message: [improvement] Switch: loading color use active-color
diff: import { use } from '../utils';
  -import Loading from '../loading';
  +import { BLUE } from '../utils/color';
  import { switchProps, SharedSwitchProps } from './shared';
  import { emit, inherit } from '../utils/functional';
  +import Loading from '../loading';
  // Types
  import { CreateElement, RenderContext } from 'vue/types';
  @@ -45,7 +46,7 @@ function Switch(
  {...inherit(ctx)}
  >
  <div class={bem('node')}>
  - {loading && <Loading class={bem('loading')} />}
  + {loading && <Loading class={bem('loading')} color={props.activeColor || BLUE} />}
  </div>
  </div>
  );
  