let i = void 2; // i === undefined

void function() {
 console.log('What')
}()

void function aRecursion(i) {
 if(i > 0) {
  console.log(i--)
  aRecursion(i)
 }
}(3)

console.log(typeof aRecursion) // undefined

// returning something else than undefined would crash the app
function middleware(nextCallback) {
 if(conditionApplies()) {
  return void nextCallback();
 }
}

button.onclick = () => void doSomething();

function iHaveNoReturnValue(i) {
 console.log(i)
} // returns undefined

declare function iHaveNoReturnValue(i: number): void

declare function iTakeNoParameters(x: void): void

iTakeNoParameters() // "htmlcode">

function doSomething(callback: () => void) {
 let c = callback() // at this position, callback always returns undefined
 //c is also of type undefiend
}

// this function returns a number
function aNumberCallback(): number {
 return 2;
}

// works "htmlcode">

- function doSomething(callback: () => void) {
+ function doSomething(callback: () => undefined) { /* ... */ }

function aNumberCallback(): number { return 2; }

// 💥 types don't match
doSomething(aNumberCallback) 




大概大部分时间你都能和 void 很好的相处。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。