<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> * { margin: 0; padding: 0; text-decoration: none; } body { padding: 20px; } #container { position: relative; width: 600px; height: 400px; border: 3px solid #333; overflow: hidden; } #list { position: absolute; z-index: 1; width: 4200px; height: 400px; } #list img { float: left; width: 600px; height: 400px; } #buttons { position: absolute; left: 250px; bottom: 20px; z-index: 2; height: 10px; width: 100px; } #buttons span { float: left; margin-right: 5px; width: 10px; height: 10px; border: 1px solid #fff; border-radius: 50%; background: #333; cursor: pointer; } #buttons .on { background: orangered; } .arrow { position: absolute; top: 180px; z-index: 2; display: none; width: 40px; height: 40px; font-size: 36px; font-weight: bold; line-height: 39px; text-align: center; color: #fff; background-color: RGBA(0, 0, 0, .3); cursor: pointer; } .arrow:hover { background-color: RGBA(0, 0, 0, .7); } #container:hover .arrow { display: block; } #prev { left: 20px; } #next { right: 20px; } </style> <script type="text/javascript"> window.onload = function() { var container = document.getElementById('container'); var list = document.getElementById('list'); var buttons = document.getElementById('buttons').getElementsByTagName('span'); var prev = document.getElementById('prev'); var next = document.getElementById('next'); var index = 1; var timer; function animate(offset) { //获取的是style.left，是相对左边获取距离，所以第一张图后style.left都为负值， //且style.left获取的是字符串，需要用parseInt()取整转化为数字。 var newLeft = parseInt(list.style.left) + offset; list.style.left = newLeft + 'px'; //无限滚动判断 if (newLeft > -600) { list.style.left = -3000 + 'px'; } if (newLeft < -3000) { list.style.left = -600 + 'px'; } } function play() { //重复执行的定时器 timer = setInterval(function() { next.onclick(); }, 2000) } function stop() { clearInterval(timer); } function buttonsShow() { //将之前的小圆点的样式清除 for (var i = 0; i < buttons.length; i++) { if (buttons[i].className == "on") { buttons[i].className = ""; } } //数组从0开始，故index需要-1 buttons[index - 1].className = "on"; } prev.onclick = function() { index -= 1; if (index < 1) { index = 5 } buttonsShow(); animate(600); }; next.onclick = function() { //由于上边定时器的作用，index会一直递增下去，我们只有5个小圆点，所以需要做出判断 index += 1; if (index > 5) { index = 1 } animate(-600); buttonsShow(); }; for (var i = 0; i < buttons.length; i++) { (function(i) { buttons[i].onclick = function() { /* 这里获得鼠标移动到小圆点的位置，用this把index绑定到对象buttons[i]上，去谷歌this的用法 */ /* 由于这里的index是自定义属性，需要用到getAttribute()这个DOM2级方法，去获取自定义index的属性*/ var clickIndex = parseInt(this.getAttribute('index')); var offset = 600 * (index - clickIndex); //这个index是当前图片停留时的index animate(offset); index = clickIndex; //存放鼠标点击后的位置，用于小圆点的正常显示 buttonsShow(); } })(i) } container.onmouseover = stop; container.onmouseout = play; play(); } </script> </head> <body> <div id="container"> <div id="list" style="left: -600px;"> <img src="http://images2015.cnblogs.com/blog/32818/201705/32818-20170527142827341-239546623.jpg" alt="1" /> <img src="http://images2015.cnblogs.com/blog/32818/201705/32818-20170527142827341-239546623.jpg" alt="1" /> <img src="http://img.netbian.com/file/2017/0717/9bba6a121f15845698285e7ab3bbda13.jpg" alt="2" /> <img src="http://img.netbian.com/file/2017/0724/bb823c2d94eb4a7b17920ed8d4458c23.jpg" alt="3" /> <img src="http://img.netbian.com/file/2017/0724/93e1f7585986374bf6903e4f95c4fa93.jpg" alt="4" /> <img src="http://img.netbian.com/file/2017/0718/1100e085b03b989d6c2691e7224485af.jpg" alt="5" /> <img src="http://img.netbian.com/file/2017/0724/d8ed03e528840690fdfe89cacba8eb92.jpg" alt="5" /> </div> <div id="buttons"> <span index="1" class="on"></span> <span index="2"></span> <span index="3"></span> <span index="4"></span> <span index="5"></span> </div> <a href="javascript:;" id="prev" class="arrow"><</a> <a href="javascript:;" id="next" class="arrow">></a> </div> </body> </html>