JSFiddle - React, Tailwind, and code Playground

by OsamaMohamed

HTML

<input type="text" id="name">
<input type="button" id="btn" value="Check">

JavaScript

function check(name){
    if(isNaN(name)){
        alert("Not a Number");
    }else{
       alert("Number");
    }
}
document.getElementById("btn").onclick = function(){
    check(document.getElementById("name").value);
}