首页金额统计修改

@@ -140,7 +140,7 @@ class User extends Api
         $total_money = 0;
         foreach ($plus as $v) {
             if($v['before'] > $v['after']) {
-                $total_money = bcmul($total_money,$v['money'],2);
+                $total_money = bcsub($total_money,$v['money'],2);
             } else {
                 $total_money = bcadd($total_money,$v['money'],2);
             }