html

<!--图片轮播 Start--><div class="pics-ul"> <div class="pics-ulleft"> <ul id="allImg"> <li><img src="img/img01.png"/></li> <li><img src="img/img2.jpg"/></li> <li><img src="img/img1.jpg"/></li> <li><img src="img/img3.jpg"/></li> <li><img src="img/img4.jpg"/></li> </ul> <a name="btn" id="prev" class="prev" style="display: block;"></a> <a name="btn" id="next" class="next" style="display: block;"></a> <ul id="btn" class="pagination"> <li class="hover"><a href="#0">1</a></li> <li><a href="#1">2</a></li> <li><a href="#2">3</a></li> <li><a href="#3">4</a></li> <li><a href="#4">5</a></li> </ul> </div> <div class="pics-ulright"><img src="img/imgright.png"/></div> </div><!--图片轮播 End-->

js

var but1 = document.getElementById("prev");var abtn = document.getElementById("btn").getElementsByTagName("li"); //获取所有的按钮var lis = document.getElementById('allImg').getElementsByTagName('li');var but2 = document.getElementById("next");var index = 0;var timer = null;but2.onclick = function() { index++; if (index > lis.length - 1) { index = 0; } setImg(index);}but1.onclick = function() { index--; if (index < 0) { index = lis.length - 1; } setImg(index);}function changeImg() { if (index == lis.length - 1) { //当到最后一张图片时 index = 0 } else { index++; //图片索引发生改变 } setImg(index);}function setImg(index) { for (j = 0; j < lis.length; j++) { lis[j].style.display = "none"; } lis[index].style.display = "block"; //按钮的样式要与图片对应 for (var i = 0; i < abtn.length; i++) { abtn[i].className = "" } abtn[index].className = "hover";}//自动切换timer = setInterval(changeImg, 3000);//按钮for (var i = 0; i < abtn.length; i++) { (function() { var p = i abtn[p].onclick = function() { index = p; setImg(index); } })();}

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