How do i put switch inside if condition??

Question

I want to put switch inside if condition. And the switch has a variable that contain a value of Number(prompt()). If i try to run the code, nothing appears. See what i mean:

var s1 = Number(prompt("Which Number?"));
if(s1 == Number)
{
switch(s1)
{
case "1":
document.write(" I am number 1");
break;
case "2":
document.write(" I am number 2");
break;
case "3":
document.write(" I am number 1");
break;
default:
document.write("No number found");

}
}

Answer 1

if(typeof(s1)=="number")

Answer 2

Currently you are checking if a value is equal to function. Check if s1 is not NaN.

if (!isNaN(s1)) {

}