diff --git a/resources/qiye.html b/resources/qiye.html
index f9b0d01..164c786 100644
--- a/resources/qiye.html
+++ b/resources/qiye.html
@@ -2241,6 +2241,23 @@
                                                     restoreBtn();
                                                     return;
                                                 }
+                                                // 调试：确认截图是否全白/是否有内容
+                                                try {
+                                                    var ctx2d = canvas.getContext("2d");
+                                                    if (ctx2d) {
+                                                        var p = ctx2d.getImageData(0, 0, 1, 1).data;
+                                                        console.info(
+                                                            "PDF截图信息",
+                                                            {
+                                                                w: canvas.width,
+                                                                h: canvas.height,
+                                                                firstPixel: Array.prototype.slice.call(p),
+                                                            },
+                                                        );
+                                                    }
+                                                } catch (e) {
+                                                    console.warn("读取截图像素失败（可能被跨域资源污染）", e);
+                                                }
                                                 var imgData = canvas.toDataURL(
                                                     "image/jpeg",
                                                     0.95,