diff --git a/application/api/controller/Redpacket.php b/application/api/controller/Redpacket.php
index 5df6159..e821a75 100644
--- a/application/api/controller/Redpacket.php
+++ b/application/api/controller/Redpacket.php
@@ -33,6 +33,7 @@ class Redpacket extends BaseCom
     public function grab()
     {
         $redpacketId = $this->request->post('redpacket_id');
+        $redpacketId = input('redpacket_id', 0);
 
         if (empty($redpacketId)) {
             return V(0, '红包ID不能为空');