* [bug#68525,doing,2h] add export button for attachment library.

lib/zin/wg/docapp/js/v1.js

@@ -1265,7 +1265,13 @@ const actionsMap =
             canEdit ? {hint: lang.fileRename, icon: 'pencil-alt', onClick: renameDocFile.bind(this, file, doc)} : null,
             canDelete ? {hint: lang.fileDelete, icon: 'trash', onClick: deleteDocFile.bind(this, file, doc)} : null,
         ].filter(Boolean);
-    }
+    },
+
+    'file-list': function(info)
+    {
+        return [hasPriv('exportFiles') ? {icon: 'export', text: getLang('export'), command: 'exportFiles'} : null];
+    },
+
 };
 
 function getActions(type, info)
@@ -1842,6 +1848,21 @@ const commands =
         const url = $.createLink('ai', 'promptExecute', `promptId=${promptID}&objectId=${docID}&auto=0`);
         $.ajaxSubmit({url: url, method: 'POST'});
     },
+
+
+    /**
+     * 批量导出附件库中的附件。
+     * Batch export attachments in the attachment library.
+     */
+    exportFiles: function(_, args)
+    {
+        const docApp     = getDocApp();
+        const objectID   = docApp.spaceID;
+        const objectType = docApp.spaceType;
+
+        const url = $.createLink('doc', 'exportfiles', `objectID=${objectID}&objectType=${objectType}`);
+        zui.Modal.open({url: url, size: 'sm'});
+    }
 };
 
 function getApiID(id)
@@ -2089,7 +2110,8 @@ function getTableOptions(options, info)
     }
     if(info.type === 'file-list')
     {
-        const tableCols = lang.fileTableCols;
+        const tableCols      = lang.fileTableCols;
+        const canExportFiles = hasPriv('exportFiles');
         options.cols.forEach(col =>
         {
             if(typeof tableCols[col.name] === 'string') col.title = tableCols[col.name];
@@ -2108,7 +2130,19 @@ function getTableOptions(options, info)
                     return onRenderCellBackup.call(this,result,info);
                 }
             }
+            if(col.name === 'id' && canExportFiles) col.checkbox = true;
         });
+
+        if(canExportFiles)
+        {
+            options.checkable = true;
+            options.onCheckChange = function(changes)
+            {
+                const checkedList = this.getChecks();
+                $.cookie.set('checkedFileItem', checkedList, {expires:config.cookieLife, path:config.webRoot});
+            }
+        }
+        return options;
     }
     if(!hasPriv('batchMoveDoc') && !hasPriv('exportDoc'))
     {