Typescript类型'string'不能分配给类型 [英] Typescript Type 'string' is not assignable to type

问题描述

这就是我在fruit.ts中的含义。

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.这就是我拥有的东西

Now I'm importing fruit.ts in another typescript file. Here's what I have

myString:string = "Banana";

myFruit:Fruit = myString;

当我这样做时

myFruit = myString;

我收到错误消息：

类型'字符串'不能分配给类型'Orange| Apple|
Banana'

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

你需要强制转换：

export type Fruit = "Orange" | "Apple" | "Banana";
let myString: string = "Banana";

let myFruit: Fruit = myString as Fruit;

还要注意使用字符串文字您只需要使用一个 |

Also notice that when using string literals you need to use only one |

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