jQuery实现查看图片功能

<!-- 放缩略图的div -->
  <div class="sl">
    <img src="images/1.jpg" />
    <img src="images/2.jpg" />
    <img src="images/3.jpg" />
  </div>
  <!-- 实现关灯的div -->
  <div class="gd"></div>
  <div class="yt">
    <!-- 左翻按钮 -->
    <div class="left">
      <img src="images/left.png" alt="" width="100">
    </div>
    <div class="tp">
      <!-- 展示原图 -->
      <img src="images/1.jpg" class="show" />
      <!--放开始和结束图片的盒子 -->
       <div class="ss" style="display: none;">
        <img src="images/start.png" alt="" width="50" class="start">
      </div>
    </div>
    <!-- 右翻按钮 -->
    <div class="right">
      <img src="images/right.png" alt="" width="100">
    </div>
</div>

 html,body{
    padding: 0;
    margin: 0;
  }
  .sl img {
    width: 300px;
  }

  .gd {
    background-color: rgba(0, 0, 0, 0.7);
    position: absolute;
    z-index: 900;
    display: none;
    top: 0;
    left: 0;
  }

  .sl {
    position: absolute;
    z-index: 888;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
  }

  .sl>img {
    width: 25%;
  }

  .yt {
    z-index: 990;
    position: absolute;
    display: none;
    left: 500px;
    top: 200px;
  }

  .tp {
    margin: 0 20px;
  }

  .yt>div {
    display: inline-block;
  }

  .left,
  .right {
    position: relative;
    top: -110px;
    cursor: pointer;
  }

  .ss {
    position: relative;
    width: 50px;
    height: 50px;
    left: 270px;
  }

  .start {
    z-index: 990;
    position: absolute;
  }

var max = $(".sl img").length;
$(function (e) {
  var width = $(window).width();
  var height = $(window).height();
  $(".gd").css({
    "height": height,
    "width": width
  });

  //左翻按钮动画
  $(".left").hover(
    function () {
      $(this).animate({
        "left": "-10"
      });
    },
    function () {
      $(this).animate({
        "left": "0"
      });
    }
  );
  //右翻按钮动画
  $(".right").hover(
    function () {
      $(this).animate({
        "right": "-10"
      });
    },
    function () {
      $(this).animate({
        "right": "0"
      });
    }
  );

  //被点击的缩略图
  $(".sl>img").click(function (e) {
    $(".gd").show(500);
    $(".yt").fadeIn(800);
    var index = $(this).index(); //当前被点击图片的索引
    $(".tp>img").attr("src", "images/" + (index + 1) + ".jpg");
    //左翻
    $(".left").click(function (e) {
      if (index - 1 < 0) {
        index = max - 1;
      } else {
        index = index - 1;
      }
      $(".tp>img").attr("src", "images/" + (index + 1) + ".jpg");
    });
    //右翻
    $(".right").click(function (e) {
      if (index == max - 1) {
        index = 0;
      } else {
        index = index + 1;
      }
      $(".tp>img").attr("src", "images/" + (index + 1) + ".jpg");
    });

    //隐藏和显示播放按钮
    $(".tp").hover(
      function () {
        $(".ss").fadeIn(500);
        $(this).animate({
          "opacity": "0.7"
        }, 700);
      },
      function () {
        $(".ss").fadeOut(500);
        $(this).animate({
          "opacity": "1"
        }, 700);
      }
    );
 //点击开始播放 再次点击结束播放
    let flag = true;
    $(".start").click(function () {
      if (flag == true) {
        time = setInterval(function () {
          if (index == max - 1) {
            index = 0;
          } else {
            index = index + 1;
          }
          $(".tp>img").attr("src", "images/" + (index + 1) + ".jpg");
        }, 2000);
        flag = false;
        $(".start").attr("src", "images/stop.png");
      } else {
        clearInterval(time);
        flag = true;
        $(".start").attr("src", "images/start.png");
      }
    });
    let h = $(".tp>img").height();
    $(".ss").css({
      "top": -h / 2 - 25
    });
    //隐藏关灯效果
    $(".gd").click(function () {
      $(".gd").hide(800);
      $(".yt").fadeOut(500);
    });
  });
});