本文實例講述了js實現非常簡單的焦點圖切換特效的方法。分享給大家供大家參考。具體分析如下：
這是一個非常非常簡單的焦點圖（更像滑動門），可供初學者借鑒參考
<!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>無標題文檔</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++){//設置起始值為start參數. (function(){ var p=i; // 為p賦值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可以觸發函數; for(j=0;j<this.parentNode.childNodes.length;j++){ //以this(當前觸發事件的元素)為起點,的父節點的所有子節點 //的length值為最高值,開始遍歷. ; this.parentNode.childNodes[j].className=""; //以this(當前觸發事件的元素)為起點 //的父節點的所有子節點的className為空. 危險慎用.; } this.className="current"; //this. 即當前觸發onmouseover的元素的className為"current"; for(m=0;m<pics.length;m++){ //以pics.length為最高值進行遍歷.遍歷pics.; pics[m].className=""; //清空所有pics數組中所有元素的className; if (m==p){ //當m==p (p==i) 所以m=i時,觸發下列函數 pics[m].className="show"; //pics的第m個元素的className值為show; m在這里等于i; } } } })(); }}autoplay(0);})();</script></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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