具體代碼如下：
<!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 class='banner' id='banner'> <div class='bannerInner'> <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 class='bannerTip'> <li class='bg'></li> <li></li> <li></li> <li></li> </ul> <a href="javascript:;" rel="external nofollow" rel="external nofollow" class='bannerLeft'></a> <a href="javascript:;" rel="external nofollow" rel="external nofollow" class='bannerRight'></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讀取數(shù)據(jù) 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、數(shù)據(jù)綁定 ~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 class='bg'></li>":str2+="<li></li>" } } bannerInner.innerHTMl = str; bannerTip.innerHTML = str2; }() //3、圖片的延遲加載 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; //只對(duì)第一張?zhí)幚? if(i===0){ var curDiv = curImg.parentNode; curDiv.style.zIndex = 1; myAnimate(curDiv,{opacity:1},200); } oImg = null; } }(i) } } //4、自動(dòng)輪播 var interval = 3000,autoTimer = null,step = 0; autoTimer = window.setInterval(autoMove,interval); function autoMove(){ //當(dāng)已經(jīng)把最后一張展示完成后(step等于最后一張的索引),我們應(yīng)該展示第一張，我們讓step = -1,這樣再經(jīng)過(guò)一次累加，step就變?yōu)?，來(lái)展示第一張 if(step === jsonData.length-1){ step = -1 } step++; setBanner(); } //實(shí)現(xiàn)輪播圖切換效果的代碼 function setBanner(){ //1、讓step索引對(duì)應(yīng)的那個(gè)DIV的zIndex的值為1，其他的zIndex為0 for(var i = 0,len = divList.length;i<len;i++){ var curDiv = divList[i]; if(i===step){ utils.css(curDiv,"zIndex",1) //2、讓當(dāng)前的透明度從0變?yōu)?,當(dāng)動(dòng)畫(huà)結(jié)束，我們需要讓其他的div的透明度的值直接變?yōu)? 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) } //實(shí)現(xiàn)焦點(diǎn)對(duì)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、實(shí)現(xiàn)鼠標(biāo)懸停停止自動(dòng)輪播和離開(kāi)在開(kāi)啟自動(dòng)輪播 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、實(shí)現(xiàn)點(diǎn)擊焦點(diǎn)切換 ~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、實(shí)現(xiàn)左右切換 bannerRight.onclick = autoMove; bannerLeft.onclick = function(){ if(step === 0){ step = jsonData.length; } step--; setBanner(); } </script></body></html>以上這篇js學(xué)習(xí)總結(jié)_輪播圖之漸隱漸現(xiàn)版(實(shí)例講解)就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持武林網(wǎng)。
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