var timer = null
function ani(ele,target) {
clearInterval(ele.timer)
ele.timer = setInterval(function() {
var step = (target - ele.offsetLeft)/10
step = step>0?Math.ceil(step):Math.floor(step)
ele.style.left = ele.offsetLeft + step + "px"
console.log(1)
if (Math.abs(target - ele.offsetLeft) <= Math.abs(step)) {
ele.style.left = target + "px"
clearInterval(ele.timer)
}
},30)
}
利用动画实现图片位置的移动，也是放一个图片到前面。
第二个就是还是放一张图到前面，然后把带图片的li定位；用一个arr[{left:0},{left:"200px"},{left:"400px"},{left:"600px"}]这样的数组把值分别赋给li；要滚动的时候把arr的最后一项放到最前面，再依次赋值给li，加上过渡就是轮播了，当然直接跳的那一下把过渡关了才是无缝轮播。
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！<!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/htmlcharset=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=1i<=5i++){
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 bluewidth:450pxheight:550px" id="myPic">
<img src="pictures/1.jpg" />
</div>
</body>
</html>
