<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<script type="text/javascript">
var timeID;
var image;
var current = 0;
var images = new Array(5);
function init(){
for (var i=1;i<=5;i++){
images[i] = new Image(450,550);
images[i].src = "pictures/"+i+".jpg";
}
image = document.images[0];
}
function setSrc(i){
current = i;
//设置图片src的属性，实现图片的切换
image.src = images[i].src;
}
function pre(){
if (current <= 0){
alert('已经是第一张了');
}else{
current--;
setSrc(current);
}
}
function next(){
if (current >= 5){
alert('已经是最后一张了');
}else{
current++;
setSrc(current);
}
}
function play(){
if (current >= 5){
current = 0;
}
setSrc(++current);
}
</script>
<body onload="init()">
<input type="button" value="第一张" onclick="setSrc(1)">
<input type="button" value="上一张" onclick="pre()">
<input type="button" value="下一张" onclick="next()">
<input type="button" value="最后一张" onclick="setSrc(5)">
<input type="button" value="幻灯播放" onclick="timeID=setInterval('play()',500)">
<input type="button" value="停止播放" onclick="clearInterval(timeID)">
<div style="border:1px solid blue;width:450px; height:550px;" id="myPic">
<img src="pictures/1.jpg" />
</div>
</body>
</html>首先init()函数用于初始化images数组和image的值，本例中主要是利用setSrc()设置图片的src属性值，
这样就达到了图片的切换，图片的轮播是使用定时器来时显的！setInterval('play()',500)的意思是每
0.5s调用一次play()函数！
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