edit

assets/lib/excel/excel.js

@@ -3,7 +3,7 @@ var Excel =
 {
     open : function(data, filename, sheetname) {
         this.name = sheetname || 'sheet1';
-        this.sheet = XLSX.utils.aoa_to_sheet(data);
+        this.sheet = XLSX.utils.aoa_to_sheet(data, {raw: true});
         if (filename.substr(-5).toLowerCase() !== '.xlsx') {
             filename += '.xlsx';
         }