用javascript实现画图效果的代码


答案：<!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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