修复：防止异步响应覆盖与打印资源泄漏

shierfeng-fastapi-frontend/src/views/master/pallet/index.vue

@@ -255,14 +255,25 @@ function handlePrint(row) {
   }
 
   let objectUrl;
+  let closeMonitorId;
+  let cleanupFinished = false;
   setPrinting(row.palletId, true);
-  const revokeObjectUrl = () => {
+  const cleanupPrint = () => {
+    if (cleanupFinished) return;
+    cleanupFinished = true;
+    if (closeMonitorId !== undefined) {
+      window.clearInterval(closeMonitorId);
+      closeMonitorId = undefined;
+    }
     if (objectUrl) {
       URL.revokeObjectURL(objectUrl);
       objectUrl = undefined;
     }
     setPrinting(row.palletId, false);
   };
+  closeMonitorId = window.setInterval(() => {
+    if (printWindow.closed) cleanupPrint();
+  }, 250);
 
   getPalletQrcode(row.palletId).then((qrCodeBlob) => {
     if (printWindow.closed) throw new Error("打印窗口已关闭");
@@ -282,16 +293,12 @@ function handlePrint(row) {
       printWindow.print();
     }, { once: true });
     imageElement.addEventListener("error", () => {
-      revokeObjectUrl();
+      cleanupPrint();
       printWindow.close();
       proxy.$modal.msgError("二维码图片加载失败");
     }, { once: true });
     printWindow.addEventListener("afterprint", () => {
-      if (objectUrl) {
-        URL.revokeObjectURL(objectUrl);
-        objectUrl = undefined;
-      }
-      setPrinting(row.palletId, false);
+      cleanupPrint();
       printWindow.close();
     }, { once: true });
 
@@ -299,7 +306,7 @@ function handlePrint(row) {
     printWindow.document.head.append(styleElement);
     printWindow.document.body.replaceChildren(titleElement, imageElement);
   }).catch(() => {
-    revokeObjectUrl();
+    cleanupPrint();
     if (!printWindow.closed) printWindow.close();
     proxy.$modal.msgError("二维码获取失败");
   });