swiper按钮点击无效及控制器无效问题

点击箭头图片切换的同时，下面小图标也会随着切换，同理下面小图标切换时，上面也随着滚动。

示例代码如下：

 <!-- Swiper -->
    <div class="swiper-container gallery-top">
        <div class="swiper-wrapper">
           <div class="swiper-slide" style="background-image:url(img/nature1.jpg)"></div>
            <div class="swiper-slide" style="background-image:url(img/nature2.jpg)"></div>
            <div class="swiper-slide" style="background-image:url(img/nature3.jpg)"></div>
            <div class="swiper-slide" style="background-image:url(img/nature4.jpg)"></div>
            <div class="swiper-slide" style="background-image:url(img/nature5.jpg)"></div>
        </div>
        <!-- Add Arrows -->
        <div class="swiper-button-next swiper-button-white"></div>
        <div class="swiper-button-prev swiper-button-white"></div>
    </div>
    <div class="swiper-container gallery-thumbs">
        <div class="swiper-wrapper">
            <div class="swiper-slide" style="background-image:url(img/nature1.jpg)"></div>
            <div class="swiper-slide" style="background-image:url(img/nature2.jpg)"></div>
            <div class="swiper-slide" style="background-image:url(img/nature3.jpg)"></div>
            <div class="swiper-slide" style="background-image:url(img/nature4.jpg)"></div>
            <div class="swiper-slide" style="background-image:url(img/nature5.jpg)"></div>
        </div>
    </div>

    <!-- Swiper JS -->
    <script src="../dist/js/swiper.min.js"></script>

    <!-- Initialize Swiper -->
    <script>
    var galleryTop = new Swiper('.gallery-top', {
        nextButton: '.swiper-button-next',
        prevButton: '.swiper-button-prev',
  //改为：

navigation: {
          nextEl: '.swiper-button-next',
          prevEl: '.swiper-button-prev',
         },

        spaceBetween: 10,
    });
    var galleryThumbs = new Swiper('.gallery-thumbs', {
        spaceBetween: 10,
        centeredSlides: true,
        slidesPerView: 'auto',
        touchRatio: 0.2,
        slideToClickedSlide: true
    });
    galleryTop.params.control = galleryThumbs; //改为controller
    galleryThumbs.params.control = galleryTop;//改为controller

    </script>

但是，在使用时，点击箭头或者下面小图标确无效。

修改了以上红色地方后，就生效了。