<div class="nav-item"><div class="ic-img"></div><div>切换</div>
</div>.nav-item {width: 100rem;height: 45rem;line-height: 45rem;display: flex;text-align: center;justify-content: center;align-items: center;color: white;cursor: pointer;.ic-img {width: 20px;height: 20px;margin-right: 5px;background-size: 100% 100%;background-image: url('@/assets/ic.png');}&:hover {color: #1be7e0;.ic-img {background-image: url('@/assets/ic-actived.png');}}}
关键点：把图片作为背景设置，以此实现Hover时动态切换的效果；
