这篇文章主要介绍了JavaScript如何实现简易轮播图，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
具体内容如下
完整代码：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>ES6轮播图</title> <script></script> <style> * { margin: 0; padding: 0; } .box { width: 500px; height: 300px; border: 1px solid silver; overflow: hidden; margin: auto; margin-top: 50px; position: relative; top: 0; left: 0; } .outer { list-style: none; position: absolute; top: 0; left: 0; transition: .3s all linear; } .img { width: 500px; height: 300px; float: left; } .btns span { position: absolute; width: 25px; height: 40px; top: 50%; margin-top: -20px; line-height: 40px; text-align: center; font-weight: bold; font-family: Simsun; font-size: 30px; border: 1px solid silver; opacity: 0.5; cursor: pointer; color: #fff; background: black; } .btns .left { left: 5px; } .btns .right { left: 100%; margin-left: -32px; } .right > :first-child, .left > :first-child { width: 35px; height: 35px; } .oOl { width: 163px; position: absolute; right: 0; left: 0; margin: auto; bottom: 10px; list-style: none; } .oLi { width: 25px; height: 25px; background: white; border-radius: 50%; float: left; } .color { background: black; } </style> </head> <body> <div class="box"> <ul class="outer"> <li class="img" ></li> <li class="img" ></li> <li class="img" ></li> <li class="img" ></li> <li class="img" ></li> </ul> <div class="btns"> <span class="left"><</span> <span class="right">></span> </div> </div> </body> <script> class Chart{ constructor(name, json) { //获取盒子名 this.box = document.querySelector(name); this.json = json; //获取轮播图的属性 this.outer = document.querySelector(name + ' .outer'); //注意加空格 this.left = document.querySelector(name + ' .left'); this.right = document.querySelector(name + ' .right'); //初始化 this.timer = null; //自动播放 this.iNow = 0; this.init(); } init() { const that = this; //保存一个this console.log(this.json.a); if (this.json.a){ console.log(1); } //克隆第一张放到最后 let uLi = that.outer.children[0].cloneNode(true); that.outer.appendChild(uLi); that.outer.style.width = that.outer.children.length * that.outer.children[0].offsetWidth + 'px'; //点击左右滑动 if (that.json.slide) { that.left.style.display = 'block'; that.right.style.display = 'block'; this.left.onclick = () => that.rightGo(); this.right.onclick = () => that.leftGo(); } //自动播放 if (that.json.move) { that.moveGo(); //鼠标移入移出 if (that.json.loop) { that.box.onmousemove = () => clearInterval(that.timer); that.box.onmouseout = () => that.moveGo(); } } //展示小圆点 if (that.json.nav) { let oOL = document.createElement('ol'); oOL.className = 'oOl'; oOL.style.left = that.json.distanceLeft + 'px'; that.box.appendChild(oOL); for (let i = 0; i < that.outer.children.length - 1; i++) { let oLi = document.createElement('li'); oLi.className = 'oLi'; oLi.style.marginLeft = that.json.distance + 'px'; oOL.appendChild(oLi); } oOL.style.width = ((that.outer.children.length - 1) * document.querySelector('.oLi').offsetWidth) + (that.json.distance * that.outer.children.length) + 'px'; that.alike(); } }; rightGo() { this.iNow++; if (this.iNow >= this.outer.children.length) { this.iNow = 1; this.outer.style.transition = '0s all linear'; this.outer.style.left = 0; } this.outer.style.left = -this.iNow * this.outer.children[0].offsetWidth + 'px'; this.outer.style.transition = '0.3s all linear'; this.alike(); }; leftGo() { this.iNow--; if (this.iNow <= -1) { this.iNow = this.outer.children.length - 1; this.outer.style.transition = '0s all linear'; this.outer.style.left = -(this.outer.children.length - 1) * this.outer.children[0].offsetWidth + 'px'; this.iNow = this.outer.children.length - 2; } this.outer.style.left = -this.iNow * this.outer.children[0].offsetWidth + 'px'; this.outer.style.transition = '0.3s all linear'; this.alike(); }; moveGo() { const that = this; this.timer = setInterval(() => that.rightGo(), that.json.speed || 1500) }; //圆点对应每张图片 alike() { let li = document.querySelectorAll('.oLi'); for (let i = 0; i < li.length; i++) { li[i].classList.remove('color'); if (i == this.iNow) { li[i].classList.add('color'); } else { li[i].classList.remove('color'); } //特殊：最后一张的时候是第一个 if (this.iNow == li.length) { li[0].classList.add('color'); } //小圆点点击事件 if (this.json.event) { li[i].onmouseover = () => { for (let i = 0; i < li.length; i++) { li[i].classList.remove('color'); } li[i].classList.add('color'); this.outer.style.left = -i * this.outer.children[0].offsetWidth + 'px'; } } } } } new Chart('.box', { move: true, //自动轮播 speed: 1500, //轮播速度 loop: true, //鼠标移入移出效果 slide: true, //点击左右滑动效果 nav: true, //展示小圆点 distance: 20, //小圆点间距 event: true //小圆点事件 }) </script> </html>图片：
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