JavaScript實(shí)現(xiàn)輪播圖效果
要求：
鼠標(biāo)經(jīng)過(guò)輪播圖模塊，左右按鈕顯示，離開(kāi)隱藏左右按鈕 點(diǎn)擊右側(cè)按鈕一次，圖片往左播放一張，以此類推，左側(cè)按鈕同理 圖片播放的同時(shí)，下面小圓圈模塊跟隨一起變化 點(diǎn)擊小圓圈，可以播放相應(yīng)圖片 鼠標(biāo)不經(jīng)過(guò)輪播圖，輪播圖也會(huì)自動(dòng)播放圖片 鼠標(biāo)經(jīng)過(guò)，輪播圖模塊，自動(dòng)播放停止代碼實(shí)現(xiàn)：
autoPlay.html（復(fù)制并保存為html文件，打開(kāi)即可見(jiàn)效果）：
<!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' rel='external nofollow' > <script src='https://blog-static.cnblogs.com/files/jacklzx/animate.js'></script> <script src='https://blog-static.cnblogs.com/files/jacklzx/autoPlay.js'></script></head><body> <div class='focus'> <!-- 左側(cè)按鈕 --> <a href='javascript:;' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' class='arrow-l'><</a> <!-- 右側(cè)按鈕 --> <a href='javascript:;' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' class='arrow-r'>></a> <!-- 滾動(dòng)區(qū)域 --> <ul> <li><a href='javascript:;' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' ><img src='https://s1.ax1x.com/2020/10/12/0W1wlt.jpg' alt=''></a> </li> <li><a href='javascript:;' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' ><img src='https://s1.ax1x.com/2020/10/12/0W3nHS.jpg' alt=''></a> </li> <li><a href='javascript:;' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' ><img src='https://s1.ax1x.com/2020/10/12/0Wtrmq.jpg' alt=''></a> </li> <li><a href='javascript:;' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' rel='external nofollow' ><img src='https://s1.ax1x.com/2020/10/12/0W1NYd.jpg' alt=''></a> </li> </ul> <!-- 小圓圈 --> <ol class='circle'> </ol> </div></body></html>
autoPlay.css：
li { list-style: none;}a { text-decoration: none;}* { margin: 0; padding: 0;}body { background-color: #00e1ff;}.focus { overflow: hidden; position: relative; width: 721px; height: 455px; margin: 100px auto; box-shadow: 10px 10px 20px rgba(0, 0, 0, 0.6); border-radius: 40px;}.focus ul { position: absolute; top: 0; left: 0; width: 600%;}.focus ul li { float: left;}.arrow-l { display: none; position: absolute; top: 50%; left: -12px; margin-top: -20px; width: 40px; height: 40px; background: rgba(0, 0, 0, .3); text-align: center; line-height: 40px; color: #fff; font-size: 18px; border-radius: 0 50% 50% 0; z-index: 999;}.arrow-r { display: none; position: absolute; top: 50%; right: -12px; margin-top: -20px; width: 40px; height: 40px; background: rgba(0, 0, 0, .3); text-align: center; line-height: 40px; color: #fff; font-size: 18px; border-radius: 50% 0 0 50%; z-index: 999;}.circle { position: absolute; bottom: 10px; left: 50%; transform: translateX(-50%);}.circle li { float: left; width: 12px; height: 12px; border: 2px solid rgba(255, 255, 255, .5); margin: 0 4px; border-radius: 50%; cursor: pointer;}.current { background-color: #fff; box-shadow: 0 0 10px #fff;}
autoPlay.js：
