如何在另一个 function 中调用 function 并使其运行带有变量的 if 语句？

Question

How can I make it so that when I type in the prompt, the value is stored as a number and refers to the second function?

function driversAge()

    {
    validation();
    var age = prompt("What is your age?");
    }

function validation()

    {
    if(Number(age) === 18){
    alert("You are 18");
    } 

    else if(Number(age) < 18){
    alert("you are below 18");
    } 
    else if(Number(age) > 18){
    alert("You are over 18");
    }
    }

    driversAge();

Answer 1

You could have your driversAge function return the value, then pass it to your validation function.

 function driversAge () { return prompt('What is your age?') } function validation(age) { if (age > 18) { alert("Over 18") } else { alert("Not over 18"); } } const age = driversAge(); validation(age);