html结构
<!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:none; } img{ display:block; border:none; } a{ display:block; color:#000; text-decoration: none; } a:hover,a:active,a:visited,a:target{ display:block; color:#000; text-decoration: none; } .banner{ position:relative; margin:0 auto; width:1000px; height:300px; overflow:hidden; } .banner .inner{ position:absolute; top:0; left:0; height:300px; width:1000px;/*在JS数据绑定结束后根据请求数据的多少来动态调整宽度*/} .banner .inner div{float:left; width:1000px; height:300px; background:url('img/default.gif') no-repeat center center #e1e1e1; } .banner .inner img{ display:none; width:100%; height:100%; opacity:0; filter:alpha(opacity=0); } .banner .bannerTip{ height:18px; position:absolute; right:20px; bottom:20px; } .banner .bannerTip li{float:left; margin-left:10px; width:18px; height:18px; border-radius:50%; background:lightblue; cursor:pointer; } .banner .bannerTip li.bg{ background:red; } .banner a{ display:none; position:absolute; top:50%; margin-top:-22.5px; width:30px; height:45px; background-image:url("img/pre.png"); background-repeat:no-repeat; 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:-45px 0; }</style> </head> <body> <div class='banner' id='banner'> <div class='inner'> <div><img src="img/banner1.jpg" alt=""></div> <div><img src="img/banner2.jpg" alt=""></div> <div><img src="img/banner3.jpg" alt=""></div> <div><img src="img/banner4.jpg" alt=""></div> </div> <ul class='bannerTip'> <li class='bg'></li> <li></li> <li></li> <li></li> </ul> <a href="javascript:;" class='bannerLeft'></a> <a href="javascript:;" class='bannerRight'></a> </div> </body> </html>
js
(function(){var banner = document.getElementById('banner');var bannerInner = utils.firstChild(banner);var bannerTip = utils.children(banner,'ul')[0];var imgList = bannerInner.getElementsByTagName('img');var oLis = bannerTip.getElementsByTagName('li');var bannerLeft = utils.children(banner,'a')[0];var bannerRight = utils.children(banner,'a')[1];//实现数据绑定:Ajax请求数据、按照字符串拼接的方式绑定数据var jsonData = null,count = null~function(){var xhr = new XMLHttlRequest; 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); }()~function(){//绑定轮播图区域的数据var str = "";if(jsonData){for(var i = 0,len = jsonData.length;i<len;i++){ str+='<div><img src="" trueImg="'+jsonData[i]['img']+'"></div>'}//为了实现无缝滚动,需要把第一张克隆一份放在末尾str+= '<div><img src="" trueImg="'+jsonData[0]['img']+'"></div>'} bannerInner.innerHTML = str; count = jsonData.length+1; utils.css(bannerInner,"width",count*1000);//绑定焦点区域的数据str = '';if(jsonData){for(var i = 0,len = jsonData.length;i<len;i++){ i===0?str+='<li class="bg"></li>':str+='<li></li>'; } } bannerTip.innerHTML = str; }()//图片延迟加载function lazyImg(){for(var i = 0,len = imgList.length;i<len;i++){~function(i){//这里使用闭包,来避免onload事件异步导致的只有最后一张图片延迟加载的问题var curImg = imgList[i];var oImg = new Image; oImg.src = curImg.getAttribute('trueImg'); oImg.onload = function(){ curImg.src = this.src; curImg.style.display = "block"; oImg = null; myAnimate(curImg,{opacity:1},300) } }(i) } } window.setTimeout(lazyImg,500);var step = 0;//记录的是步长,(当前是哪一张图片,0是第一张图片)//实现自动轮播var autoTimer = window.setInterval(autoMove,2000);function autoMove(){if(step===count-1){ step =0; bannerInner.style.left = 0} step++; myAnimate(bannerInner,{left:-step*1000},500) changeTip(); }//实现焦点对齐function changeTip(){var tempStep = step > oLis.length-1 ? 0 : step;for(var i = 0,len = oLis.length;i<len;i++){var curLi = oLis[i]; i === tempStep ? utils.addClass(curLi,"bg") : utils.removeClass(curLi,"bg") } }//鼠标滑过停止和开启轮播banner.onmouseover = function(){ window.clearInterval(autoTimer); bannerLeft.style.display = bannerRight.style.display = 'block'; } banner.onmouseout = function(){ autoTimer = window.setInterval(autoTimer,2000); bannerLeft.style.display = bannerRight.style.display = 'none'; }//点击焦点实现轮播图的切换~function(){for(var i = 0,len = oLis.length;i<len;i++){var curLi = oLis[i]; curLi.index = i; curLi.onclick = function(){ step = this.index; changeTip(); myAnimate(bannerInner,{left:-step*1000},500) } } }()//实现左右切换bannerRight.onclick = autoMove(); bannerLeft.onclick = function(){if(step<=0){ step = count-1; utils.css(bannerInner,"left",-step*1000); } step--; autoMove(); } })()
绑定的数据
[ {"img":"img/banner1.jpg","desc":"第一张轮播图"}, {"img":"img/banner2.jpg","desc":"第二张轮播图"}, {"img":"img/banner3.jpg","desc":"第三张轮播图"}, {"img":"img/banner4.jpg","desc":"第四张轮播图"} ]
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