Create CommonController.class.php

Application/Home/Controller/CommonController.class.php

@@ -7,6 +7,7 @@ class CommonController extends BaseController {
     //保存
     public function qrcode(){
         Vendor('Phpqrcode.phpqrcode');
+        $url = I("url");
         $url = urldecode($url) ? urldecode($url) : $url;
         $size = I("size") ? I("size") : 6;
         $object = new \QRcode();