ght: 'add' };
                stack.value[top.value] = newItem;
                 await nextTick();
                
                notyf.success(`<b>第3步:</b> 元素 '${val}' 已被放置在索引 ${top.value} 处。`);
                
                await sleep(2000);
                newItem.highlight = null;
                inputs.value = '';
                isBusy.value = false;
            };

            const pop = async () => {
                if (isEmpty.value || isBusy.value) { n