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void 类型不能赋值为null #125

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void 类型不能赋值为null #125

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void 类型不能赋值为null
calebxx Apr 17, 2020
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Update primitive-data-types.md
calebxx Apr 17, 2020
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calebxx Apr 17, 2020
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Expand Up @@ -104,7 +104,7 @@ function alertName(): void {
}
```

声明一个 `void` 类型的变量没有什么用，因为你只能将它赋值为 `undefined` 和 `null`：
声明一个 `void` 类型的变量没有什么用，因为你只能将它赋值为 `undefined`，默认情况下 ts-config 的配置是：```strictNullChecks: true```，所以void 也不能赋值为`null`：

```ts
let unusable: void = undefined;
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