document.addEventListener('keydown', (event) => { const keyName = event.key; if(keyName=="d"){ if(this.gui){ if(this.gui.domElement.style.display=="none"){ this.gui.domElement.style.display="block"; this.stats.domElement.style.display="block"; }else{ this.gui.domElement.style.display="none"; this.stats.domElement.style.display="none"; } } } });