diff --git a/js/script.js b/js/script.js
index f017c74..46a651e 100644
--- a/js/script.js
+++ b/js/script.js
@@ -1790,8 +1790,16 @@
         const canvas = await generateCanvas();
         console.log('预览画布尺寸:', canvas.width, 'x', canvas.height);
         
+        // 在 toBlob 之前再次确认 canvas 尺寸
+        console.log('预览 toBlob 前 canvas 尺寸:', canvas.width, 'x', canvas.height);
+        
         // 使用 toBlob 获取更高质量的图片
-        const blob = await new Promise(resolve => canvas.toBlob(resolve, 'image/png', 1.0));
+        const blob = await new Promise(resolve => {
+            canvas.toBlob((b) => {
+                console.log('预览 toBlob 回调 - blob 尺寸:', b.size, 'bytes');
+                resolve(b);
+            }, 'image/png', 1.0);
+        });
         console.log('预览图片大小:', (blob.size / 1024).toFixed(2), 'KB');
         const dataUrl = URL.createObjectURL(blob);
         showPreviewModal(dataUrl, blob);
@@ -2273,7 +2281,7 @@
 
         try {
             const canvas = await generateCanvas();
-            await showMobileSaveTip();
+            await showMobileSaveTip(canvas);
         } catch (err) {
             console.error('保存失败:', err);
             alert('保存失败，请重试');
@@ -2281,12 +2289,19 @@
     }
 
     // 显示移动端保存选项
-    async function showMobileSaveTip() {
-        const canvas = exportCanvas;
+    async function showMobileSaveTip(canvas) {
         console.log('导出画布尺寸:', canvas.width, 'x', canvas.height);
         
+        // 在 toBlob 之前再次确认 canvas 尺寸
+        console.log('toBlob 前 canvas 尺寸:', canvas.width, 'x', canvas.height);
+        
         // 使用 toBlob 获取更高质量的图片
-        const blob = await new Promise(resolve => canvas.toBlob(resolve, 'image/png', 1.0));
+        const blob = await new Promise(resolve => {
+            canvas.toBlob((b) => {
+                console.log('toBlob 回调 - blob 尺寸:', b.size, 'bytes');
+                resolve(b);
+            }, 'image/png', 1.0);
+        });
         console.log('导出图片大小:', (blob.size / 1024).toFixed(2), 'KB');
         const dataUrl = URL.createObjectURL(blob);
         const filename = '邀请函_' + Date.now() + '.png';