edit

app/mshop/src/Buy.php

@@ -127,7 +127,7 @@ class Buy extends Core
                     $this->data['wallet']['price'] = round($this->data['price'],2);
                     $this->data['price'] = 0;
                     #余额
-                    $this->data['wallet']['yue'] = round($this->shop['price'] - $this->data['price'],2);
+                    $this->data['wallet']['yue'] = round($this->shop['price'] - $this->data['wallet']['price'],2);
                 } else {
                     $this->data['wallet']['type'] = 2;
                     $this->data['wallet']['price'] = $this->shop['price'];