js实现简单轮播图效果
本文实例为大家分享了js实现简单轮播图效果的具体代码,供大家参考,具体内容如下
使用transform = translateX()实现的图片切换
<style> .box { position: relative; overflow: hidden; margin: 200px auto; width: 600px; height: 400px; } .img { width: 3000px; height: 400px; } img { float: left; width: 600px; height: 400px; } .btn { position: absolute; top: 350px; left: 245px; width: 110px; height: 20px; } .dian { float: left; margin: 5px; width: 12px; height: 12px; border-radius: 50%; background-color: rgba(255, 255, 255, 0.3); cursor: pointer; } .left, .right { display: none; box-sizing: border-box; position: absolute; top: 150px; width: 50px; height: 100px; background-color: rgba(0, 0, 0, 0.521); font-size: 40px; line-height: 100px; color: #fff; } .box:hover .left, .box:hover .right { display: block; } .left { padding-left: 10px; left: 0; } .right { padding-right: 10px; text-align: right; right: 0; } </style>
<div class="box"> <div class="img"> <img src="./img/1.jpeg" alt=""> <img src="./img/2.jpeg" alt=""> <img src="./img/3.jpeg" alt=""> <img src="./img/4.jpeg" alt=""> <img src="./img/5.jpeg" alt=""> </div> <div class="btn"> <span class="dian"></span> <span class="dian"></span> <span class="dian"></span> <span class="dian"></span> <span class="dian"></span> </div> <div class="left">< </div> <div class="right">></div> </div>
<script> var btn = document.getElementsByClassName('btn')[0]; var imgBox = document.getElementsByClassName('img')[0]; var imgs = imgBox.getElementsByTagName('img'); var btnChild = document.getElementsByClassName('dian'); var k = 0; // 向按钮添加自定义属性 for (var i = 0; i < btnChild.length; i++) { btnChild[i].dataset.num = i * 600; } // 默认为 第一张图片,第一个按钮为白色 btnChild[0].style.background = 'rgba(255, 255, 255, 0.8)'; // 点击按钮切换图片,按钮变色 btn.onclick = function(e) { if (e.target.nodeName === 'SPAN') { // 先让所有按钮为默认颜色 for (var i = 0; i < btnChild.length; i++) { btnChild[i].style.background = 'rgba(255, 255, 255, 0.4)'; } // 点击的按钮变色 k = +e.target.dataset.num; console.log(k); btnChild[k / 600].style.background = 'rgba(255, 255, 255, 0.8)'; // 切换图片 imgBox.style.transform = `translateX(-${e.target.dataset.num}px)`; } } // 获取图片长度 // var imgWidth = +getComputedStyle(imgs[0]).width.slice(0, -2); var imgWidth = imgs[0].offsetWidth; // 定时器 移动图片 var interval1 = setInterval(move, 1000); var interval; // 函数 移动图片,改变按钮 function move() { k += imgWidth; if (k === imgWidth * imgs.length) { k = 0; } // 移动图片 imgBox.style.transform = `translateX(-${k}px)`; // 改变按钮颜色 for (var i = 0; i < btnChild.length; i++) { btnChild[i].style.background = 'rgba(255, 255, 255, 0.4)'; } btnChild[k / 600].style.background = 'rgba(255, 255, 255, 0.8)'; } // 鼠标移动到图片上 删除定时器 var box = document.getElementsByClassName('box')[0]; box.onmouseover = function() { clearInterval(interval1); clearInterval(interval); } // 鼠标移出 启动定时器 box.onmouseout = function() { interval = setInterval(move, 1000); } var leftBtn = document.getElementsByClassName('left')[0]; var rightBtn = document.getElementsByClassName('right')[0]; rightBtn.onclick = function() { k += imgWidth; if (k === imgWidth * imgs.length) { k = 0; } // 移动图片 imgBox.style.transform = `translateX(-${k}px)`; // 改变按钮颜色 for (var i = 0; i < btnChild.length; i++) { btnChild[i].style.background = 'rgba(255, 255, 255, 0.4)'; } btnChild[k / 600].style.background = 'rgba(255, 255, 255, 0.8)'; } leftBtn.onclick = function() { k -= imgWidth; if (k < 0) { k = imgWidth * (imgs.length - 1); } imgBox.style.transform = `translateX(-${k}px)`; // 改变按钮颜色 for (var i = 0; i < btnChild.length; i++) { btnChild[i].style.background = 'rgba(255, 255, 255, 0.4)'; } btnChild[k / 600].style.background = 'rgba(255, 255, 255, 0.8)'; } </script>
效果图:
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