JS实现带缓冲效果打开、关闭、移动一个层的方法

前端技术 2023/09/08 JavaScript

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。

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