bind captha

 {
   "name": "yohobuy-node",
-  "version": "5.6.6",
+  "version": "5.6.7",
   "private": true,
   "description": "A New Yohobuy Project With Express",
   "repository": {

@@ -19,7 +19,7 @@ var $wrapper = $('.bindwrapper'),
     $nextBtn = $wrapper.find('.yohobindbtn');
 
 var captcha = new Captcha('#captcha').init();
-var captcha2 = new Captcha('#captcha2').init();
+var captcha2;
 
 require('../../simple-header');
 
@@ -356,6 +356,7 @@ function nextStep() {
                     $('#bindmobileform').attr('action', data.data.next);
                     $('#bindmobileform').submit();
                 } else if (data.code === 201) {
+                    captcha2 = new Captcha('#captcha2').init();
 
                     // 已注册 未绑定
                     username = data.data.user.username;