原生js动画效果(源码解析)

在做页面中,多数情况下都会遇到页面上做动画效果,大部分都是用jquery来实现动画,今天正好看到一篇原生js实现动画效果的代码,特分享在此。

原文地址:http://www.it165.net/pro/html/201410/23513.html

1、匀速动画效果

说明:匀速动画就是动画的效果从开始到结束每次执行的速度都是一致的

<!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>匀速动画</title>
<style type='text/css'>
html,body{margin:;padding:;}
div{margin:;padding:;}
.odiv{width:200px; height:200px; background:#f00; position:relative; left:-200px; top:100px;}
.sdiv{width:20px; height:60px; background:#00f; position:absolute; top:70px; right:-20px;}
</style>
</head>
<body>
<div id='odiv' class='odiv'>
<div id='sdiv' class='sdiv'>
</div>
</div>
</body>
</html>
<script language='javascript'>
window.onload = function(){
var odiv = document.getElementById('odiv');
odiv.onmouseover = function(){
startMover();
}
odiv.onmouseout = function(){
startMover(-);
}
}
var timer = null;
function startMover(itarget){//目标值
clearInterval(timer);//执行当前动画同时清除之前的动画
var odiv = document.getElementById('odiv');
timer = setInterval(function(){
var speed = ;
if(odiv.offsetLeft > itarget){
speed = -;
}
else{
speed = ;
}
if(odiv.offsetLeft == itarget){
clearInterval(timer);
}
else{
odiv.style.left = odiv.offsetLeft+speed+'px';
}
},);
}
//注明:offsetWidth = width+padding+border
//offsetHeight = height+padding+border
//offsetWidth=(border-width)*2+(padding-left)+(width)+(padding-right)
//offsetHeight=(border-width)*2+(padding-top)+(height)+(padding-bottom)
/*
offsetLeft=(offsetParent的padding-left)+(中间元素的offsetWidth)+(当前元素的margin-left)。
offsetTop=(offsetParent的padding-top)+(中间元素的offsetHeight)+(当前元素的margin-top)。
当offsetParent为body时情况比较特殊:
在IE8/9/10及Chrome中,offsetLeft = (body的margin-left)+(body的border-width)+(body的padding-left)+(当前元素的margin-left)。
在FireFox中,offsetLeft = (body的margin-left)+(body的padding-left)+(当前元素的margin-left)。
offsetParent属性返回一个对象的引用,这个对象是距离调用offsetParent的元素最近的(在包含层次中最靠近的),并且是已进行过CSS定位的容器元素。 如果这个容器元素未进行CSS定位, 则offsetParent属性的取值为根元素的引用。
总的来说两条规则:
1、如果当前元素的父级元素没有进行CSS定位(position为absolute或relative),offsetParent为body。
2、如果当前元素的父级元素中有CSS定位(position为absolute或relative),offsetParent取最近的那个父级元素。
*/
</script>

 2、缓冲动画

说明:缓冲动画就是动画到结束或这开始的时候,速度是随着动画执行的进度动态变化的

<!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>缓冲动画</title>
<style type='text/css'>
html,body{margin:;padding:;}
div{margin:;padding:;}
.odiv{width:200px; height:200px; background:#f00; position:relative; left:-200px; top:100px;}
.sdiv{width:20px; height:60px; background:#00f; position:absolute; top:70px; right:-20px;}
</style>
</head>
<body>
<div id='odiv' class='odiv'>
<div id='sdiv' class='sdiv'>
</div>
</div>
</body>
</html>
<script language='javascript'>
window.onload = function(){
var odiv = document.getElementById('odiv');
odiv.onmouseover = function(){
startMover();
}
odiv.onmouseout = function(){
startMover(-);
}
}
var timer = null;
function startMover(itarget){//速度和目标值
clearInterval(timer);//执行当前动画同时清除之前的动画
var odiv = document.getElementById('odiv');
timer = setInterval(function(){
var speed = (itarget-odiv.offsetLeft)/;//缓冲动画的速度参数变化值
//如果速度是大于0,说明是向右走,那么就向上取整
speed = speed>?Math.ceil(speed):Math.floor(speed);
//Math.floor();向下取整
if(odiv.offsetLeft == itarget){
clearInterval(timer);
}
else{
//clientLeft 返回对象的offsetLeft属性值和到当前窗口左边的真实值之间的距离
odiv.style.left = odiv.offsetLeft+speed+'px';
}
},);
}
</script>

