python Documentation
现代 JavaScript 教程：有关示例和任务的简单但详细的解释包括：闭包、文档和事件，以及面向对象编程等。
TypeScript extends JavaScript by adding types to the language. TypeScript speeds up your development experience by catching errors and providing fixes before you even run your code.
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
