css 实现背景图片平铺整个屏幕
#app{ background-image: url(" img/1.jpg ");
background-repeat: no-repeat; //不重复
background-size: 100% 100%; // 满屏
}
#app{ background-image: url(" img/1.jpg ");
background-repeat: no-repeat; //不重复
background-size: 100% 100%; // 满屏
}