原生js实现轮播图特效
轮播图也称为焦点图,是网页中比较常见的网页特效。
功能需求:
1.鼠标经过轮播图模块,左右按钮显示,离开隐藏左右按钮。
2.点击右侧按钮一次,图片往左播放一张,以此类推,左侧按钮同理。
3.图片播放的同时,下面小圆圈模块跟随一起变化。
4.点击小圆圈,可以播放相应图片。
5.鼠标不经过轮播图,轮播图也会自动播放图片。
6.鼠标经过,轮播图模块, 自动播放停止。
此文章的代码为一个完整的轮播图的实现代码,复制即可运行
实现效果由于大小问题无法上传,可自行观看淘宝或京东首页轮播图效果
html文件:
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <meta name='viewport' content='width=device-width, initial-scale=1.0'> <title>Document</title> <link rel='stylesheet' href='https://www.haobala.com/bcjs/css/index.css' rel='external nofollow' > <script src='https://www.haobala.com/bcjs/js/animate.js'></script> <script src='https://www.haobala.com/bcjs/js/index.js'></script></head><body> <div class='box'> <ul> <li><img src='https://www.haobala.com/bcjs/img/focus.jpg' alt=''></li> <li><img src='https://www.haobala.com/bcjs/img/focus1.jpg' alt=''></li> <li><img src='https://www.haobala.com/bcjs/img/focus2.jpg' alt=''></li> <li><img src='https://www.haobala.com/bcjs/img/focus3.jpg' alt=''></li> </ul> <ol> </ol> <div class='arr-l'> < </div> <div class='arr-r'> > </div> </div></body></html>
css文件:
* { margin: 0; padding: 0; outline: none;}.box { overflow: hidden; position: relative; height: 455px; width: 721px; background-color: pink; margin: 50px auto;}.box ul { position: absolute; top: 0; left: 0; width: 600%;}.box ul li { list-style: none; float: left;}.box ol { position: absolute; bottom: 10px; left: 100px; background-color: rgba(255, 255, 255, .3); border-radius: 8px; list-style: none; height: 10px; padding: 2px 5px;}.box ol li { cursor: pointer; float: left; height: 8px; width: 8px; border: 1px solid #fff; border-radius: 50%; margin: 0 5px;}.arr-l,.arr-r { display: none; color: #fff; cursor: pointer; position: absolute; height: 40px; width: 30px; background-color: rgba(0, 0, 0, .3); line-height: 40px; text-align: center;}.arr-l { top: 50%; left: 0; transform: translateY(-50%);}.arr-r { right: 0; top: 50%; transform: translateY(-50%);}.current { background-color: #fff;}
动画实现js文件animate.js:
function animate(obj, target, callback) { clearInterval(obj.timer); obj.timer = setInterval(function () { if (target - obj.offsetLeft > 0) { var step = Math.ceil((target - obj.offsetLeft) / 10); } else { var step = Math.floor((target - obj.offsetLeft) / 10); } if (obj.offsetLeft == target) { clearInterval(obj.timer); callback && callback(); } obj.style.left = obj.offsetLeft + step + ’px’; }, 15)}
index.js:
window.addEventListener(’load’, function () { var arrl = this.document.querySelector(’.arr-l’); var arrr = this.document.querySelector(’.arr-r’); var box = this.document.querySelector(’.box’); var boxWidth = box.offsetWidth; box.addEventListener(’mouseenter’, function () { arrl.style.display = ’block’; arrr.style.display = ’block’; clearInterval(timer); timer = null; }) box.addEventListener(’mouseleave’, function () { arrl.style.display = ’none’; arrr.style.display = ’none’; timer = setInterval(function () { arrr.click(); }, 2000); }); var ul = box.querySelector(’ul’); var ol = box.querySelector(’ol’); for (var i = 0; i < ul.children.length; i++) { var li = document.createElement(’li’); li.setAttribute(’data-index’, i); ol.appendChild(li); ol.children[0].className = ’current’; li.addEventListener(’click’, function () { for (var i = 0; i < ol.children.length; i++) { ol.children[i].className = ’’; } this.className = ’current’; var dateindex = this.getAttribute(’data-index’); num = dateindex; circle = dateindex; animate(ul, -dateindex * boxWidth); }); } var first = ul.children[0].cloneNode(true); ul.appendChild(first); var num = 0; var circle = 0; var flag = true; arrr.addEventListener(’click’, function () { if (flag) { flag = false; if (num == ul.children.length - 1) { ul.style.left = 0; num = 0; } num++; animate(ul, -num * boxWidth, function () { flag = true; }); circle++; if (circle == ol.children.length) { circle = 0; } circleChange(); } }); arrl.addEventListener(’click’, function () { if (flag) { flag = false; if (num == 0) { num = ul.children.length - 1; ul.style.left = -num * boxWidth + ’px’; } num--; animate(ul, -num * boxWidth, function () { flag = true; }); circle--; if (circle < 0) { circle = ol.children.length - 1; } circleChange(); } }); function circleChange() { for (var i = 0; i < ol.children.length; i++) { ol.children[i].className = ’’; } ol.children[circle].className = ’current’; } var timer = setInterval(function () { arrr.click(); }, 2000);})
注意事项
引用两个js文件时,animate.js要在index.js之前引用,因为index.js中要用到animate.js里的函数。
精彩专题分享:jQuery图片轮播 JavaScript图片轮播 Bootstrap图片轮播
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好吧啦网。
相关文章: