修改用电量小数计算错误

application/em/model/Useage.php

@@ -52,7 +52,7 @@ class Useage extends Base
             ->toarray();
 
         foreach ($data as $k => $v){
-            $data[$k]['repo_numb'] = $v.current_sum_numb - $v.last_sum_numb;
+            $data[$k]['repo_numb'] = $v['current_sum_numb'] - $v['last_sum_numb'];
         }
         return $data;
     }