js实现简单的轮播图效果

本文实例为大家分享了js实现简单的轮播图效果的具体代码，供大家参考，具体内容如下

代码：

js:

window.onload = function() {
 //banner 自动播放
 var oBanner = document.getElementById('banner');
 var aLi = oBanner.getElementsByTagName('li');
 var oJumpBtn = document.getElementById('jumpBtn');
 var aBtn = oJumpBtn.getElementsByTagName('li');
 var oPreImg = document.getElementById('preImg');
 var oNexImg = document.getElementById('nexImg');
 var iNow = 0;
 var timer = null;
 for (var i = 0; i < aBtn.length; i++) {
 aBtn[i].index = i;
 aBtn[i].onclick = function() {
 iNow = this.index;
 tab();
 };
 }

 function tab() {
 for (var i = 0; i < aBtn.length; i++) {
 aBtn[i].style.background = '#ccc';
 aLi[i].style.opacity = 0;
 }
 aBtn[iNow].style.background = '#CF0F32';
 aLi[iNow].style.opacity = 1;
 }

 function tick() {
 iNow++;
 if (iNow == aBtn.length) {
 iNow = 0;
 }
 tab();
 }

 timer = setInterval(tick, 2000);

 oPreImg.onclick = function() {
 iNow--;
 if (iNow < 0) {
 iNow = aBtn.length - 1;
 }
 tab();
 };
 oNexImg.onclick = tick;

 oBanner.onmouseover = function() {
 clearInterval(timer);
 };
 oBanner.onmouseout = function() {
 timer = setInterval(tick, 2000);
 };
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。