Update index.js

index.js

@@ -30,19 +30,35 @@ app.get('/', (req, res) => {
         </form>
         <script>
             document.getElementById('uploadForm').addEventListener('submit', async (event) => {
-                event.preventDefault();
-                const formData = new FormData(event.target);
-                const response = await fetch(event.target.action, {
-                    method: 'POST',
-                    body: formData
-                });
-
-                if (response.ok) {
-                    alert('File uploaded successfully!');
-                } else {
-                    alert('Failed to upload file.');
-                }
-            });
+    event.preventDefault();
+    const formData = new FormData(event.target);
+    const response = await fetch(event.target.action, {
+        method: 'POST',
+        body: formData
+    });
+
+    if (response.ok) {
+        // 假设服务器返回的是一个可下载的文件
+        response.blob().then(blob => {
+            // 创建一个链接元素
+            const url = window.URL.createObjectURL(blob);
+            const a = document.createElement('a');
+            a.style.display = 'none';
+            a.href = url;
+            // 从Content-Disposition头中提取文件名
+            const contentDisposition = response.headers.get('Content-Disposition');
+            const fileName = contentDisposition.match(/filename="(.+)"/)[1];
+            a.download = fileName;
+            document.body.appendChild(a);
+            a.click();
+            window.URL.revokeObjectURL(url);
+            alert('File downloaded successfully!');
+        });
+    } else {
+        alert('Failed to upload file.');
+    }
+});
+
         </script>
     </body>
     </html>