使用JavaScript实现轮播图效果
本文实例为大家分享了JavaScript实现轮播图效果的具体代码,供大家参考,具体内容如下
纯js,不使用轮播图控件怎么做轮播图呢,往下看吧
效果图:
1.可点击小圆点切换图片
2.可点击左右按钮切换图片
3.可自动播放
先上CSS和HTML代码:
<body> <div class="main"> <div class="focus fl"> <a href="javascript:;" class="arrow-l"><</a> <a href="javascript:;" class="arrow-r"> > </a> <ul> <li> <a href="#" ><img src="../02/15轮播图制作/upload/focus.jpg" alt=""></a> </li> <li> <a href="#" ><img src="../02/15轮播图制作/upload/focus1.jpg" alt=""></a> </li> <li> <a href="#" ><img src="../02/15轮播图制作/upload/focus2.jpg" alt=""></a> </li> <li> <a href="#" ><img src="../02/15轮播图制作/upload/focus3.jpg" alt=""></a> </li> </ul> <ol class="circle"> </ol> </div> </div> </body>
<style> * { padding: 0; margin: 0; } a { text-decoration: none; } ol { list-style: none; } .main { width: 980px; height: 455px; margin-left: 440px; margin-top: 10px; } .focus { position: relative; width: 721px; height: 455px; background-color: purple; overflow: hidden; } .focus ul { position: absolute; top: 0; left: 0; width: 600%; } .focus ul li { float: left; list-style: none; } .arrow-l, .arrow-r { display: none; position: absolute; top: 50%; margin-top: -20px; width: 24px; height: 40px; background: rgba(0, 0, 0, .3); text-align: center; line-height: 40px; color: #fff; font-family: 'icomoon'; font-size: 18px; z-index: 2; } .arrow-r { right: 0; } .circle { position: absolute; bottom: 10px; left: 50px; } .circle li { float: left; width: 8px; height: 8px; /*background-color: #fff;*/ border: 2px solid rgba(255, 255, 255, 0.5); margin: 0 3px; border-radius: 50%; /*鼠标经过显示小手*/ cursor: pointer; } .current { background-color: #fff; } </style>
最后就是JS代码部分了
window.addEventListener('load', function() { // 获取要使用到的元素 var arrow_l = document.querySelector('.arrow-l'); var arrow_r = document.querySelector('.arrow-r'); var focus = document.querySelector('.focus'); var focusWidth = focus.offsetWidth; //鼠标移动到图片上,显示左右切换的按钮 focus.addEventListener('mouseenter', function() { arrow_l.style.display = 'block'; arrow_r.style.display = 'block'; //清除定时器,不再自动播放 clearInterval(timer); timer = null; //清除定时器变量 }); //鼠标离开,左右切换按钮隐藏 focus.addEventListener('mouseleave', function() { arrow_l.style.display = 'none'; arrow_r.style.display = 'none'; timer = setInterval(function() { arrow_r.click(); }, 2000) }); var ul = focus.querySelector('ul'); var ol = focus.querySelector('.circle'); console.log(ol); for (var i = 0; i < ul.children.length; i++) { var li = document.createElement('li'); //创建自定义属性index li.setAttribute('index', i); //根据li(图片)的个数自动添加左下角的小圆点 ol.appendChild(li); li.addEventListener('click', function() { for (var i = 0; i < ol.children.length; i++) { ol.children[i].className = ''; } this.className = 'current'; var index = this.getAttribute('index'); num = index; circle = index; animate(ul, -index * focusWidth); }) } ol.children[0].className = 'current'; var first = ul.children[0].cloneNode(true); ul.appendChild(first); var num = 0; var circle = 0; var flag = true; //点击'>'进行图片向右切换 arrow_r.addEventListener('click', function() { if (num == ul.children.length - 1) { ul.style.left = 0; num = 0; } num++; animate(ul, -num * focusWidth); circle++; if (circle == ol.children.length) { circle = 0; } circleChange(); }); //点击'<'进行图片向左切换 arrow_l.addEventListener('click', function() { if (num == 0) { num = ul.children.length - 1; ul.style.left = -num * focusWidth + 'px'; } num--; animate(ul, -num * focusWidth); circle--; circle = circle < 0 ? ol.children.length - 1 : circle; circleChange() }); //清除样式函数,排他思想 function circleChange() { for (var i = 0; i < ol.children.length; i++) { ol.children[i].className = ''; } ol.children[circle].className = 'current'; } //定时器+click()实现自动播放 var timer = setInterval(function() { arrow_r.click(); }, 2000) })
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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