导出时，无法生成Excel

src/views/sensitive-control/data-view-message.vue

@@ -531,8 +531,11 @@
       },
       downloadFile(base64, fileName) {
         let a = document.createElement('a');
-        let uploadHref = 'data:application/xls;base64,' + base64;
+        let uploadHref = 'data:application/xlsx;base64,' + base64;
         a.setAttribute('href', uploadHref);
+        if (fileName == null || fileName == '') {
+            fileName = '数据.xlsx';
+        }
         let exportFileName = fileName;
         a.setAttribute('download', exportFileName);
         a.click();