导出无数据时展示 -

api/app/lib/utils/xlsxDownload.js

@@ -59,7 +59,7 @@ module.exports = function (app, opts) {
          indexCell.style = headerStyle
          for (let h of header) {
             const cell = row.addCell();
-            cell.value = data[i][h.key] || h.defaultValue || '';
+            cell.value = data[i][h.key] || h.defaultValue || '-';
             cell.style = style
          }
       }