修改样式

src/components/m-image-preview/index.module.less

@@ -8,6 +8,10 @@
   --van-image-preview-close-icon-size: 32px;
   --van-image-preview-index-line-height: 32px;
 
+  .videSection {
+    height: 100%;
+  }
+
   :global {
     .van-image-preview__cover {
       // top: calc(var(--van-padding-md) + constant(safe-area-inset-bottom));

src/components/m-image-preview/index.tsx

@@ -238,7 +238,7 @@ export default defineComponent({
                     <Image class="van-image-preview__image" src={url} />
                   ) : (
                     <div
-                      class="van-image-preview__image"
+                      class={['van-image-preview__image', styles.videSection]}
                       onClick={(e: MouseEvent) => {
                         e.stopPropagation();
                         e.preventDefault();