JSFiddle - React, Tailwind, and code Playground

by btipling

HTML

<form onsubmit="return false;">
        <input id="b1" type="submit"  value="Click" />

    </form>

    <script>
       //global variable 
       var v= 0;

       var b1= document.getElementById("b1");

       b1.addEventListener("click", f1, false);

       function f1() {
           window.alert(++v);
       }

    </script>