The main difference between TypeScript and JavaScript is that TypeScript is a static type language, while JavaScript is a dynamic type language.
Specifically, TypeScript has the following features:
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Type annotations: TypeScript allows type annotations to be added to variables, parameters, functions, objects, etc., clearly specifying the type of each value, thereby improving code readability and maintainability.
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Type inference: TypeScript can automatically infer the type of each value based on the code context, simplifying the coding process.
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Static checking: TypeScript performs static checking on the code during compilation, which can catch many common errors and improve code reliability and security.
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Support for the latest JavaScript syntax: TypeScript supports the latest JavaScript syntax, such as ES6, ES7, and ES8, allowing developers to use the latest language features to write code.
Overall, TypeScript enhances code readability, maintainability, and reliability by adding a type system and static checking, and also makes it easier for developers to use the latest JavaScript language features.
TypeScript 跟 JavaScript 最主要的差異在於 TypeScript 是一種靜態類型語言，而 JavaScript 是一種動態類型語言。
具體而言，TypeScript 具有以下特點：
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型別註解：TypeScript 可以在變數、參數、函數、物件等處添加型別註解，明確指定每個值的型別，從而提高了代碼的可讀性和可維護性。
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型別推斷：TypeScript 可以根據代碼上下文自動推斷出每個值的型別，簡化了代碼的撰寫過程。
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靜態檢查：TypeScript 在編譯時對代碼進行靜態檢查，可以捕捉到許多常見的錯誤，從而提高了代碼的可靠性和安全性。
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支持最新的 JavaScript 語法：TypeScript 支持最新的 ES6、ES7、ES8 等 JavaScript 語法，可以讓開發人員使用最新的語言特性來編寫代碼。
總的來說，TypeScript 通過增加類型系統和靜態檢查等特性，可以提高代碼的可讀性、可維護性和可靠性，同時也能夠讓開發人員更加輕鬆地使用最新的 JavaScript 語言特性。