3、透明度动画

说明:处理元素透明效果的动画

<!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>透明度动画</title>
<style type='text/css'>
html,body{margin:0;padding:0;}
div{margin:0;padding:0;}
.odiv{width:200px; height:200px; background:#f00; position:relative; left:0px; top:100px;opacity:0.3; filter:alpha(opacity:30); float:left; margin:10px;}
</style>
</head>
<body>
<div id='odiv' class='odiv'></div>
</body>
</html>
<script language='javascript'>
window.onload = function(){
var odiv = document.getElementsByTagName('div');
for(var i=0;i<odiv.length;i++)
{
odiv[i].onmouseover = function(){
startOP(this,100);
}
odiv[i].onmouseout = function(){
startOP(this,30);
}
odiv[i].timer = null;//事先定义
odiv[i].alpha = null;//事先定义
//这里发现一个问题,对象的动画属性可以不定义,但是透明度属性必须定义,否则报错
}
}
function startOP(obj,utarget){
clearInterval(obj.timer);//先关闭定时器
obj.timer = setInterval(function(){
var speed = 0;
if(obj.alpha>utarget){
speed = -10;
}
else{
speed = 10;
}
obj.alpha = obj.alpha+speed;
if(obj.alpha == utarget){
clearInterval(obj.timer);
}
obj.style.filter = 'alpha(opacity:'+obj.alpha+')';//基于IE的
obj.style.opacity = parseInt(obj.alpha)/100;
},30);
}
</script>

4、多物体动画

说明:多个物体在一起执行的动画效果

<!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>多物体动画</title>
<style type='text/css'>
body,div,dl,dt,dd,ul,ol,li,h3,h4,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,tr,td {margin:0;padding:0; font-size:12px;}
table {border-collapse:collapse;border-spacing:0;}
fieldset,img {border:0}
address,caption,cite,code,dfn,em,strong,th,var {font-style:normal;font-weight:normal}
ol,ul {list-style:none}
caption,th,td{text-align:center}
h3,h4,h3,h4,h5,h6 {font-size:100%;font-weight:normal}
q:before,q:after {content:''}
abbr,acronym { border:0}
.odiv{position:relative;}
.odiv ul li{width:200px; height:100px; background:yellow; margin-bottom:20px;}
</style>
</head>
<body>
<div id='odiv' class='odiv'>
<ul>
<li></li>
<li></li>
<li></li>
</ul>
</div>
</body>
</html>
<script language='javascript'>
window.onload = function(){
var olist = document.getElementsByTagName('li');
for(var i=0; i<olist.length;i++)
{
olist[i].onmouseover = function(){
startmov(this,400);
};
olist[i].onmouseleave = function(){
startmov(this,200);
};
olist[i].timer = null;
}
function startmov(obj,itarget){
clearInterval(obj.timer);//执行动画之前清除动画
obj.timer = setInterval(function(){
var speed =0;
speed = (itarget - obj.offsetWidth)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(obj.offsetWidth == itarget){
clearInterval(obj.timer);
}
else{
obj.style.width = obj.offsetWidth+speed+'px';
}
},30);
}
}
//offsetWidth获取的是元素实际的宽度(包括边框和内边距)
//只要是多物体运动,所有的属性都不能共用
</script>

