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用javascript实现画图效果的代码_javascript技巧

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<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"> 
 
</style> 
</head>

<body> 
 
 
 
 
</body> 
</html> 
 
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>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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