面对对象的无缝上下滚动的图片特效

2013-10-10 01:38:41 -0400

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片无缝滚动效</title>
<style type="text/css">
body,div,ul,li{margin:0;padding:0;}
body{background:#052D01;font:12px/1.5 arial;}
#box{position:relative;width:210px;height:700px;border:1px solid #5E8743;margin:20px;}
#box div{position:absolute;top:50%;left:50%;width:160px;height:570px;overflow:hidden;margin:-285px 0 0 -80px;}
#box .up,#box .down{position:absolute;left:50%;width:48px;height:48px;z-index:10;cursor:pointer;overflow:hidden;margin-left:-24px;text-indent:-9999px;background:url(http://js.alixixi.com/img/201108/arrow.jpg) no-repeat;}
#box .up{top:10px;background-position:0 0;}
#box .down{bottom:10px;background-position:0 bottom;}
#box ul{position:absolute;width:160px;}
#box li{width:160px;height:190px;list-style:none;text-align:center;}
#box a{color:#fff;font-weight:700;text-decoration:none;}
#box img{width:156px;height:156px;display:block;margin-bottom:5px;border:2px solid #ccc;}
</style>
<script type="text/javascript">
//获取id
function $ (id)
{
 return typeof id === "string" ? document.getElementById(id) : id; 
}
//获取tagName
function $$ (elem, oParent)
{
 return (oParent || document).getElementsByTagName(elem); 
}
//获取class
function $$$ (className, oParent)
{
 var aClass = [];
 var reClass = new RegExp("(//s|^)" + className + "($|//s)");
 var aElem = $$("*", oParent);
 for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
 return aClass
}
//初始化对象
function Roll ()
{
 this.initialize.apply(this, arguments) 
}
Roll.prototype =
{
 initialize: function (obj)
 {
  var _this = this;
  this.obj = $(obj);
  this.oUp = $$$("up", this.obj)[0];
  this.oDown = $$$("down", this.obj)[0];
  this.oList = $$$("list", this.obj)[0];
  this.aItem = this.oList.children;
  this.timer = null;
  this.iNow = 0;
  this.iHeight = this.aItem[0].offsetHeight;
  this.oUp.onclick = function ()
  {
   _this.up() 
  };
  this.oDown.onclick = function ()
  {
   _this.down()
  } 
 },
 up: function ()
 {
  this.oList.insertBefore(this.aItem[this.aItem.length - 1], this.oList.firstChild);
  this.oList.style.top = -this.iHeight + "px";
  this.doMove(0)
 },
 down: function ()
 {
  this.doMove(-this.iHeight, function ()
  {
   this.oList.appendChild(this.aItem[0]);
   this.oList.style.top = 0; 
  })
 },
 doMove: function (iTarget, callBack)
 {
  var _this = this;
  clearInterval(this.timer)
  this.timer = setInterval(function ()
  {
   var iSpeed = (iTarget - _this.oList.offsetTop) / 5;
   iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
   _this.oList.offsetTop == iTarget ? (clearInterval(_this.timer), callBack && callBack.apply(_this)) : _this.oList.style.top = iSpeed + _this.oList.offsetTop + "px"
  }, 30)
 }
};
window.onload = function ()
{
 new Roll("box");
};
</script>
</head>
<body>
<div id="box">
    <span class="up">up</span>
    <span class="down">down</span>
    <div>
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        </ul>
    </div>
</div>
</body>
</html>

点击上面选择框全选代码
-以下为代码演示
图片无缝滚动——阿里西西网页特效,js.alixixi.com

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----Comments(1)----
csngmap (@csngmap) | @ at 2013-10-10 04:36:
转了，谢谢分享

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