5、获取样式动画

说明:这里的获取样式是通过计算出来元素的样式,然后通过这个计算出来的结果来操作元素

<!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>样式动画</title>
<style type='text/css'>
body,div,dl,dt,dd,ul,ol,li,h3,h4,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,tr,td {margin:0;padding:0; font-size:12px;}
table {border-collapse:collapse;border-spacing:0;}
fieldset,img {border:0}
address,caption,cite,code,dfn,em,strong,th,var {font-style:normal;font-weight:normal}
ol,ul {list-style:none}
caption,th,td{text-align:center}
h3,h4,h3,h4,h5,h6 {font-size:100%;font-weight:normal}
q:before,q:after {content:''}
abbr,acronym { border:0}
.odiv{position:relative;width:200px; height:200px; border:2px solid #000; background:red; font-size:20px;}
</style>
</head> <body>
<div id='odiv' class='odiv'>
hjshfjdfsdfhsdj
</div>
</body>
</html>
<script language='javascript'>
/*
currentStyle:获取计算后的样式,也叫当前样式、最终样式。
优点:可以获取元素的最终样式,包括<a href="http://www.it165.net/edu/ewl/" target="_blank" class="keylink">浏览器</a>的默认值,而不像style只能获取行间样式,所以更常用到。
注意:不能获取复合样式如background属性值,只能获取单一样式如background-color等。
alert (oAbc.currentStyle);
非常遗憾的是,这个好使的东西也不能被各大<a href="http://www.it165.net/edu/ewl/" target="_blank" class="keylink">浏览器</a>完美地支持。准确地说,在我测试的浏览器中,IE8和Opera 11弹出了“object CSSStyleDeclaration”;FF 12、chrome 14、safari 5则弹出“undefined”。
虽然currentStyle无法适用于所有浏览器,但是可以根据以上测试的结果来区分开支持、不支持的浏览器,然后再找到兼容的写法。
var oAbc = document.getElementById('abc');
if(oAbc.currentStyle) {
//IE、Opera
alert('我支持currentStyle');
} else {
//FF、chrome、safari
alert('我不支持currentStyle');
}
其实在FF浏览器中我们可以使用getComputedStyle(obj,false)来达到与IE下currentStyle相同的效果。
getComputedStyle(obj,false):在FF新版本中只需要第一个参数,即操作对象,第二个参数写“false”也是大家通用的写法,目的是为了兼容老版本的火狐浏览器。
兼容写法:
var oAbc = document.getElementById('abc');
if(oAbc.currentStyle) {
//IE、Opera
//alert('我支持currentStyle');
alert(oAbc.currentStyle.width);
} else {
//FF、chrome、safari
//alert('我不支持currentStyle');
alert(getComputedStyle(oAbc,false).width);
}
一个空白页面中body的id=”abc”,测试以上代码,IE和Opera弹出“auto”,其它三款浏览器则弹出“***px”。虽然结果不同,但是可以发现chrome和safari也都和火狐一样,顺利地读取到了属性值。不支持currentStyle的三款浏览器(FF、chrome、safari),都是支持getComputedStyle的。
结果表明:对浏览器是否支持currentStyle的判断 + getComputedStyle,就可以做到兼容各主流浏览器的效果。而且兼容写法并不复杂,你掌握了吗?^_^
支持currentStyle:IE、Opera
支持getComputedStyle:FireFox、Chrome、Safari
注意最后的弹出内容,currentStyle返回浏览器的默认值”auto”,而getComputedStyle则返回具体的值”**px”。这应该是两者的一个小差异,有兴趣的童鞋可以一起交流研究下。
*/
window.onload = function(){
var odiv = document.getElementById('odiv');
odiv.onmou<a href="http://www.it165.net/admin/" target="_blank" class="keylink">seo</a>ver = function(){
startMov(this);
};
function startMov(obj){
setInterval(function(){
obj.style.width = parseInt(getStyle(obj,'width'))+1+'px';
obj.style.fontSize = parseInt(getStyle(obj,'fontSize'))+1+'px';
},30);
}
function getStyle(obj,attr)
{
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
}
//offsetWidth获取的是元素实际的宽度(包括边框和内边距)
//只要是多物体运动,所有的属性都不能共用
</script>

