update

js/Desktop/DeskTop.js

@@ -11603,11 +11603,23 @@ U.MD.D.I.downloadFile = function (cid, s, task, t, uid, type, text, loading, spa
         }
         let file = fileObj.dataURL;
         if (file) {
-            let ext = (file.name && file.name.split('.').pop()) || 'png';
-            let basename = (file.name && file.name.split('.')[0]) || ('file_' + key);
+            // fileObj 结构类似:
+            // {
+            //   name: "file_3344aa4c0fa552dc01cb2fe5edb6e4eb3aed9e39",
+            //   size: 12034,
+            //   type: "image/jpeg",
+            //   webkitRelativePath: "",
+            //   dataURL: File对象
+            // }
+            let ext = (fileObj.name && fileObj.name.lastIndexOf('.') !== -1)
+                ? fileObj.name.substring(fileObj.name.lastIndexOf('.') + 1)
+                : (file.type ? file.type.split('/')[1] : 'png');
+            let basename = (fileObj.name && fileObj.name.lastIndexOf('.') !== -1)
+                ? fileObj.name.substring(0, fileObj.name.lastIndexOf('.'))
+                : (fileObj.name || ('file_' + key));
             var params = {
                 Key: basename + '_' + new Date().getTime() + "." + ext,
-                ContentType: file.type,
+                ContentType: fileObj.type || file.type || 'application/octet-stream',
                 Body: file,
                 "Access-Control-Allow-Credentials": "*",
                 ACL: "public-read",