图片轮播特效
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1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <title>自动播放——幻灯片缓冲效果</title> 6 <style> 7 body,div,ul,li{margin:0;padding:0;} 8 ul{list-style-type:none;} 9 body{background:#000;text-align:center;font:12px/20px Arial;} 10 #box{position:relative;width:492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;cursor:pointer;} 11 #box .list{position:relative;width:490px;height:170px;overflow:hidden;} 12 #box .list ul{position:absolute;top:0;left:0;} 13 #box .list li{width:490px;height:170px;overflow:hidden;} 14 #box .count{position:absolute;right:0;bottom:5px;} 15 #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;} 16 #box .count li.current{color:#fff;opacity:1;filter:alpha(opacity=100);font-weight:700;background:#f60;} 17 #tmp{width:100px;height:100px;background:red;position:absolute;} 18 </style> 19 <script type="text/javascript"> 20 window.onload = function () 21 { 22 var oBox = document.getElementById("box"); 23 var oList = oBox.getElementsByTagName("ul")[0]; 24 var aImg = oBox.getElementsByTagName("img"); 25 var timer = playTimer = null; 26 var index = i = 0; 27 var bOrder = true; 28 var aTmp = []; 29 var aBtn = null; 30 31 //生成数字按钮 32 for (i = 0; i < aImg.length; i++) aTmp.push("<li>" + (i + 1) + "</li>"); 33 34 //插入元素 35 var oCount = document.createElement("ul"); 36 oCount.className = "count"; 37 oCount.innerHTML = aTmp.join(""); 38 oBox.appendChild(oCount); 39 aBtn = oBox.getElementsByTagName("ul")[1].getElementsByTagName("li"); 40 41 //初始化状态 42 cutover(); 43 44 //按钮点击切换 45 for (i = 0; i < aBtn.length; i++) 46 { 47 aBtn[i].index = i; 48 aBtn[i].onmouseover = function () 49 { 50 index = this.index; 51 cutover() 52 } 53 } 54 55 function cutover() 56 { 57 for (i = 0; i < aBtn.length; i++) aBtn[i].className = ""; 58 aBtn[index].className = "current"; 59 startMove(-(index * aImg[0].offsetHeight)) 60 } 61 62 function next() 63 { 64 bOrder ? index++ : index--; 65 index <= 0 && (index = 0, bOrder = true); 66 index >= aBtn.length - 1 && (index = aBtn.length - 1, bOrder = false) 67 cutover() 68 } 69 70 playTimer = setInterval(next, 3000); 71 72 //鼠标移入展示区停止自动播放 73 oBox.onmouseover = function () 74 { 75 clearInterval(playTimer) 76 }; 77 78 //鼠标离开展示区开始自动播放 79 oBox.onmouseout = function () 80 { 81 playTimer = setInterval(next, 3000) 82 }; 83 function startMove(iTarget) 84 { 85 clearInterval(timer); 86 timer = setInterval(function () 87 { 88 doMove(iTarget) 89 }, 30) 90 } 91 function doMove (iTarget) 92 { 93 var iSpeed = (iTarget - oList.offsetTop) / 10; 94 iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed); 95 oList.offsetTop == iTarget ? clearInterval(timer) : oList.style.top = oList.offsetTop + iSpeed + "px" 96 } 97 }; 98 </script> 99 </head> 100 <body> 101 <div id="box"> 102 <div class="list"> 103 <ul> 104 <li><img src="img/01.jpg" width="490" height="170" /></li> 105 <li><img src="img/02.jpg" width="490" height="170" /></li> 106 <li><img src="img/03.jpg" width="490" height="170" /></li> 107 <li><img src="img/04.jpg" width="490" height="170" /></li> 108 <li><img src="img/05.jpg" width="490" height="170" /></li> 109 </ul> 110 </div> 111 </div> 112 </body> 113 </html>
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