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                # 任意值 任意值(Any)用來表示允許賦值為任意類型。 ## 什么是任意值類型 如果是一個普通類型,在賦值過程中改變類型是不被允許的: ```ts let myFavoriteNumber: string = 'seven'; myFavoriteNumber = 7; // index.ts(2,1): error TS2322: Type 'number' is not assignable to type 'string'. ``` 但如果是 `any` 類型,則允許被賦值為任意類型。 ```ts let myFavoriteNumber: any = 'seven'; myFavoriteNumber = 7; ``` ## 任意值的屬性和方法 在任意值上訪問任何屬性都是允許的: ```ts let anyThing: any = 'hello'; console.log(anyThing.myName); console.log(anyThing.myName.firstName); ``` 也允許調用任何方法: ```ts let anyThing: any = 'Tom'; anyThing.setName('Jerry'); anyThing.setName('Jerry').sayHello(); anyThing.myName.setFirstName('Cat'); ``` 可以認為,**聲明一個變量為任意值之后,對它的任何操作,返回的內容的類型都是任意值**。 ## 未聲明類型的變量 **變量如果在聲明的時候,未指定其類型,那么它會被識別為任意值類型**: ```ts let something; something = 'seven'; something = 7; something.setName('Tom'); ``` 等價于 ```ts let something: any; something = 'seven'; something = 7; something.setName('Tom'); ``` ## 參考 - [Basic Types # Any](http://www.typescriptlang.org/docs/handbook/basic-types.html#any)([中文版](https://zhongsp.gitbooks.io/typescript-handbook/content/doc/handbook/Basic%20Types.html#任意值)) --- - [上一章:原始數據類型](primitive-data-types.md) - [下一章:類型推論](type-inference.md)
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