增加二维码头部，添加通用判断

 'use strict';
 
 const model = require('../models/myqrcode'),
-      headerModel = require('../../../doraemon/models/header'); // 头部model
+    headerModel = require('../../../doraemon/models/header'); // 头部model
 
 exports.index = (req, res, next) => {
     let params = req.query;
@@ -21,4 +21,4 @@ exports.index = (req, res, next) => {
             })
         });
     }).catch(next);
-};
\ No newline at end of file
+};