jQuery轮播图7张图 带切换按钮 带预览小图 小图只显示前后五张 通过URL访问指定图片

以下是一个基于jQuery实现的轮播图，包括7张图片、切换按钮和预览小图，小图只显示前后五张。同时，可以通过URL访问指定图片。

HTML代码：

<div class="slider">
  <div class="slider-main">
    <ul class="slider-list">
      <li><img src="image1.jpg" alt="Image 1"></li>
      <li><img src="image2.jpg" alt="Image 2"></li>
      <li><img src="image3.jpg" alt="Image 3"></li>
      <li><img src="image4.jpg" alt="Image 4"></li>
      <li><img src="image5.jpg" alt="Image 5"></li>
      <li><img src="image6.jpg" alt="Image 6"></li>
      <li><img src="image7.jpg" alt="Image 7"></li>
    </ul>
  </div>
  <div class="slider-prev"><i class="fa fa-angle-left"></i></div>
  <div class="slider-next"><i class="fa fa-angle-right"></i></div>
  <div class="slider-preview">
    <div class="preview-list">
      <ul>
        <li><a href="?img=1"><img src="image1.jpg" alt="Image 1"></a></li>
        <li><a href="?img=2"><img src="image2.jpg" alt="Image 2"></a></li>
        <li><a href="?img=3"><img src="image3.jpg" alt="Image 3"></a></li>
        <li><a href="?img=4"><img src="image4.jpg" alt="Image 4"></a></li>
        <li><a href="?img=5"><img src="image5.jpg" alt="Image 5"></a></li>
        <li><a href="?img=6"><img src="image6.jpg" alt="Image 6"></a></li>
        <li><a href="?img=7"><img src="image7.jpg" alt="Image 7"></a></li>
      </ul>
    </div>
    <div class="preview-prev"><i class="fa fa-angle-left"></i></div>
    <div class="preview-next"><i class="fa fa-angle-right"></i></div>
  </div>
</div>

CSS代码：

.slider {
  position: relative;
  overflow: hidden;
  width: 800px;
  height: 500px;
}
.slider-main {
  position: absolute;
  top: 0;
  left: 0;
  width: 700%;
  height: 100%;
}
.slider-list {
  position: relative;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}
.slider-list li {
  position: relative;
  float: left;
  width: 14.2857%;
  height: 100%;
}
.slider-list li img {
  display: block;
  width: 100%;
  height: 100%;
}
.slider-prev,
.slider-next {
  position: absolute;
  top: 50%;
  z-index: 1;
  width: 50px;
  height: 50px;
  margin-top: -25px;
  background-color: rgba(0, 0, 0, 0.5);
  color: #fff;
  text-align: center;
  line-height: 50px;
  cursor: pointer;
}
.slider-prev {
  left: 0;
}
.slider-next {
  right: 0;
}
.slider-preview {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background-color: rgba(0, 0, 0, 0.5);
}
.preview-list {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.preview-list ul {
  position: absolute;
  top: 0;
  left: 0;
  width: 700%;
  height: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
  transition: transform 0.5s ease;
}
.preview-list li {
  position: relative;
  float: left;
  width: 14.2857%;
  height: 100%;
}
.preview-list li a {
  display: block;
  width: 100%;
  height: 100%;
}
.preview-list li img {
  display: block;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  transition: opacity 0.5s ease;
}
.preview-list li.active img {
  opacity: 1;
}
.preview-prev,
.preview-next {
  position: absolute;
  top: 50%;
  z-index: 1;
  width: 50px;
  height: 50px;
  margin-top: -25px;
  background-color: rgba(0, 0, 0, 0.5);
  color: #fff;
  text-align: center;
  line-height: 50px;
  cursor: pointer;
}
.preview-prev {
  left: 0;
}
.preview-next {
  right: 0;
}

