function loadScript(url, callback) { const element = document.createElement("script"); element.type = "text/javascript"; element.src = url; element.onload = callback; document.body.appendChild(element); } loadScript("js/common.js", () => { loadScript("<https://cdn.jsdelivr.net/npm/[email protected]/build/global/luxon.min.js>", () => { console.log("timer.js ") }) })