if (!selectedOrder.includes(metal)) {
element.classList.add('selected');
selectedOrder.push(metal);
document.getElementById('confirmBtn'
).disabled = selectedOrder.length !==
currentRoundMetals.length;
document.getElementById('confirmBtn'
).addEventListener('click', () => {
const isCorrect = selectedOrder.every((metal,
index) => metal.order ===
currentRoundMetals[index].order);
document.getElementById('result').textContent
= '正确!进入下一关。';
setTimeout(startNewRound, 1000);
document.getElementById('result').textContent
= '错误!请重试。';
document.querySelectorAll('.option'
).forEach(option => option.classList
.remove('selected'));