增加发券规则

app/Admin/Controllers/Activity/IndexController.php

@@ -204,7 +204,7 @@ class IndexController extends AdminController
             if ($request->total < 0) {
                 $error = new MessageBag([
                     'title'   => '错误',
-                    'message' => '可发券总数必须大于0',
+                    'message' => '可发券总数必须大于0.',
                 ]);
 
                 return back()->withInput()->with(compact('error'));

app/Models/Activity.php

@@ -100,7 +100,7 @@ class Activity extends Model
     {
 
         try {
-            $code = 'YSD' . date('ymd') . mt_rand(100000, 999999);
+            $code = '66406' . date('ymd') . mt_rand(100000, 999999);
 
             if ($this->type == SELF::TYPE_EXTEND) {
                 $start_at = now();