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理解TypeScript
source link: https://juejin.im/post/5b5fda80e51d451958671a14
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1、什么是typescript？ TypeScript是JavaScript的一个超集，扩展了JavaScript的语法，本质上向这个语言添加了可选的静态类型和基于类的面向对象编程。任何现有的JavaScript程序可以不加改变的在TypeScript下工作,
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