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>