 6、多物体复杂动画

说明:多物体复杂动画可以控制元素的不同属性变化来实现动画效果

<!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>多物体复杂动画</title>
<style type='text/css'>
body,div,dl,dt,dd,ul,ol,li,h3,h4,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,tr,td {margin:0;padding:0; font-size:12px;}
table {border-collapse:collapse;border-spacing:0;}
fieldset,img {border:0}
address,caption,cite,code,dfn,em,strong,th,var {font-style:normal;font-weight:normal}
ol,ul {list-style:none}
caption,th,td{text-align:center}
h3,h4,h3,h4,h5,h6 {font-size:100%;font-weight:normal}
q:before,q:after {content:''}
abbr,acronym { border:0}
.odiv{position:relative;}
.odiv ul li{width:200px; height:100px; background:yellow; margin-bottom:20px; border:2px solid #000;}
</style>
</head>
<body>
<div id='odiv' class='odiv'>
<ul>
<li id='li1'></li>
<li id='li2'></li>
</ul>
</div>
</body>
</html>
<script language='javascript'>
window.onload = function(){
var li1 = document.getElementById('li1');
var li2 = document.getElementById('li2');
li1.onmou<a href="http://www.it165.net/admin/" target="_blank" class="keylink">seo</a>ver = function(){
startMov(this,400,'width');
};
li1.onmouseout = function(){
startMov(this,200,'width');
};
li2.onmouseover = function(){
startMov(this,200,'height');
};
li2.onmouseout = function(){
startMov(this,100,'height');
};
function startMov(obj,itarget,attr){
clearInterval(obj.timer);//执行动画之前清除动画
obj.timer = setInterval(function(){
var icur = parseInt(getStyle(obj,attr));
var speed =0;
speed = (itarget - icur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(icur == itarget){
clearInterval(obj.timer);
}
else{
obj.style[attr] = icur+speed+'px';
}
},30);
}
function getStyle(obj,attr)
{
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
}
//offsetWidth获取的是元素实际的宽度(包括边框和内边距)
//只要是多物体运动,所有的属性都不能共用
</script>

7、多物体复杂动画(带透明度的)

<!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>多物体复杂动画(带透明度的)</title>
<style type='text/css'>
body,div,dl,dt,dd,ul,ol,li,h3,h4,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,tr,td {margin:0;padding:0; font-size:12px;}
table {border-collapse:collapse;border-spacing:0;}
fieldset,img {border:0}
address,caption,cite,code,dfn,em,strong,th,var {font-style:normal;font-weight:normal}
ol,ul {list-style:none}
caption,th,td{text-align:center}
h3,h4,h3,h4,h5,h6 {font-size:100%;font-weight:normal}
q:before,q:after {content:''}
abbr,acronym { border:0}
.odiv{position:relative;}
.odiv ul li{width:200px; height:100px; background:yellow; margin-bottom:20px; border:2px solid #000;}
#li1{opacity:0.3;filter:alpha(opacity:30);}
</style>
</head> <body>
<div id='odiv' class='odiv'>
<ul>
<li id='li1'></li>
<li id='li2'></li>
</ul>
</div>
</body>
</html>
<script language='javascript'>
window.onload = function(){
var li1 = document.getElementById('li1');
var li2 = document.getElementById('li2');
li1.onmouseover = function(){
startMov(this,100,'opacity');
};
li1.onmouseout = function(){
startMov(this,30,'opacity');
};
li2.onmouseover = function(){
startMov(this,200,'height');
};
li2.onmouseout = function(){
startMov(this,100,'height');
}
li1.timer = null;
li2.timer = null;
function startMov(obj,itarget,attr){
clearInterval(obj.timer);//执行动画之前清除动画
obj.timer = setInterval(function(){
var icur = 0;
if(attr == 'opacity'){
icur = Math.round(parseFloat(getStyle(obj,attr))*100);//转换成整数,并且四舍五入下
//计算机在计算小数的时候往往是不准确的!
}
else{
icur = parseInt(getStyle(obj,attr));
}
var speed =0;
speed = (itarget - icur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(icur == itarget){
clearInterval(obj.timer);
}
else{
if(attr == 'opacity'){
obj.style.filter = 'alpha(opacity:'+(icur+speed)+')';
obj.style.opacity = (icur+speed)/100;
}
else{
obj.style[attr] = icur+speed+'px';
}
}
},30);
}
function getStyle(obj,attr)
{
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
}
//offsetWidth获取的是元素实际的宽度(包括边框和内边距)
//只要是多物体运动,所有的属性都不能共用
</script>

