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TS学习记录 #70

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wuyanqian0503 opened this issue Aug 18, 2021 · 1 comment

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wuyanqian0503 commented Aug 18, 2021 •

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学习目标

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wuyanqian0503 commented Aug 18, 2021

TS和JS的区别

最大的区别就是TS在JS的基础上提供了类型系统，并且通过这个类型系统支持了静态类型校验。

由于JS是动态类型语言，松散的类型导致代码容易出现运行错误。TS通过静态类型校验，在运行代码前对代码进行类型校验，测试代码的正确性，提高代码的可读性以及可维护性。

TS中有哪些类型

原始类型：string、number、boolean
特殊类型：null、undefined、any、void（函数没有返回值）、never（永远不存在值，类型保护）
元祖类型：已知元素类型和长度的数组
枚举类型：数字枚举、字符串枚举
高级类型：联合类型、交叉类型

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