本文实例讲述了js实现非常简单的焦点图切换特效的方法。分享给大家供大家参考。具体分析如下：
这是一个非常非常简单的焦点图（更像滑动门），可供初学者借鉴参考
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title><style type="text/css">* {margin:0;padding:0;}ul, li {list-style:none;}.mid {margin:0 auto;}.area {width:240px;height:270px;overflow:hidden;background:#999;margin-top:150px;position:relative;}#pic_list {position:relative;}#pic_list li {position:absolute;visibility:hidden;}#pic_list li.show {visibility:visible;}#pic_list li img {vertical-align:middle;}.button {width:240px;height:20px;line-height:20px;background:#ccc;position:absolute;bottom:0px;}#button {float:right;}#button li {float:left;width:20px;height:20px;text-align:center;margin:0 3px;font-family:"Arial";font-size:12px;color:#fff;background:#000;}#button li.current {background:#f00;cursor:pointer;}</style></head><body><div class="area mid"> <div id="imgbox" class="bbbb"> <ul id="pic_list" class="aaaa"> <li class="show" id="one"> <img src="images/1317279971_77011100.jpg" width="240" /> </li> <li id="two"> <img src="images/1317279972_01691900.jpg" width="240" /> </li> <li id="three"> <img src="images/1317279973_69082200.jpg" width="240" /> </li> <li id="four"> <img src="images/1317281054_38572100.jpg" width="240" /> </li> <li id="five"> <img src="images/1317281056_61630800.jpg" width="240" /> </li> </ul> </div> <div class="button" class="dddd"> <ul id="button" class="cccc"> <li class="current" id="but_one">1</li> <li id="but_two">2</li> <li id="but_three">3</li> <li id="but_four">4</li> <li id="but_five">5</li> </ul> </div></div><script type="text/javascript">(function(){var imgbox = document.getElementById("imgbox");var pic_list = document.getElementById("pic_list");var pics = pic_list.getElementsByTagName("li");var button = document.getElementById("button").getElementsByTagName("li");var p;var start;function autoplay(start){for(i=start;i<button.length;i++){//设置起始值为start参数. (function(){ var p=i; // 为p赋值i. i等于0,1,2,3,4; button[i].onmouseover=function change(){ //button[0],button[1],button[2],button[3],button[4] //onmouseover可以触发函数; for(j=0;j<this.parentNode.childNodes.length;j++){ //以this(当前触发事件的元素)为起点,的父节点的所有子节点 //的length值为最高值,开始遍历. ; this.parentNode.childNodes[j].className=""; //以this(当前触发事件的元素)为起点 //的父节点的所有子节点的className为空. 危险慎用.; } this.className="current"; //this. 即当前触发onmouseover的元素的className为"current"; for(m=0;m<pics.length;m++){ //以pics.length为最高值进行遍历.遍历pics.; pics[m].className=""; //清空所有pics数组中所有元素的className; if (m==p){ //当m==p (p==i) 所以m=i时,触发下列函数 pics[m].className="show"; //pics的第m个元素的className值为show; m在这里等于i; } } } })(); }}autoplay(0);})();</script></body></html>希望本文所述对大家的javascript程序设计有所帮助。
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