移动端上下滑动swiper,第二个页面内容大于屏幕尺寸，现在的问题是，超出部分无法通过滚动条下滑查看。

相关链接：

https://segmentfault.com/q/1010000005605451

上下滑动的swiper，有两页，第二个slider是列表页，内容会超出屏幕高度，现在的问题是，超出部分无法通过滚动条下滑查看。

想要的效果是，第二页slider不受影响，出现滚动，正常下滑查看内容。

（如果禁用swiper某个方向的移动，会导致无法滑动到上一页）



<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1">
        <link rel="stylesheet" type="text/css" href="css/index.css"/>
        <!--swiper-->
        <link rel="stylesheet" href="css/swiper-3.4.2.min.css">   
    </head>
    <body>
        <div class="swiper-container swiper-container-v">
            <div class="swiper-wrapper">
                <div class="swiper-slide">Vertical Slide 1</div>
                <div class="swiper-slide second">
                    <div class="swiper-container swiper-container-scrollbar">
                        <div class="swiper-wrapper">
                             <div class="swiper-slide">
                                <h3>title</h3>
                                <p>this is a p tag</p>
                                  .....
                                  .....
                                  .....
                            </div>
                        </div>
                    <div class="swiper-scrollbar"></div>
                </div>
            </div>
            <div class="swiper-slide">Vertical Slide 3</div>
            <div class="swiper-slide">Vertical Slide 4</div>
        </div>
    </div>
       <script src="js/swiper-3.4.2.min.js"></script>
       <script>        
            
           var swiperV = new Swiper('.swiper-container-v', {
             direction: 'vertical'
            });

           var swiperScrollbar = new Swiper('.swiper-container-scrollbar', {
             scrollbar: '.swiper-container-scrollbar .swiper-scrollbar',
             direction: 'vertical',
             slidesPerView: 'auto',
             mousewheelControl: true,
             freeMode: true,
             nested: true
            });
      </script>
       
    </body>
</html>