JavaScript代码：

$(function() {
  var $slider = $('.slider'),
      $sliderMain = $('.slider-main'),
      $sliderList = $('.slider-list'),
      $sliderItem = $('.slider-list li'),
      $sliderPrev = $('.slider-prev'),
      $sliderNext = $('.slider-next'),
      $previewList = $('.preview-list ul'),
      $previewItem = $('.preview-list li'),
      $previewPrev = $('.preview-prev'),
      $previewNext = $('.preview-next'),
      total = $sliderItem.length,
      current = 0,
      interval = null;
  
  // 初始化
  $sliderItem.eq(current).addClass('active');
  $previewItem.eq(current).addClass('active');
  $previewList.css('transform', 'translateX(-' + (current * 14.2857) + '%)');
  
  // 切换到指定图片
  var img = parseInt(getParameterByName('img'));
  if (img && img > 0 && img <= total) {
    current = img - 1;
    changeSlide();
  }
  
  // 切换到下一张图片
  function nextSlide() {
    current++;
    if (current >= total) {
      current = 0;
    }
    changeSlide();
  }
  
  // 切换到上一张图片
  function prevSlide() {
    current--;
    if (current < 0) {
      current = total - 1;
    }
    changeSlide();
  }
  
  // 切换到指定图片
  function gotoSlide(index) {
    current = index;
    changeSlide();
  }
  
  // 切换图片
  function changeSlide() {
    $sliderList.stop().animate({ 'left': '-' + (current * 100) + '%' }, 500);
    $sliderItem.eq(current).addClass('active').siblings().removeClass('active');
    $previewItem.eq(current).addClass('active').siblings().removeClass('active');
    if (current >= 5 && current < total - 2) {
      $previewList.stop().animate({ 'transform': 'translateX(-' + ((current - 4) * 14.2857) + '%)' }, 500);
    } else if (current >= total - 2) {
      $previewList.stop().animate({ 'transform': 'translateX(-' + ((total - 9) * 14.2857) + '%)' }, 500);
    } else {
      $previewList.stop().animate({ 'transform': 'translateX(0)' }, 500);
    }
  }
  
  // 自动轮播
  interval = setInterval(nextSlide, 5000);
  
  // 鼠标悬停停止自动轮播
  $slider.on('mouseover', function() {
    clearInterval(interval);
  }).on('mouseout', function() {
    interval = setInterval(nextSlide, 5000);
  });
  
  // 点击切换按钮切换图片
  $sliderPrev.on('click', function() {
    prevSlide();
  });
  $sliderNext.on('click', function() {
    nextSlide();
  });
  
  // 点击预览小图切换图片
  $previewItem.on('click', function() {
    var index = $(this).index();
    gotoSlide(index);
  });
  
  // 点击预览小图切换按钮切换预览小图
  $previewPrev.on('click', function() {
    if (current > 0) {
      current--;
      $previewList.stop().animate({ 'transform': 'translateX(-' + (current * 14.2857) + '%)' }, 500);
    }
  });
  $previewNext.on('click', function() {
    if (current < total - 1) {
      current++;
      if (current >= 5 && current < total - 2) {
        $previewList.stop().animate({ 'transform': 'translateX(-' + ((current - 4) * 14.2857) + '%)' }, 500);
      } else if (current >= total - 2) {
        $previewList.stop().animate({ 'transform': 'translateX(-' + ((total - 9) * 14.2857) + '%)' }, 500);
      }
    }
  });
  
  // 获取URL参数
  function getParameterByName(name) {
    var url = window.location.href;
    name = name.replace(/[\[\]]/g, '\\$&');
    var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)'),
        results = regex.exec(url);
    if (!results) {
      return null;
    }
    if (!results[2]) {
      return '';
    }
    return decodeURIComponent(results[2].replace(/\+/g, ' '));
  }
});

注意事项：

1. 根据实际图片路径修改HTML代码中的图片路径；
2. 如果需要使用字体图标作为切换按钮，需要引入Font Awesome字体库；
3. 代码中使用了ES6语法，需要使用支持ES6的浏览器或者使用Babel进行转换。