Dynamic script loading
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
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JavaScript
console.log('JS');
var underscoreURL = 'https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js';
$((event) => {
var scriptElement = document.createElement("script");
scriptElement.src = underscoreURL;
document.head.appendChild(scriptElement);
eval('console.log(42);');
});