window.addEventListener(’load’, function() { // 獲取元素 var arrow_l = document.querySelector(’.arrow-l’); var arrow_r = document.querySelector(’.arrow-r’); var focus = document.querySelector(’.focus’); var focusWidth = focus.offsetWidth; // 自定義動(dòng)畫函數(shù)animate的參數(shù)，表示動(dòng)畫間隔 var step = 5; // 鼠標(biāo)經(jīng)過(guò)focus 就顯示左右按鈕，停止計(jì)時(shí)器 focus.addEventListener(’mouseenter’, function() { arrow_l.style.display = ’block’; arrow_r.style.display = ’block’; clearInterval(timer); timer = null; // 清空計(jì)時(shí)器 }); // 鼠標(biāo)離開(kāi)focus 就隱藏左右按鈕，調(diào)用定時(shí)器 focus.addEventListener(’mouseleave’, function() { arrow_l.style.display = ’none’; arrow_r.style.display = ’none’; timer = setInterval(function() { // 手動(dòng)調(diào)用點(diǎn)擊事件 arrow_r.click(); }, 2000); }); var ul = focus.querySelector(’ul’); var ol = focus.querySelector(’.circle’); for (var i = 0; i < ul.children.length; i++) { // 創(chuàng)建 li var li = document.createElement(’li’); // 設(shè)置自定義屬性，記錄小圓圈索引號(hào) li.setAttribute(’index’, i); // li插入ol ol.appendChild(li); // 小圈圈排他思想 生成圈圈同時(shí) 直接綁定事件 li.addEventListener(’click’, function() { for (var i = 0; i < ol.children.length; i++) {ol.children[i].className = ’’; } this.className = ’current’; // 點(diǎn)擊小圈圈，移動(dòng)圖片，移動(dòng)的是ul // 點(diǎn)擊li，拿到當(dāng)前的索引號(hào) var index = this.getAttribute(’index’); // 當(dāng)點(diǎn)擊了li之后，就要把index給num，實(shí)現(xiàn)同步 num = index; // 當(dāng)點(diǎn)擊了li之后，就要把index給circle，實(shí)現(xiàn)同步 circle = index; animate(ul, -index * focusWidth, step); }); } // ol里第一個(gè)li的類名設(shè)置為current ol.children[0].className = ’current’; var num = 0; // circle控制小圓圈的播放 var circle = 0; // 克隆第一章圖片li，放到ul最后面 // 要在生成小圓圈之后克隆 var first = ul.children[0].cloneNode(true); ul.appendChild(first); // 點(diǎn)擊右側(cè)按鈕，圖片滾動(dòng) arrow_r.addEventListener(’click’, function() { // 如果到了最后一張圖片，ul要快速?gòu)?fù)原：left改為0 if (num == ul.children.length - 1) { ul.style.left = 0; num = 0; } num++; animate(ul, -num * focusWidth, step); // circle控制小圓圈的播放 circle++; circle = circle == ol.children.length ? 0 : circle; circleChange(); }); // 點(diǎn)擊左側(cè)按鈕，圖片滾動(dòng) arrow_l.addEventListener(’click’, function() { if (num == 0) { num = ul.children.length - 1; ul.style.left = -num * focusWidth + ’px’; } num--; animate(ul, -num * focusWidth, step); // circle控制小圓圈的播放 circle--; circle = circle < 0 ? (ol.children.length - 1) : circle; circleChange(); }); // 小圈圈改變樣式 function circleChange() { // 排他其他 for (var i = 0; i < ol.children.length; i++) { ol.children[i].className = ’’; } // 留下自己 ol.children[circle].className = ’current’; } // 自動(dòng)播放功能 var timer = setInterval(function() { // 手動(dòng)調(diào)用點(diǎn)擊事件 arrow_r.click(); }, 2000);});
animate.js：
function animate(obj, target, time, callback) { // 先清除以前的定時(shí)器，只保留當(dāng)前的一個(gè)定時(shí)器執(zhí)行 clearInterval(obj.timer); obj.timer = setInterval(function() { // 步長(zhǎng)值寫到定時(shí)器的里面，并設(shè)置為整數(shù) var step = (target - obj.offsetLeft) / 10; step = step > 0 ? Math.ceil(step) : Math.floor(step); if (obj.offsetLeft == target) { clearInterval(obj.timer); // 回調(diào)函數(shù)寫到定時(shí)器結(jié)束里面 callback && callback(); } obj.style.left = obj.offsetLeft + step + ’px’; }, time);}
以上就是JavaScript實(shí)現(xiàn)輪播圖效果的詳細(xì)內(nèi)容，更多關(guān)于JavaScript 輪播圖的資料請(qǐng)關(guān)注好吧啦網(wǎng)其它相關(guān)文章！
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