本篇文章通过代码实例来给大家介绍一下javascript实现焦点图轮播效果。有一定的参考价值,有需要的朋友可以参考一下,希望对大家有所帮助。
JS实现焦点图轮播效果
效果图:
(不过里面的图片路径需要自己改成自己的图片路径,否则是没有图片显示的哦)
代码如下,复制即可使用:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>JS实现焦点图轮播效果</title> <style type="text/css"> * { margin: 0; padding: 0; text-decoration: none; } body { padding: 20px; } #container { width: 600px; height: 400px; border: 3px solid #333; overflow: hidden; position: relative; } #list { width: 4200px; height: 400px; position: absolute; z-index: 1; } #list img { float: left; } #buttons { position: absolute; height: 10px; width: 100px; z-index: 2; bottom: 20px; left: 250px; } #buttons span { cursor: pointer; float: left; border: 1px solid #fff; width: 10px; height: 10px; border-radius: 50%; background: #333; margin-right: 5px; } #buttons .on { background: orangered; } .arrow { cursor: pointer; display: none; line-height: 39px; text-align: center; font-size: 36px; font-weight: bold; width: 40px; height: 40px; position: absolute; z-index: 2; top: 180px; background-color: RGBA(0, 0, 0, .3); color: #fff; } .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 len = 5; var animated = false; var interval = 3000; var timer; function animate(offset) { if(offset == 0) { return; } animated = true; var time = 300; var inteval = 10; var speed = offset / (time / inteval); var left = parseInt(list.style.left) + offset; var go = function() { if((speed > 0 && parseInt(list.style.left) < left) || (speed < 0 && parseInt(list.style.left) > left)) { list.style.left = parseInt(list.style.left) + speed + 'px'; setTimeout(go, inteval); } else { list.style.left = left + 'px'; if(left > -200) { list.style.left = -600 * len + 'px'; } if(left < (-600 * len)) { list.style.left = '-600px'; } animated = false; } } go(); } function showButton() { for(var i = 0; i < buttons.length; i++) { if(buttons[i].className == 'on') { buttons[i].className = ''; break; } } buttons[index - 1].className = 'on'; } function play() { timer = setTimeout(function() { next.onclick(); play(); }, interval); } function stop() { clearTimeout(timer); } next.onclick = function() { if(animated) { return; } if(index == 5) { index = 1; } else { index += 1; } animate(-600); showButton(); } prev.onclick = function() { if(animated) { return; } if(index == 1) { index = 5; } else { index -= 1; } animate(600); showButton(); } for(var i = 0; i < buttons.length; i++) { buttons[i].onclick = function() { if(animated) { return; } if(this.className == 'on') { return; } var myIndex = parseInt(this.getAttribute('index')); var offset = -600 * (myIndex - index); animate(offset); index = myIndex; showButton(); } } container.onmouseover = stop; container.onmouseout = play; play(); } </script> </head> <body> <div id="container"> <div id="list" style="left: -600px;"> <!-- 放最后的一张图片 -图片需要改为自己的图片路径 --> <img src="img/5.jpg" alt="1" /> <img src="img/1.jpg" alt="1" /> <img src="img/2.jpg" alt="2" /> <img src="img/3.jpg" alt="3" /> <img src="img/4.jpg" alt="4" /> <img src="img/5.jpg" alt="5" /> <!-- 放第一张的图片 --> <img src="img/1.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>
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