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轮播效果

news 来源：原创 2024/5/3 9:17:31

Js实现：

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
      * {
            margin: 0;
            padding: 0;
            text-decoration: none;
        }
        
        body {
            padding: 20px;
        }
        
        .container {
            position: relative;
            width: 600px;
            height: 400px;
            border: 3px solid #333;
            overflow: hidden;
        }
        
        .list {
            position: absolute;
            z-index: 1;
            width: 4200px;
            height: 400px;
           
        }
        
        .list img {
            float: left;
            width: 600px;
            height: 400px;
        }
        
        .buttons {
            position: absolute;
            left: 250px;
            bottom: 20px;
            z-index: 2;
            height: 10px;
            width: 100px;
        }
        
        .buttons span {
            float: left;
            margin-right: 5px;
            width: 10px;
            height: 10px;
            border: 1px solid #fff;
            border-radius: 50%;
            background: #333;
            cursor: pointer;
        }
        
        .buttons .on {
            background: orangered;
        }
        
        .arrow {
            position: absolute;
            top: 180px;
            z-index: 2;
            display: none;
            width: 40px;
            height: 40px;
            font-size: 36px;
            font-weight: bold;
            line-height: 39px;
            text-align: center;
            color: #fff;
            background-color: RGBA(0, 0, 0, .3);
            cursor: pointer;
        }
        
        .arrow:hover {
            background-color: RGBA(0, 0, 0, .7);
        }
        
        .container:hover .arrow {
            display: block;
        }
        
        .prev {
            left: 20px;
        }
        
        .next {
            right: 20px;
        }
        
     
       
    </style>
</head>

<body>

    <div class="container">
        <div class="list" style="left: -600px;">
            <img src="images/img_5.jpg" class="img-active-enter" alt="1" />
            <img src="images/img_1.jpg" alt="1" />
            <img src="images/img_2.jpg" alt="2" />
            <img class="img-active-leave" src="images/img_3.jpg" alt="3" />
            <img src="images/img_4.jpg" alt="4" />
            <img src="images/img_5.jpg" alt="5" />
            <img src="images/img_1.jpg" alt="5" />
        </div>
        <div class="buttons">
            <span index="1" class="on"></span>
            <span index="2"></span>
            <span index="3"></span>
            <span index="4"></span>
            <span index="5"></span>
        </div>
        <a href="javascript:;" class="prev arrow">&lt;</a>
        <a href="javascript:;" class="next arrow">&gt;</a>
    </div>
   
    
    <script type="text/javascript">
       window.onload = function() {
          var container = document.getElementsByClassName('container')[0];
          var list = document.getElementsByClassName('list')[0];
          var prev = document.getElementsByClassName('prev')[0];
          var next = document.getElementsByClassName('next')[0];
          var buttons = document.getElementsByClassName('buttons')[0].getElementsByTagName('span');

          var index = 1;
          // 暂停标识
          var stopFlag = false;
          
          function buttonsShow() {
            for (var i=0; i< buttons.length; i++) {
              if (buttons[i].className === 'on') {
                buttons[i].className = '';
              }
            }
            buttons[index -1].className = 'on';
          }
          
          prev.onclick = function () {
           if (stopFlag) {
              return;
            }
            index -= 1; 
            if (index < 1) {
              index = 5
            }
            buttonsShow();
            animate(600)
          }
          
          next.onclick = function () {
            if (stopFlag) {
              return;
            }
            index += 1;
            if (index > 5) {
              index = 1
             }
             buttonsShow();
             animate(-600);
          }
          
          for (let i = 0; i< buttons.length; i++) {
            buttons[i].onclick = function () {
              var clickIndex = parseInt(this.getAttribute('index'));
              var offset = 600 * (index - clickIndex);
              animate(offset);
              index = clickIndex;
              buttonsShow();
            }
          }

          function animate(offset) {
              //获取的是style.left，是相对左边获取距离，所以第一张图后style.left都为负值，
              //且style.left获取的是字符串，需要用parseInt()取整转化为数字。
              var newLeft = parseInt(list.style.left) + offset;
               if(newLeft<-3000){
                  list.style.left = -3600 + 'px';
                  list.style.transition = 'left 1s';
                  stopFlag = true;
                  setTimeout(function(){
                    list.style.left= -600 + 'px'
                    list.style.transition='left 0s'; 
                    stopFlag = false;
                  },1000)
                  return;
               }
               if(newLeft>-600){
                   list.style.left = 0 + 'px';
                   list.style.transition = 'left 1s'
                   stopFlag = true;
                   setTimeout(function(){
                    list.style.left='-3000px'
                    list.style.transition='left 0s'; 
                    stopFlag = false;
                  },1000)
                   return;
               }
             
               list.style.left = newLeft + 'px';
               list.style.transition = 'left 1s'
          }
          
          // 创建定时器
          var timer;
          function play() {
            timer = setInterval(function () {
              next.onclick();
            }, 1500)
          }
          
          function stop() {
            clearInterval(timer)
          }
          play();
          
          container.onmouseover = stop;
          container.onmouseout = play;
        }
        
        
    </script>

</body>

</html>