vant-weapp/packages/switch/index.less

@import '../common/style/var.less';
@import '../common/style/theme.less';

.van-switch {
  position: relative;
  display: inline-block;
  box-sizing: content-box;
  .theme(width, '@switch-width');
  .theme(height, '@switch-height');
  .theme(background-color, '@switch-background-color');
  .theme(border, '@switch-border');
  .theme(border-radius, '@switch-node-size');
  .theme(transition, 'background-color @switch-transition-duration');

  &__node {
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 100%;
    .theme(z-index, '@switch-node-z-index');
    .theme(width, '@switch-node-size');
    .theme(height, '@switch-node-size');
    .theme(background-color, '@switch-node-background-color');
    .theme(box-shadow, '@switch-node-box-shadow');
    .theme(transition, 'transform @switch-transition-duration cubic-bezier(.3, 1.05, .4, 1.05)');
  }

  &__loading {
    position: absolute !important;
    top: 25%;
    left: 25%;
    width: 50%;
    height: 50%;
  }

  &--on {
    .theme(background-color, '@switch-on-background-color');

    .van-switch__node {
      .theme(transform, 'translateX(calc(@switch-width - @switch-node-size))');
    }
  }

  &--disabled {
    .theme(opacity, '@switch-disabled-opacity');
  }
}