nanhuashi_applet/uni_modules/windi-css-uniapp/modules/backgrounds.scss

/* #ifndef APP-NVUE */
// 背景固定
.#{$prefix}bg-fixed {
  background-attachment: fixed;
}
.#{$prefix}bg-local {
  background-attachment: local;
}
.#{$prefix}bg-scroll {
  background-attachment: scroll;
}

// 背景裁剪
.#{$prefix}bg-clip-border {
  background-clip: border-box;
}
.#{$prefix}bg-clip-padding {
  background-clip: padding-box;
}
.#{$prefix}bg-clip-content {
  background-clip: content-box;
}
/* #endif */

// 背景颜色
.#{$prefix}bg-transparent {
  background-color: transparent;
}
/* #ifndef APP-NVUE */
.#{$prefix}bg-current {
  background-color: currentColor;
}
/* #endif */
.#{$prefix}bg-000,
.#{$prefix}bg-black {
  background-color: #000;
}
.#{$prefix}bg-fff,
.#{$prefix}bg-white {
  background-color: #fff;
}
@for $i from 1 through 9 {
  .#{$prefix}bg-#{$i * 111} {
    background-color: unquote("##{$i * 111}");
  }
}

/* #ifndef APP-NVUE */
// 背景颜色不透明度

// 背景图像位置
.#{$prefix}bg-bottom {
  background-position: bottom;
}
.#{$prefix}bg-center {
  background-position: center;
}
.#{$prefix}bg-left {
  background-position: left;
}
.#{$prefix}bg-left-bottom {
  background-position: left bottom;
}
.#{$prefix}bg-left-top {
  background-position: left top;
}
.#{$prefix}bg-right {
  background-position: right;
}
.#{$prefix}bg-right-bottom {
  background-position: right bottom;
}
.#{$prefix}bg-right-top {
  background-position: right top;
}
.#{$prefix}bg-top {
  background-position: top;
}

// 背景图像重复
.#{$prefix}bg-repeat {
  background-repeat: repeat;
}
.#{$prefix}bg-repeat-x {
  background-repeat: repeat-x;
}
.#{$prefix}bg-repeat-y {
  background-repeat: repeat-y;
}
.#{$prefix}bg-repeat-round {
  background-repeat: round;
}
.#{$prefix}bg-repeat-space {
  background-repeat: space;
}

// 背景图像大小
.#{$prefix}bg-auto {
  background-size: auto;
}
.#{$prefix}bg-cover {
  background-size: cover;
}
.#{$prefix}bg-contain {
  background-size: contain;
}

// 背景图像原点
.#{$prefix}bg-origin-border {
  background-origin: border-box;
}
.#{$prefix}bg-origin-padding {
  background-origin: padding-box;
}
.#{$prefix}bg-origin-content {
  background-origin: content-box;
}
/* #endif */