feat: 修改默认导出倍率

src/example/fuse/views/tabulation/header.vue

@@ -55,7 +55,7 @@ const getCoverImage = (format: string) => {
     };
 
     let fileBlob = await (draw.stage!.toBlob({
-      pixelRatio: 4,
+      pixelRatio: 2,
       mimeType: format,
       quality: 1,
       ...rect,