Javascript实现图片轮播:(一)让图片跳动起来!-吴统威的博客_html/css_WEB-ITnose
Javascript实现图片轮播:(一)让图片跳动起来!
作者 :towaywu
2016-02-16 11:42:53.0
29 浏览
类别 :HTML/CSS/JAVASCRIPT 前端编程 编程语言
图片轮播效果,在现在的网站的首页,差不多是必备的效果显示. 所以我从三个方面来讲解这一效果的简单实现.
-
图片跳动起来
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图片序列控制的实现
-
前后按钮控制的实现
这篇文章来看图片按照间隔时间进行切换.
我们先把结构代码完成,这个我就不做详细的讲解了.看效果
代码如下:
<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title></title> <style> * { box-sizing: border-box; } a { text-decoration: none; } ul,ol,li{ list-style: none; margin: 0; padding: 0; } #slider{ width: 800px; height: 300px; overflow: hidden; position: relative; margin: 0 auto; } #slider ul{ width: 2400px; position: relative; } #slider ul:after{ content: " "; width: 0; height: 0; display: block; } #slider ul li{ float: left; width: 800px; height: 300px; overflow: hidden; } #slider ul li img{ width: 100%; } #slider ol{ position: absolute; bottom: 10px; left: 46%; } #slider ol li{ display: inline-block; } #slider ol li a{ display: inline-block; padding:4px 8px; border-radius:15px; background-color: #000; color: #fff; } #slider .prev, #slider .next{ display: inline-block; position: absolute; top: 49%; background-color: #000; opacity: 0.6; color: #fff; padding: 3px; } #slider .prev{ left: 10px; } #slider .next{ right: 10px; } </style></head><body> <div id="slider"> <ul> <li> <img src="/static/imghw/default1.png" data-src="http://www.bates-hewett.com/images/sliders/slider-1.jpg" class="lazy" / alt="Javascript实现图片轮播:(一)让图片跳动起来!-吴统威的博客_html/css_WEB-ITnose" > </li> <li> <img src="/static/imghw/default1.png" data-src="http://www.bates-hewett.com/images/sliders/slider-2.jpg" class="lazy" / alt="Javascript实现图片轮播:(一)让图片跳动起来!-吴统威的博客_html/css_WEB-ITnose" > </li> <li> <img src="/static/imghw/default1.png" data-src="http://www.bates-hewett.com/images/sliders/slider-3.jpg" class="lazy" / alt="Javascript实现图片轮播:(一)让图片跳动起来!-吴统威的博客_html/css_WEB-ITnose" > </li> </ul> <ol> <li> <a href="#">1</a> </li> <li> <a href="#">2</a> </li> <li> <a href="#">3</a> </li> </ol> <a href="#">上一张</a> <a href="#">下一张</a> </div></body></html>好的,现在我们来通过JS控制图片的跳转.
首先我们需要找到图片所在的位置,这里我们是通过ul来进行布局的所以首先得找到UL下的LI的数目
接着让图片一张一张的展示,我们使用了视窗的模式,就是遮罩层的模式.#slider是一个视窗,ul是视窗外的景色,而ul得景色是横向排版的
然后就是让外面的景色显示为视窗的大小,也就是让每一张图片作为每一次的视窗景色,这里就是控制图片的大小要与视窗同等大小.
上面讲解的是一个概念,也就是布局的处理,下面我们JS的控制了,要实现图片间隔的显示不同.我们就需要用到JS的setInterval或者setTimeout.这里我们使用setInterval(因为这个用起来方便.)
每跳转一次,我们控制的是UL的position的left,这样就可以让ul下的景色,在每一次都是显示不一样,而这个left是根据视窗的宽度来决定,第一张left当然是-800 * 0 ,第二种就是 -800*1,第三种是-800*2...依次类推.那我们就可以得出下面的代码
<script> (function(){ var slider = document.getElementById("slider"); var imgul = slider.getElementsByTagName("ul")[0]; var imglis = imgul.getElementsByTagName("li"); var len = imglis.length; var index = 0; setInterval(function(){ if(index >= len){ index = 0; } imgul.style.left = - (800 * index) + "px"; index++; },2000); })(); </script>JS代码这样看起来就很简单了. 我这里是设置2秒跳转依次,然后跳转的次数大于等于图片的数目后,让其返回到第一张图片.
本文属于吴统威的博客, 微信公众号:bianchengderen,QQ群:186659233 的原创文章,转载时请注明出处及相应链接:http://www.wutongwei.com/front/infor_showone.tweb?id=202 ,欢迎大家传播与分享.
标签 :javascript教程javascript实例
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