javascript缓冲运动代码实例
分类：实例代码
本章节分享一段代码实例，它实现了缓冲运动效果。
在编码中，匀速运动是比较简单的，但是在某些效果中并不够人性化。
而缓冲运动比较平滑，用户感受也就比较好，下面就是一段这方面的简单代码实例。
代码如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.pipipi.net/" />
<title>前端教程网</title>
<style>
body, ul, li{
margin:0;
padding 0;
}
#runs li{
width:80px;
height:80px;
background:#06c;
list-style:none;
margin:10px;
border:1px solid #000;
filter:alpha(opacity=30);
opacity:0.3;
}
</style>
<script>
window.onload = function(){
var runs = document.getElementById("runs");
var runs_li = runs.getElementsByTagName("li");
runs_li[0].onmouseover = function(){
startrun(this,"width",300);
}
runs_li[0].onmouseout = function(){
startrun(this,"width",80);
}
runs_li[1].onmouseover = function(){
startrun(this,"height",300);
}
runs_li[1].onmouseout = function(){
startrun(this,"height",80);
}
runs_li[2].onmouseover = function(){
startrun(this,"fontSize",50);
}
runs_li[2].onmouseout = function(){
startrun(this,"fontSize",14);
}
runs_li[3].onmouseover = function(){
startrun(this,"opacity",100);
}
runs_li[3].onmouseout = function(){
startrun(this,"opacity",30);
}
}
function startrun(obj,attr,target){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var cur = 0;
if(attr == "opacity"){
cur = Math.round(parseFloat(getstyle(obj,attr))*100);
}
else{
cur = parseInt(getstyle(obj,attr));
}
var speed = (target - cur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(cur == target){
clearInterval(obj.timer);
}
else{
if(attr == "opacity"){
obj.style.filter='alpha(opacity='+(cur+speed)+')';
obj.style.opacity=(cur+speed)/100;
}
else{
obj.style = cur+speed+"px";
}
}
},30);
}
function getstyle(obj,name){
if(obj.currentStyle){
return obj.currentStyle[name];
}
else{
return getComputedStyle(obj,false)[name];
}
}
</script>
</head>
<body>
<ul id="runs">
<li style="top:0">1</li>
<li style="top:90px;">2</li>
<li style="top:180px;">3</li>
<li style="top:270px;">4</li>
</ul>
</body>
</html>
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