动画测试：可控制的透明度渐变、位置移动、尺寸变化的窗口-图层样式-代码家园

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>动画测试：可控制的透明度渐变、位置移动、尺寸变化的窗口</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">

<script language="javascript">
function rand(min,max){
 return Math.round(min+(Math.random()*(max-min)));
};
var fade = function(element, transparency, speed, callback){//透明度渐变：transparency：透明度0（全透）-100（不透）；speed：速度1-100，默认为1
 if(typeof(element)=='string')element=document.getElementById(element);
 if(!element.effect){
  element.effect = {};
  element.effect.fade=0;
 }
 clearInterval(element.effect.fade);
 var speed=speed||1;
 var start=(function(elem){
  var alpha;
  if(navigator.userAgent.toLowerCase().indexOf('msie') != -1){
    alpha=elem.currentStyle.filter.indexOf("opacity=") >= 0?(parseFloat( elem.currentStyle.filter.match(/opacity=([^)]*)/)[1] )) + '':
    '100';
  }else{
    alpha=100*elem.ownerDocument.defaultView.getComputedStyle(elem,null)['opacity'];
  }
  return alpha;
 })(element);
 if(window.console&&window.console.log)console.log('start: '+start+" end: "+transparency);
 element.effect.fade = setInterval(function(){
  start = start < transparency ? Math.min(start + speed, transparency) : Math.max(start - speed, transparency);
  element.style.opacity =  start / 100;
  element.style.filter = 'alpha(opacity=' + start + ')';
  if(Math.round(start) == transparency){
   element.style.opacity =  transparency / 100;
   element.style.filter = 'alpha(opacity=' + transparency + ')';
   clearInterval(element.effect.fade);
   if(callback)callback.call(element);
  }
 }, 20);
};
var move = function(element, position, speed, callback){//移动到指定位置：position：移动到指定left及top，格式{left:120,top:340}或{left:120}或{top:340}；speed：速度1-100，默认为10
 if(typeof(element)=='string')element=document.getElementById(element);
 if(!element.effect){
  element.effect = {};
  element.effect.move=0;
 }
 clearInterval(element.effect.move);
 var speed=speed||10;
 var start=(function(elem){
  var posi = {left:elem.offsetLeft, top:elem.offsetTop};
  while(elem = elem.offsetParent){
   posi.left += elem.offsetLeft;
   posi.top += elem.offsetTop;
  };
  return posi;
 })(element);
 element.style.position = 'absolute';
 var style = element.style;
 var styleArr=[];
 if(typeof(position.left)=='number')styleArr.push('left');
 if(typeof(position.top)=='number')styleArr.push('top');
 element.effect.move = setInterval(function(){
  for(var i=0;i<styleArr.length;i++){
   start[styleArr[i]] += (position[styleArr[i]] - start[styleArr[i]]) * speed/100;
   style[styleArr[i]] = start[styleArr[i]] + 'px';
  }
  for(var i=0;i<styleArr.length;i++){
   if(Math.round(start[styleArr[i]]) == position[styleArr[i]]){
    if(i!=styleArr.length-1)continue;
   }else{
    break;
   }
   for(var i=0;i<styleArr.length;i++)style[styleArr[i]] = position[styleArr[i]] + 'px';
   clearInterval(element.effect.move);
   if(callback)callback.call(element);
  }
 }, 20);
};
var resize = function(element, size, speed, callback){//长宽渐变：size：要改变到的尺寸，格式{width:400,height:250}或{width:400}或{height:250}；speed：速度1-100，默认为10
 if(typeof(element)=='string')element=document.getElementById(element);
 if(!element.effect){
  element.effect = {};
  element.effect.resize=0;
 }
 clearInterval(element.effect.resize);
 var speed=speed||10;
 var start = {width:element.offsetWidth, height:element.offsetHeight};
 var styleArr=[];
 if(!(navigator.userAgent.toLowerCase().indexOf('msie') != -1&&document.compatMode == 'BackCompat')){
  //除了ie下border-content式盒模型情况外，需要对size加以修正
  var CStyle=document.defaultView?document.defaultView.getComputedStyle(element,null):element.currentStyle;
  if(typeof(size.width)=='number'){
   styleArr.push('width');
   size.width=size.width-CStyle.paddingLeft.replace(/\D/g,'')-CStyle.paddingRight.replace(/\D/g,'');
  }
  if(typeof(size.height)=='number'){
   styleArr.push('height');
   size.height=size.height-CStyle.paddingTop.replace(/\D/g,'')-CStyle.paddingBottom.replace(/\D/g,'');
  }
 }
 element.style.overflow = 'hidden';
 var style = element.style;
 element.effect.resize = setInterval(function(){
  for(var i=0;i<styleArr.length;i++){
   start[styleArr[i]] += (size[styleArr[i]] - start[styleArr[i]]) * speed/100;
   style[styleArr[i]] = start[styleArr[i]] + 'px';
  }
  for(var i=0;i<styleArr.length;i++){
   if(Math.round(start[styleArr[i]]) == size[styleArr[i]]){
    if(i!=styleArr.length-1)continue;
   }else{
    break;
   }
   for(var i=0;i<styleArr.length;i++)style[styleArr[i]] = size[styleArr[i]] + 'px';
   clearInterval(element.effect.resize);
   if(callback)callback.call(element);
  }
 }, 20);
};
</script>
</head>
<body>

<div id="testDiv" style="position:absolute;right:100px;top:50px;background-color:#abc;width:100px;height:50px;padding:10px;" onclick="alert(this.style.filter)"><div style="background-color:#369;height:100%;"></div></div><br>
动画测试  
<input type="button" value="改变大小" onClick="resize('testDiv',{width:rand(60,600),height:rand(30,300)})">
<input type="button" value="改变宽度" onClick="resize('testDiv',{width:rand(60,600)})">
<input type="button" value="改变高度" onClick="resize('testDiv',{height:rand(30,300)})">
<input type="button" value="移动位置" onClick="move('testDiv',{left:rand(40,600),top:rand(40,400)})">
<input type="button" value="水平移动" onClick="move('testDiv',{left:rand(40,600)})">
<input type="button" value="垂直移动" onClick="move('testDiv',{top:rand(40,400)})">
<input type="button" value="透明度变化" onClick="fade('testDiv',rand(5,100))">
<input type="button" value="还原" onClick="var ele=document.getElementById('testDiv');clearInterval(ele.effect.move);clearInterval(ele.effect.fade);clearInterval(ele.effect.resize);ele.style.cssText='position:absolute;right:100px;top:50px;background-color:#abc;width:100px;height:50px;padding:10px;'">
</body>
</html>

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提示：可以先修改部分代码后再运行

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