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TS中never和void的区别 #135

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GGXXMM opened this issue Apr 14, 2023 · 0 comments
Open

TS中never和void的区别 #135

GGXXMM opened this issue Apr 14, 2023 · 0 comments

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@GGXXMM
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GGXXMM commented Apr 14, 2023

  • never 表示永不存在的值类型
// 异常
function err(msg: string): never { // OK
    throw new Error(msg); 
}
// 死循环
function loopForever(): never { // OK
    while (true) {};
}
  • void 表示没有任何值返回的类型
function warnUser(): void {
    console.log("This is my warning message");
}

总结:拥有 void 类型的函数能正常运行,仅无返回值;拥有 never 类型的函数无法正常返回,无法终止,或是会抛出异常。

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