如何知道递归函数何时停止调用自身？

Question

有没有办法知道递归函数何时停止调用自己？

我有以下场景：

function print(msg){
  console.log(msg);
  
  if(canContinue){
    print("Hi there");
  }

  if(canContinueCase2){
    setTimeout(()=>{
      print("I was late to the party");
    }, 2000);
  }

  if(canContinueCase3){
    print("Cool right?");
  }

  if(canContinueCase4){
    if(canContinueCase5 && !otherBoolean){
      print("Thank you!");
    }
  }
}

canContinue , canContinueCase2 , ... otherBoolean是全局变量（布尔值）。 如何知道何时不再调用函数print(msg) ？ 换句话说，我怎么知道算法已经停止了？

Answer 1

您可以使用计数器：

 let counter = 0; function print(msg){ console.log(msg); if(canContinue){ counter++; print("Hi there"); } if(canContinueCase2){ counter++; setTimeout(()=>{ print("I was late to the party"); }, 2000); } if(canContinueCase3){ counter++; print("Cool right?"); } if(canContinueCase4){ if(canContinueCase5 && !otherBoolean){ counter++; print("Thank you!"); } } counter--; } counter++; print("hi"); //to check if the function is done, use this: if (counter == 0) { }

Answer 2

您可以在开始时一起测试布尔值。 如果其中任何一个 === true 则未finished

function print(msg){
  let finished = !(canContinue || canContinueCase2 || canContinueCase3 || canContinueCase4 || canContinueCase5 || otherBoolean);
  // ...
}