使用 if else 语句提示 javascript 的函数

Question

So I have been racking my brain why this doesn't work, I am sure that I am over thinking it but after googling for a few hours I just can't find it.

So the main thing I am trying is to create a JavaScript function “legs” which takes animal Object and returns some custom message (String) if the animal has 0 legs, 2, 4, and one message for others.

My attempt:

var animal = prompt("Type in an animal")

function legs(animal){

    if(animal == 'fish'){
        return "no legs";
    }else if(animal == 'Tiger'){
        return "4 legs";
    }else if(animal == 'kangaroo'){
        return "2 legs";
    }else { 
        return "I don't know";
        }
}

What am I doing wrong?

Answer 1

You need to call legs function like legs(animal)

 var animal = prompt("Type in an animal") function legs(animal){ if(animal == 'fish'){ return "no legs"; }else if(animal == 'Tiger'){ return "4 legs"; }else if(animal == 'kangaroo'){ return "2 legs"; }else { return "I don't know"; } } console.log(legs(animal));

Answer 2

this way you can call the leg() function.

 var animal = prompt("Type in an animal") function legs(animal) { if (animal == 'fish') return "no legs"; else if (animal == 'Tiger') return "4 legs"; else if (animal == 'kangaroo') return "2 legs"; else return "I don't know"; } let result = legs(animal) console.log(result)

Answer 3

Just improving the answer. You to get the answer you need to call the function you have defined. Anyway better (cleaner) if you define it before reaching the interactive part (prompt).

Since you are returning in each scenario you do not need to use an else.

function legs(animal) {
  if (animal == 'fish') 
    return "no legs";
  if (animal == 'Tiger') 
    return "4 legs";
  if (animal == 'kangaroo') 
    return "2 legs";

  return "I don't know";
}

const animal = prompt("Type in an animal");

console.log(legs(animal));