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front-end-example/04-dom-events-async/01-query-selectors/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 1：获取元素

目标

学会用几种常见方式拿到页面元素。

你要练什么

  • getElementById
  • querySelector
  • querySelectorAll
  • 元素文本读取

任务

请基于页面结构完成以下操作：

  • 选中主标题
  • 选中“开始学习”按钮
  • 选中全部学习卡片
  • 在控制台输出标题文字、按钮文字和卡片数量

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