JSFiddle - React, Tailwind, and code Playground

by asle

HTML

<p>This is some text</p>
<span class="cm">Click me</span>

CSS

body, html {
    font:12px verdana
}
.cm {
    background-color:#ccc
}

JavaScript

$(function () {


    $(".cm").click(function () {
        // alert("mc");
        var a = prompt("Check this value:")
           alert(isNaN(a));
            alert(a !== a);
    })

    var a = NaN;

    return (a !== a); // true 
});
//alert(isNaN('abcd')); // alerts true
//alert(isNaN('2.0')); // alerts false
//alert(isNaN(2.0));