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JavaScript method to control the collapsing and expanding effect of web page layer_javascript skills

WBOY
WBOYOriginal
2016-05-16 16:04:021163browse

The example in this article describes the method of using JavaScript to control the collapsing and expanding effects of the web page layer. Share it with everyone for your reference. The details are as follows: 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">  
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<title>很酷的DIV层的展开收缩效果</title>
<style>
* { margin:0; padding:0;}
body {
text-align:center;
font:75% Verdana, Arial, Helvetica, sans-serif;
}
h1 {
font:125% Arial, Helvetica, sans-serif;
text-align:left; font-weight:bolder;
background:#333; padding:3px;
display:block; color:#99CC00
}
.class1 {
width:40%; background:#CCC;
position:relative; margin:0 auto;
padding:5px;}
span { position:absolute; right:10px;
top:8px; cursor:pointer; color:yellow;
}
p { text-align:left; line-height:20px;
background:#333; padding:3px; margin-top:5px;
color:#99CC00
}
#class1content {
height:300px;overflow:hidden
}
</style>
<script>
function $(element){
return element = document.getElementById(element);
}
function $D(){
var d=$('class1content');
var h=d.offsetHeight;
var maxh=300;
function dmove(){
h+=50; //设置层展开的速度
if(h>=maxh){
d.style.height='300px';
clearInterval(iIntervalId);
}else{
d.style.display='block';
d.style.height=h+'px';
}
}
iIntervalId=setInterval(dmove,2);
}
function $D2(){
var d=$('class1content');
var h=d.offsetHeight;
var maxh=300;
function dmove(){
h-=50;//设置层收缩的速度
if(h<=0){
d.style.display='none';
clearInterval(iIntervalId);
}else{
d.style.height=h+'px';
}
}
iIntervalId=setInterval(dmove,2);
}
function $use(){
var d=$('class1content');
var sb=$('stateBut');
if(d.style.display=='none'){
$D();
sb.innerHTML='收缩';
}else{
$D2();
sb.innerHTML='展开';
}
}
</script>
</head>
<body>
<div class="class1">
<h1>DIV层的展开隐藏效果</h1>
<span id="stateBut" onclick="$use()">展开</span>
<p id="class1content">曾经有一份真诚的爱情放在我面前， 
<br>我没有珍惜，<br>等我失去的时候我才后悔莫及，
<br>人世间最痛苦的事莫过于此。
<br>如果上天能够给我一个再来一次的机会，
<br>我会对那个女孩子说三个字：<br>我爱你。
<br>如果非要在这份爱上加上一个期限，
<br>我希望是……一万年！”
</div>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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