f3bdaa4e88
- 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.
练习 12：prepend、classList.remove 和链接默认行为
目标
补齐几个常见但容易漏掉的 DOM 细节操作。
你要练什么
prepend()classList.remove()- 链接点击事件
preventDefault()
任务
- 点击“插入到最前面”时，把一条新消息插入列表顶部
- 点击“清除高亮”时，移除全部高亮类名
- 点击帮助链接时，阻止默认跳转，并在页面显示提示信息