JS实现带缓冲效果打开、关闭、移动一个层的方法

本文实例讲述了JS带缓冲效果打开、关闭、移动一个层的方法。分享给大家供大家参考。具体实现方法如下：

<!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" lang="gb2312">
<head>
<title>JavaScript缓冲打开层</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"/>
<style type="text/css">
* {
margin:0; padding:0;
}
body {
margin:5px auto; text-align:center; background:#f0f0f0;
}
#d1 {
position:absolute; top:20px;
left:20px; width:100px; height:60px;
border:1px solid #808;
}
#d2 {
position:absolute; top:100px;
left:20px; width:100px; height:60px;
border:1px solid #808;
}
#open1, #close1, #open2, #close2 {
cursor:pointer; background:#ccf; margin:5px;
}
#open1, #open2 {
display:block;
}
#close1, #close2 {
display:none;
}
</style>
</head>
<body>
<div id="d1">
移动位置
<span id="open1" onclick="fo1()">Open</span>
<span id="close1" onclick="fc1()">Close</span>
</div>
<div id="d2">
改变大小
<span id="open2" onclick="fo2()">Open</span>
<span id="close2" onclick="fc2()">Close</span>
</div>
<div id="debug">AAA</div>
<script type="text/javascript">
//<[CDATA[
var sl = 20; //初始left值
var el = 500; //结束left值
var sw = 100;//初始width值
var ew = 580;//结束width值
var p = 10; //缓冲变量
var t = 20; //时间变量
var d1 = document.getElementById('d1');
var d2 = document.getElementById('d2');
var debug = document.getElementById('debug');
var open1 = document.getElementById('open1');
var close1 = document.getElementById('close1');
var open2 = document.getElementById('open2');
var close2 = document.getElementById('close2');
function fo1() {
var cl = parseInt(getStyle(d1,'left'));
//当前left值
if (cl<el) {
d1.style.left = cl + Math.ceil((el-cl)/p) + 'px';
//当前值+缓冲增量
debug.innerHTML = getStyle(d1,'left');
//cl + 'px';
setTimeout('fo1()', t);
} else {
d1.style.left = el + 'px';
open1.style.display = 'none';
close1.style.display = 'block';
}
}
function fc1() {
var cl = parseInt(getStyle(d1,'left'));
//当前left值
if (cl>sl) {
d1.style.left = cl - Math.ceil((cl-sl)/p) + 'px';
//当前值-缓冲增量
debug.innerHTML = getStyle(d1,'left');
//cl + 'px';
setTimeout('fc1()', t);
} else {
d1.style.left = sl + 'px';
open1.style.display = 'block';
close1.style.display = 'none';
}
}
function fo2() {
var cw = parseInt(getStyle(d2,'width'));
//当前width值
if (cw<ew) {
d2.style.width = cw + Math.ceil((ew-cw)/p) + 'px';
//当前值+缓冲增量
debug.innerHTML = getStyle(d2,'width');
//cw + 'px';
setTimeout('fo2()', t);
} else {
d2.style.width = ew + 'px';
open2.style.display = 'none';
close2.style.display = 'block';
}
}
function fc2() {
var cw = parseInt(getStyle(d2,'width'));
//当前width值
if (cw>sw) {
d2.style.width = cw - Math.ceil((cw-sw)/p) + 'px';
//当前值-缓冲增量
debug.innerHTML = getStyle(d2,'width');
//cw + 'px';
setTimeout('fc2()', t);
} else {
d2.style.width = sw + 'px';
open2.style.display = 'block';
close2.style.display = 'none';
}
}
function getStyle( elem, name ) {
if (elem.style[name]) { return elem.style[name]; }
else if (elem.currentStyle) { return elem.currentStyle[name]; }
else if (document.defaultView && document.defaultView.getComputedStyle){
name = name.replace(/([A-Z])/g,"-$1");
name = name.toLowerCase();
var s = document.defaultView.getComputedStyle(elem,"");
return s && s.getPropertyValue(name);
}
else { return null; }
}
//]]>
</script>
</body>
</html>

希望本文所述对大家的javascript程序设计有所帮助。