标

学会处理不固定的数据结构。

你要练什么

  • 联合类型
  • 可选属性
  • 接口扩展场景

任务

  • 定义一个带可选年龄的 User 接口
  • 声明一个 id，它可以是数字或字符串
  • 分别创建有年龄和没有年龄的对象

文件