I've done it to be honest but I feel like writing extra code. I want a shortcut

The code is:

let num1 = +prompt("enter a number");
let num2 = +prompt("enter a number");

if(isNaN(num1) || isNaN(num2) || num1 == num2) {
    alert("Error!")
} else{
    let smallnum = 0, bignum = 0;
    if (num1 > num2){
        smallnum = num2;
        bignum= num1;
    } else{
        smallnum = num1;
        bignum = num2;
    }
    i = smallnum + 1;
    while(i < bignum){
        if (i % 2 == 1){
            i++;
            console.log(i);
        } else {
            console.log(i);
        }
        i += 2;
    }
}

and please tell me whether I've written well or not.