JavaScriptでの複数キー入力受付 - Qiita

const controller = {}; const showController = () => { const elem = document.getElementById("debug-controller"); let controllerStr = ""; Object.keys(controller).forEach(key => { controllerStr += `${key}:${controller[key]} \n`; }); elem.innerText = controllerStr } document.addEventListener('keydown', (event) => { console.log(`keydown:${event.code}`); controller[event.code] = true; showController();