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                # 類型別名 類型別名用來給一個類型起個新名字。 ## 簡單的例子 ```ts type Name = string; type NameResolver = () => string; type NameOrResolver = Name | NameResolver; function getName(n: NameOrResolver): Name { if (typeof n === 'string') { return n; } else { return n(); } } ``` 上例中,我們使用 `type` 創建類型別名。 類型別名常用于聯合類型。 ## 參考 - [Advanced Types # Type Aliases](http://www.typescriptlang.org/docs/handbook/advanced-types.html#type-aliases)([中文版](https://zhongsp.gitbooks.io/typescript-handbook/content/doc/handbook/Advanced%20Types.html#類型別名)) --- - [上一章:進階](../advanced/README.md) - [下一章:字符串字面量類型](string-literal-types.md)
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