本文實例講述了JS實現可切換圖片的幻燈切換效果。分享給大家供大家參考，具體如下：
<!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=utf-8"/> <title>JS切換圖片幻燈切換效果</title> <style> body, div, ul, li { margin: 0; padding: 0; } ul { list-style-type: none; } body { background: #000; text-align: center; font: 12px/20px Arial; } #box { position: relative; width: 322px; height: 172px; background: #fff; border-radius: 5px; border: 8px solid #fff; margin: 10px auto; } #box .list { position: relative; width: 320px; height: 240px; overflow: hidden; border: 1px solid #ccc; } #box .list li { position: absolute; top: 0; left: 0; width: 320px; height: 240px; opacity: 0; filter: alpha(opacity=0); } #box .list li.current { opacity: 1; filter: alpha(opacity=100); } #box .count { position: absolute; right: 0; bottom: 5px; } #box .count li { color: #fff; float: left; width: 20px; height: 20px; cursor: pointer; margin-right: 5px; overflow: hidden; background: #F90; opacity: 0.7; filter: alpha(opacity=70); border-radius: 20px; } #box .count li.current { color: #fff; opacity: 1; filter: alpha(opacity=100); font-weight: 700; background: #f60; } #tmp { width: 100px; height: 100px; background: red; position: absolute; } </style> <script type="text/javascript"> window.onload = function() { var oBox = document.getElementById("box"); var aUl = document.getElementsByTagName("ul"); var aImg = aUl[0].getElementsByTagName("li"); var aNum = aUl[1].getElementsByTagName("li"); var timer = play = null; var i = index = 0; var bOrder = true; //切換按鈕 for(i = 0; i < aNum.length; i++) { aNum[i].index = i; aNum[i].onmouseover = function() { show(this.index) } } //鼠標劃過關閉定時器 oBox.onmouseover = function() { clearInterval(play) }; //鼠標離開啟動自動播放 oBox.onmouseout = function() { autoPlay() }; //自動播放函數 function autoPlay() { play = setInterval(function() { //判斷播放順序 bOrder ? index++ : index--; //正序 index >= aImg.length && (index = aImg.length - 2, bOrder = false); //倒序 index <= 0 && (index = 0, bOrder = true); //調用函數 show(index) }, 2000); } autoPlay();//應用 function show(a) { index = a; var alpha = 0; for(i = 0; i < aNum.length; i++)aNum[i].className = ""; aNum[index].className = "current"; clearInterval(timer); for(i = 0; i < aImg.length; i++) { aImg[i].style.opacity = 0; aImg[i].style.filter = "alpha(opacity=0)"; } timer = setInterval(function() { alpha += 2; alpha > 100 && (alpha = 100); aImg[index].style.opacity = alpha / 100; aImg[index].style.filter = "alpha(opacity = " + alpha + ")"; alpha == 100 && clearInterval(timer) }, 20); } }; </script></head><body><div id="box"> <ul class="list"> <li class="current"><img src="img/3.jpg" width="320" height="240"/></li> <li><img src="img/1.jpg" width="320" height="240"/></li> <li><img src="img/2.jpg" width="320" height="240"/></li> <li><img src="img/3.jpg" width="320" height="240"/></li> <li><img src="img/4.jpg" width="320" height="240"/></li> </ul> <ul class="count"> <li class="current">1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> </ul></div></body></html>希望本文所述對大家JavaScript程序設計有所幫助。
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