JSFiddle - React, Tailwind, and code Playground

HTML

<button class="test-me">
    Test me!
</button>

JavaScript

function fetchPost(id) {
	id = id || 66;
    
	var jQueryPromise = $.ajax({
    	'url': 'https://jsonplaceholder.typicode.com/posts/' + id
	});
    
    return Promise.resolve(jQueryPromise);
}

var postIds = [ 2, 4, 7, 42 ];

$('.test-me').on('click.test-me', function() {
    Promise.all(postIds.map(fetchPost)).then(function(results) {
        alert(JSON.stringify(results));
    });
});