JS图片切换效果，上下缓冲式的幻灯片代码

发布时间：2018-08-21 04:10:35 所属栏目：Asp教程来源：站长网

导读：JS图片切换效果，上下缓冲式的幻灯片代码。原生JS图片轮播，带缓冲效果，那些可控的按钮根据图片数量自动生成，可自动调整轮播顺序。演示： !DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transi

　　JS图片切换效果，上下缓冲式的幻灯片代码。原生JS图片轮播，带缓冲效果，那些可控的按钮根据图片数量自动生成，可自动调整轮播顺序。

　　演示：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>自动播放——幻灯片缓冲效果</title> <style> body,div,ul,li{margin:0;padding:0;} ul{list-style-type:none;} body{background:#000;text-align:center;font:12px/20px Arial;} #box{position:relative;width:492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;cursor:pointer;} #box .list{position:relative;width:490px;height:170px;overflow:hidden;} #box .list ul{position:absolute;top:0;left:0;} #box .list li{width:490px;height:170px;overflow:hidden;} #box .count{position:absolute;right:0;bottom:5px;} #box .count li{color:#fff;float:left;width:20px;height:20px;cursor:pointer;margin-right:5px;overflow:hidden;background:#F90;opacity:0.7;filter:alpha(opacity=70);border-radius:20px;} #box .count li.current{color:#fff;opacity:1;filter:alpha(opacity=100);font-weight:700;background:#f60;} #tmp{width:100px;height:100px;background:red;position:absolute;} </style> <script type="text/javascript"> window.onload = function () { var oBox = document.getElementById("box"); var oList = oBox.getElementsByTagName("ul")[0]; var aImg = oBox.getElementsByTagName("img"); var timer = playTimer = null; var index = i = 0; var bOrder = true; var aTmp = []; //生成数字按钮 for (i = 0; i < aImg.length; i++) { aTmp.push("<li>" + (i + 1) + "</li>") } //插入元素 var oCount = document.createElement("ul"); oCount.className = "count" oCount.innerHTML = aTmp.join(""); oBox.appendChild(oCount); //初始化状态 var aBtn = oBox.getElementsByTagName("ul")[1].getElementsByTagName("li"); aBtn[index].className = "current"; //按钮点击切换 for (i = 0; i < aBtn.length; i++) { aBtn[i].index = i; aBtn[i].onclick = function () { index = this.index; for (i = 0; i < aBtn.length; i++) aBtn[i].className = ""; this.className = "current"; startMove(-(this.index * aImg[0].offsetHeight)) } } //烈火網 lieｈｕｏ.nｅt 欢迎复制,拒绝恶意采集ｌｉｅｈｕｏ．ｎｅｔ //鼠标移入展示区停止自动播放 oBox.onmouseover = function () { clearInterval(playTimer) }; //鼠标离开展示区开始自动播放 oBox.onmouseout = function () { autoPlay() }; //页面加载即调用自动播放 oBox.onmouseout(); //自动播放函数 function autoPlay() { playTimer = setInterval(function () { bOrder ? index++ : index--; index == aBtn.length - 1 && (bOrder = false); index == 0 && (bOrder = true); aBtn[index].onclick(); startMove(-(index * aImg[0].offsetHeight)) }, 3000) } function startMove(iTarget) { clearInterval(timer); timer = setInterval(function () { doMove(iTarget) }, 30) } function doMove (iTarget) { var iSpeed = (iTarget - oList.offsetTop) / 10; iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed); oList.offsetTop == iTarget ? clearInterval(timer) : oList.style.top = oList.offsetTop + iSpeed + "px" } }; </script> </head> <body> <div id="box"> <div class="list"> <ul> <li><img src="/uploads/common/images/p5.jpg" width="490" height="170" /></li> <li><img src="/uploads/common/images/p6.jpg" width="490" height="170" /></li> <li><img src="/uploads/common/images/p7.jpg" width="490" height="170" /></li> </ul> </div> </div> </body> </html><br /><center>如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.veryhuo.com/' target='_blank'>http://www.veryhuo.com/</a></center>
提示：可修改后代码再运行!

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