JS动画效果代码3

慢慢来，这次实现了向任意方向扩展！
复制代码代码如下:
<!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>Untitled Document</title>  
<style type="text/css">  
<!--  
#apDiv1 {  
 position:absolute;  
 left:300px;  
 top:100px;  
 width:100px;  
 height:100px;  
 z-index:1;  
 background-color: #FF00FF;  
}  
#apDiv2 {  
 position:absolute;  
 left:402px;  
 top:100px;  
 width:100px;  
 height:100px;  
 z-index:2;  
 background-color: #00FFFF;  
}  
#apDiv3 {  
 position:absolute;  
 left:402px;  
 top:200px;  
 width:100px;  
 height:100px;  
 z-index:3;  
 background-color: #99FF00;  
}  
#apDiv4 {  
 position:absolute;  
 left:300px;  
 top:200px;  
 width:100px;  
 height:100px;  
 z-index:4;  
 background-color: #FFFF00;  
}  
-->  
</style>  
</head>  

<body>  
    <div id="apDiv1"></div>  
    <div id="apDiv2"></div>  
<div id="apDiv3"></div>  
<div id="apDiv4"></div>  
</body>  
</html>  
<script language="javascript" type="text/javascript">  
function $(pId){  
 return document.getElementById(pId);  
}  

function JPos(){  

}  

JPos.getAbsPos = function(pTarget){  
 var _x = 0;  
 var _y = 0;  
 while(pTarget.offsetParent){  
   _x += pTarget.offsetLeft;  
   _y += pTarget.offsetTop;  
   pTarget = pTarget.offsetParent;  
 }  
 _x += pTarget.offsetLeft;  
 _y += pTarget.offsetTop;  

 return {x:_x,y:_y};  
}  

function JAniObj(){  
 this.obj = null;  
 this.interval = null;  

 this.orgPos = null;  
 this.targetPos = null;  

 this.orgSize = {w:50,y:50};  //初始长宽  
 this.targetSize = {w:100,y:100}; //目标长宽  
 this.step  = {x:10,y:10};  //步长 x:x方向　y:y方向  
 this.alpha  = {s:10,e:90,t:10};  //透明度，s初始，e结束,t步长  
}  

function JAni(){  
 var self = this;  
 var aniObjs = {};  

 var getCurrentStyleProperty = function(pObj,pProperty){  
  try{   
   if(pObj.currentStyle)  
    return eval("pObj.currentStyle." + pProperty);  
   else  
    return document.defaultView.getComputedStyle(pObj,"").getPropertyValue(pProperty);  
  }catch(e){  
   alert(e);  
  }  
 }  

 this.popup = function(pDiv,pOrgSize,pTargetSize,pStep,pAlpha){  

  var aniObj = new JAniObj();  
  aniObjs[pDiv] = aniObj;  

  with(aniObj){  
   obj   = $(pDiv);  
   orgPos  = JPos.getAbsPos(obj);  
   orgSize  = pOrgSize;  
   targetSize = pTargetSize;  
   step  = pStep;  
   alpha  = pAlpha;  

   with(obj.style){  
    overflow = "hidden";  
    position = "absolute";  
    width = pOrgSize.w + "px";  
    height = pOrgSize.h + "px";  
    left = orgPos.x + "px";  
    top = orgPos.y + "px";   
    if(document.all){  
     filter = "Alpha(opacity=" + pAlpha.s + ")";  
    }else  
     opacity = pAlpha.s / 100;  
   }     
  }  

  aniObj.interval = setInterval("popup_('" + pDiv + "')",10);  
 }  

 popup_ = function(pDivId){  

    
  pObj = aniObjs[pDivId];  

  var w = parseInt(pObj.obj.style.width);  
  var h = parseInt(pObj.obj.style.height);  

  if(w >= Math.abs(pObj.targetSize.w) && h >= Math.abs(pObj.targetSize.h)){  
   clearInterval(pObj.interval);  
   if(document.all)  
    pObj.obj.style.filter = "Alpha(opacity=" + pObj.alpha.e + ")";  
   else  
    pObj.obj.style.opacity = pObj.alpha.e / 100;  

     

   delete aniObjs[pObj.obj.id];  
  }else{  
   if(w < Math.abs(pObj.targetSize.w))  
    w += pObj.step.x;  

   if(h < Math.abs(pObj.targetSize.h))  
    h += pObj.step.y;  

   if(document.all){  
    var pattern = /opacity=(\d{1,3})/;  
    var result = pattern.exec(pObj.obj.style.filter);  
    if(result != null){  
     if(result[1] < pObj.alpha.e)  
      pObj.obj.style.filter = "Alpha(opacity=" + (result[1] + pObj.alpha.t) + ")"  
     else  
      pObj.obj.style.filter = "Alpha(opacity=" + pObj.alpha.e + ")";  
    }  
   }else{  
    if(pObj.obj.style.opacity < pObj.alpha.e / 100){  
     pObj.obj.style.opacity = parseFloat(pObj.obj.style.opacity) + pObj.alpha.t / 100;  
    }else  
     pObj.obj.style.opacity = pObj.alpha.e / 100;  
   }  
  }  

  pObj.obj.style.width = w + "px";  
  pObj.obj.style.height = h + "px";  

  if(pObj.targetSize.w < 0){  
   var vLeft = parseInt(getCurrentStyleProperty(pObj.obj,"left"));  
   vLeft = isNaN(vLeft) ? 0 : vLeft;  
   pObj.obj.style.left = vLeft - pObj.step.x + "px";  
  }  

  if(pObj.targetSize.h < 0){  
   var vTop = parseInt(getCurrentStyleProperty(pObj.obj,"top"));  
   vTop = isNaN(vTop) ? 0 : vTop;  
   pObj.obj.style.top = vTop - pObj.step.y + "px";  
  }    
 }  
}  

var ani = new JAni();  
 ani.popup(  
    "apDiv1",  
    {w:50,h:50}, //初始长宽  
    {w:200,h:200}, //目标长宽  
    {x:8,y:8},  //步长  
    {s:10,e:80,t:10}//透明度 起始，结束，步长  
    );  

 ani.popup(  
    "apDiv2",  
    {w:50,h:50}, //初始长宽  
    {w:-200,h:200}, //目标长宽  
    {x:8,y:8},  //步长  
    {s:10,e:40,t:2}//透明度 起始，结束，步长  
    );  

 ani.popup(  
    "apDiv3",  
    {w:50,h:50}, //初始长宽  
    {w:-200,h:-200},//目标长宽  
    {x:8,y:8},  //步长  
    {s:10,e:40,t:10}//透明度 起始，结束，步长  
    );  

 ani.popup(  
    "apDiv4",  
    {w:50,h:50}, //初始长宽  
    {w:200,h:-200},//目标长宽  
    {x:8,y:8},  //步长  
    {s:10,e:50,t:10}//透明度 起始，结束，步长  
    );    
</script> 
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