8、链式动画

说明:链式动画就是当前动画执行完成后执行下一个动画效果

<!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>链式动画</title>
<style type='text/css'>
body,div,dl,dt,dd,ul,ol,li,h3,h4,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,tr,td {margin:0;padding:0; font-size:12px;}
table {border-collapse:collapse;border-spacing:0;}
fieldset,img {border:0}
address,caption,cite,code,dfn,em,strong,th,var {font-style:normal;font-weight:normal}
ol,ul {list-style:none}
caption,th,td{text-align:center}
h3,h4,h3,h4,h5,h6 {font-size:100%;font-weight:normal}
q:before,q:after {content:''}
abbr,acronym { border:0}
.odiv{position:relative;}
.odiv ul li{width:200px; height:100px; background:yellow; margin-bottom:20px; border:2px solid #000;}
#li1{opacity:0.3;filter:alpha(opacity:30);}
</style>
</head>
<body>
<div id='odiv' class='odiv'>
<ul>
<li id='li1'></li>
</ul>
</div>
</body>
</html>
<script language='javascript'>
window.onload = function(){
var li1 = document.getElementById('li1');
li1.onmouseover = function(){
startMov(li1,400,'width',function(){
startMov(li1,200,'height',function(){
startMov(li1,100,'opacity');
});
});
};
li1.onmouseout = function(){
startMov(li1,30,'opacity',function(){
startMov(li1,100,'height',function(){
startMov(li1,100,'width');
});
});
};
li1.timer = null;
function startMov(obj,itarget,attr,fn){//fn回调函数
clearInterval(obj.timer);//执行动画之前清除动画
obj.timer = setInterval(function(){
var icur = 0;
if(attr == 'opacity'){
icur = Math.round(parseFloat(getStyle(obj,attr))*100);//转换成整数,并且四舍五入下
//计算机在计算小数的时候往往是不准确的!
}
else{
icur = parseInt(getStyle(obj,attr));
}
var speed =0;
speed = (itarget - icur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(icur == itarget){
clearInterval(obj.timer);
if(fn){
fn();
}
}
else{
if(attr == 'opacity'){
obj.style.filter = 'alpha(opacity:'+(icur+speed)+')';
obj.style.opacity = (icur+speed)/100;
}
else{
obj.style[attr] = icur+speed+'px';
}
}
},30);
}
function getStyle(obj,attr)
{
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
}
//offsetWidth获取的是元素实际的宽度(包括边框和内边距)
//只要是多物体运动,所有的属性都不能共用
</script>

9、多物体同时运动动画(支持链式动画)

<!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>多物体同时运动动画</title>
<style type='text/css'>
body,div,dl,dt,dd,ul,ol,li,h3,h4,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,tr,td {margin:0;padding:0; font-size:12px;}
table {border-collapse:collapse;border-spacing:0;}
fieldset,img {border:0}
address,caption,cite,code,dfn,em,strong,th,var {font-style:normal;font-weight:normal}
ol,ul {list-style:none}
caption,th,td{text-align:center}
h3,h4,h3,h4,h5,h6 {font-size:100%;font-weight:normal}
q:before,q:after {content:''}
abbr,acronym { border:0}
.odiv{position:relative;}
.odiv ul li{width:200px; height:100px; background:yellow; margin-bottom:20px; border:2px solid #000;}
#li1{opacity:0.3;filter:alpha(opacity:30);}
</style>
</head>
<body>
<div id='odiv' class='odiv'>
<ul>
<li id='li1'></li>
</ul>
</div>
</body>
</html>
<script language='javascript'>
window.onload = function(){
var li1 = document.getElementById('li1');
li1.onmouseover = function(){
startMov(li1,{width:201,height:200,opacity:100});
};
li1.onmouseout = function(){
startMov(li1,{width:200,height:100,opacity:30});
};
li1.timer = null;
function startMov(obj,json,fn){//fn回调函数
clearInterval(obj.timer);//执行动画之前清除动画
var flag = true;//是否动画都完成了
obj.timer = setInterval(function(){
for(var attr in json){
var icur = 0;
if(attr == 'opacity'){
icur = Math.round(parseFloat(getStyle(obj,attr))*100);//转换成整数,并且四舍五入下
//计算机在计算小数的时候往往是不准确的!
}
else{
icur = parseInt(getStyle(obj,attr));
}
var speed =0;
speed = (json[attr] - icur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(icur != json[attr]){
flag = false;
}
if(attr == 'opacity'){
obj.style.filter = 'alpha(opacity:'+(icur+speed)+')';
obj.style.opacity = (icur+speed)/100;
}
else{
obj.style[attr] = icur+speed+'px';
}
if(flag){
clearInterval(obj.timer);
if(fn){
fn();
}
}
}
},30);
}
function getStyle(obj,attr)
{
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
}
//offsetWidth获取的是元素实际的宽度(包括边框和内边距)
//只要是多物体运动,所有的属性都不能共用
</script>
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