html代码<div class=“file-container”> <input type=“file” name=“img”></div>css 代码.file-container { position: relative; width: 7rem; height: 6rem; background: url(’../common/images/ui/组1.png’) center center no-repeat; background-size: 100%;}.file-container input { position: absolute; display: block; width: 100%; height: 100%; right: 0; top: 0; opacity: 0;}input 撑满父容器，透明度设置为0，就可以随意设置父元素样式了。效果：