本文介绍了打字稿类型“字符串"不可分配给类型的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这是我在fruit.ts中的内容
Here's what I have in fruit.ts
export type Fruit = "Orange" | "Apple" | "Banana"现在我在另一个打字稿文件中导入fruit.ts.这是我所拥有的
Now I'm importing fruit.ts in another typescript file. Here's what I have
myString:string = "Banana"; myFruit:Fruit = myString;当我这样做
myFruit = myString;我收到一个错误:
类型 'string' 不能分配给类型 '"Orange" |苹果" |香蕉"'
Type 'string' is not assignable to type '"Orange" | "Apple" | "Banana"'
如何将字符串分配给自定义类型 Fruit 的变量?
How can I assign a string to a variable of custom type Fruit?
推荐答案您需要投它:
export type Fruit = "Orange" | "Apple" | "Banana"; let myString: string = "Banana"; let myFruit: Fruit = myString as Fruit;另请注意,在使用 字符串文字时 你只需要使用一个 |
Also notice that when using string literals you need to use only one |
正如@Simon_Weaver 在另一个答案中提到的,现在可以将其断言为 const:
As mentioned in the other answer by @Simon_Weaver, it's now possible to assert it to const:
let fruit = "Banana" as const;更多推荐
打字稿类型“字符串"不可分配给类型
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