JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container1">
    Testing...
</div>
<div id="container2">
</div>

CSS

#container1{
    background-color: green;
}

JavaScript

var counter = 0;

$('#container1').on('mouseenter', function(){
    $('#container2').text('First mouseenter');
    appendingAnotherMouseEnter();
});

function appendingAnotherMouseEnter(){
    $('#container1').on('mouseenter', function(){
        $('#container2').text(counter);
        counter++;
    });
}