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js动画2 多物体运动

2015-07-20 21:01 711 查看

速度渐变：

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>无标题文档</title>
<style>
ul,li{ list-style:none}
ul li{
width:200px;
height:100px;
background:yellow;
margin-bottom:20px;
}
</style>
<script>
window.onload = function(){
var aLi = document.getElementsByTagName('li');
for(var i =0;i<aLi.length;i++){
aLi[i].timer = null;
aLi[i].onmouseover = function(){
startMove(this,400);
}
aLi[i].onmouseout = function(){
startMove(this,200);
}
}
}
function startMove(obj,iTarget){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var 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)
}
</script>
</head>

<body>
<ul>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>

透明度渐变：

代码：

<!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>无标题文档</title>
<style>
body{
padding:0;
margin:0
}
div{
width:200px;
height:200px;
background:red;
margin:20px;
filter:alpha(opacity:30);
opacity:0.3;
float:left;
}
</style>
<script>

window.onload = function(){
var oDiv = document.getElementsByTagName('div');
for(var i=0;i<oDiv.length;i++){
oDiv[i].alpha = 30;
oDiv[i].onmouseover = function(){
startMove(this,100);
}
oDiv[i].onmouseout = function(){
startMove(this,30);
}
}
}
//var timer = null;
//var alpha = 30;
function startMove(obj,seat){
clearInterval(obj.timer);
//var oDiv = document.getElementById('div1');
obj.timer = setInterval(function(){
if(obj.alpha > seat){
speed = -10;
}
else{
speed = 10;
}
if(obj.alpha == seat){
clearInterval(obj.timer);
}
else{
obj.alpha += speed;
obj.style.filter = 'alpha(opacity:'+obj.alpha+')';
obj.style.opacity = obj.alpha/100;
}
},30)
}

</script>
</head>

<body>
<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div>
<div id="div4"></div>
</body>
</html>

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