具体代码如下：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> *{ margin:0; padding:0; font-size:14px; -webkit-user-select:none; } ul,li{ list-style } img{ display: block; border:none; } .banner{ position:relative; width:1000px; height:300px; margin:0 auto; overflow:hidden; } .banner .bannerInner{ width:100%; height:100%; background:url("../img/default.gif") no-repeat center center #e1e1e1; } .banner .bannerInner div{ position:absolute; width:100%; height:100%; top:0; left:0; z-index:0; opacity:0; filter:alpha(opacity=0); } .banner .bannerInner img{ display:none; width:100%; height:100%s; } .banner .bannerTip{ position:absolute; height:18px; overflow:hidden; right:20px; bottom:20px; z-index:10; } .banner .bannerTip li{ float:left; margin-left:10px; width:18px; height:18px; background:lightblue; cursor:pointer; border-radius:50%; } .banner .bannerTip li.bg{ background:red; } .banner a{ display:none; position:absolute; top:50%; z-index:20; margin-top:-22.5px; width:30px; height:45px; background:url("../img/pre.png"); opacity:0.5; filter:alpha(opacity=50); } .banner a:hover{ opacity:1; filter:alpha(opacity=100); } .banner a.bannerLeft{ left:20px; background-position:0 0; } .banner a.bannerRight{ right:20px; background-position:-50px 0; } </style> </head> <body> <div> <div> <div><img src="" alt="" trueImg="img/banner1.jpg"></div> <div><img src="" alt="" trueImg="img/banner2.jpg"></div> <div><img src="" alt="" trueImg="img/banner3.jpg"></div> <div><img src="" alt="" trueImg="img/banner4.jpg"></div> </div> <ul> <li></li> <li></li> <li></li> <li></li> </ul> <a href="javascript:;"></a> <a href="javascript:;"></a> </div> <script> var banner = document.getElementById('banner'); var bannerInner = utils.firstChild(banner),bannerTip = utils.children(banner,"ul")[0],bannerLink = utils.children(banner,'a'),bannerLeft = bannerLink[0],bannerRight = bannerLink[1]; var divList = bannerInner.getElementsByTagName('div'); var imgList = bannerInner.getElementsByTagName('img'); var oLis = bannerTip.getElementsByTagName('li'); //1、Ajax读取数据 var jsonData = null; ~function(){ var xhr = new XMLHttpRequest; xhr.open("get","json/banner.txt?_="+Math.random(),false); xhr.onreadystatechange = function(){ if(xhr.readyState ===4 && /^2\d{2}$/.test(xhr.status)){ jsonData = utils.formatJSON(xhr.responseText) } } xhr.send(null) }() //2、数据绑定 ~function(){ var str = "",str2 = ""; if(jsonData){ for(var i = 0,len=jsonData.length;i<len;i++){ var curData = jsonData[i]; str+='<div><img src="" alt="" trueImg="'+curData['img']+'"></div>'; i===0?str2+="<li></li>":str2+="<li></li>" } } bannerInner.innerHTMl = str; bannerTip.innerHTML = str2; }() //3、图片的延迟加载 window.setTimeout(lazyImg,500) function lazyImg(){ for(var i = 0,len = imgList.length;i<len;i++){ ~function(i){ var curImg = imgList[i]; var oImg = new Image; oImg.src = curImg.getAttribute('trueImg'); oImg.onload = function(){ curImg.src = this.src; curImg.style.display = block; //只对第一张处理 if(i===0){ var curDiv = curImg.parentNode; curDiv.style.zIndex = 1; myAnimate(curDiv,{opacity:1},200); } oImg = null; } }(i) } } //4、自动轮播 var interval = 3000,autoTimer = null,step = 0; autoTimer = window.setInterval(autoMove,interval); function autoMove(){ //当已经把最后一张展示完成后(step等于最后一张的索引),我们应该展示第一张，我们让step = -1,这样再经过一次累加，step就变为0，来展示第一张 if(step === jsonData.length-1){ step = -1 } step++; setBanner(); } //实现轮播图切换效果的代码 function setBanner(){ //1、让step索引对应的那个DIV的zIndex的值为1，其他的zIndex为0 for(var i = 0,len = divList.length;i<len;i++){ var curDiv = divList[i]; if(i===step){ utils.css(curDiv,"zIndex",1) //2、让当前的透明度从0变为1,当动画结束，我们需要让其他的div的透明度的值直接变为0 myAnimate(curDiv,{opacity:1},200,function(){ var curDivSib = utils.siblings(this); for(var k = 0,len = curDivSib.length;k<len;k++){ utils.css(curDivSib[k],'opacity',0) } }) continue } utils.css(curDiv,"zIndex",0) } //实现焦点对其 for(i = 0,len = oLis.length;i<len;i++){ var curLi = oLis[i]; i === step?utils.addClass(curLi,"bg"):utils.removeClass(curLi,"bg"); } } //5、实现鼠标悬停停止自动轮播和离开在开启自动轮播 banner.onmouseover = function(){ window.clearInterval(autoTimer); bannerLeft.style.display = bannerRight.style.display = "block" } banner.onmouseout = function(){ autoTimer = window.setInterval(autoMove,interval); bannerLeft.style.display = bannerRight.style.display = "none" } //6、实现点击焦点切换 ~function(){ for(var i = 0,len = oLis.length;i<len;i++){ var curLi = oLis[i]; curLi.index = i; curLi.onclick = function(){ step = this.index; setBanner(); } } }() //7、实现左右切换 bannerRight.onclick = autoMove; bannerLeft.onclick = function(){ if(step === 0){ step = jsonData.length; } step--; setBanner(); } </script> </body> </html>
以上这篇js学习总结_轮播图之渐隐渐现版(实例讲解)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
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