JSFiddle - React, Tailwind, and code Playground

HTML

<script>
    function change(e) {
        console.log(e.checked);
    }
</script>
<input type="checkbox" id="c">
<input type="checkbox" id="c1" onchange="change(this)">

JavaScript

var c = document.getElementById('c');
c.onchange = function () {
    console.log(this.checked);
};