fix

@@ -31,7 +31,7 @@
                     </li>
                     <li class="input-container-li clearfix">
                         <input name="refer" id="refer" type="hidden" value="http%3A%2F%2Fwww.yohobuy.com%2F">
-                        <input id="find-btn" class="btn find-btn" type="submit" value="下一步" disabled="">
+                        <input id="find-btn" class="btn find-btn" type="button" value="下一步">
                     </li>
                 </ul>
             </form>

@@ -189,7 +189,7 @@ Captcha.prototype = {
             result.push(this.$_____trojanYohobuy.val());
         }
 
-        return result.join('');
+        return result.join('') === '0000' ? '' : result.join('');
     },
 
     /**