本文实例讲述了JS实现slide文字框缩放伸展效果代码。分享给大家供大家参考，具体如下：
这里介绍的slide文字框缩放伸展效果，自己闲来无事写的，不是太好，可能在兼容性方面还需努力，展开速度方面，IE8和火狐的展开速度不一样，火狐下更快一些，至今没找到原因，也请JS高人指点江山。
运行效果截图如下：
在线演示地址如下：
http://demo.maopiaopiao.com/js/2015/js-slide-txt-dlg-show-codes/
具体代码如下：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content" content="text/html charset=gb2312">
<title>slide文字框缩放伸展效果</title>
<style type="text/css">
*{margin:0; padding:0;}
ul{list-style:none;}
.box{width:300px; margin:10px; border:1px solid #ccc; overflow:hidden; position:relative; font-size:12px;}
.oHx{height:30px; background:#eee; line-height:30px; font-size:14px; text-indent:14px; cursor:pointer;}
.fold{position:absolute; top:9px; right:12px;}
.box_content{line-height:18px; overflow:hidden; display:none;}
</style>
<script type="text/javascript">
function getElementsByClassName(className,id,tag){
tag = tag || "*";
if(id){
var id = typeof id == "string" ? $(id) : id;
}else{
var id = document.body;
}
var els = id.getElementsByTagName(tag),arr = [];
for(var i=0,n=els.length;i<n;i++){
for(var j=0,k=els[i].className.split(" "),l=k.length;j<l;j++){
if(k[j]==className){
arr.push(els[i]);
break;
}
}
}
return arr;
};
function Slide(slideClass,slideBtn,slideCon,slideSpeed) {
this.oSlides = getElementsByClassName(slideClass);
this.oTimer = null;
this.slideBtn = slideBtn;
this.slideCon = slideCon;
this.slideSpeed = slideSpeed;
}
Slide.prototype = {
oTimer:null,
_init:function (){
this._slideEvent();
},
_slideEvent:function (){
var This = this;
for(var i = 0,n=This.oSlides.length;i<n;i++){
(function(n){
var oSlide = This.oSlides[n];
var oSlideBtn = getElementsByClassName(This.slideBtn,oSlide)[0];
var oSlideCon = getElementsByClassName(This.slideCon,oSlide)[0];
oSlideBtn.onclick = function (){
if(oSlideCon.style.display == "block" && This.oTimer == null){
This._slideClose(oSlideCon);
}else if(!(oSlideCon.style.display == "block" ) && This.oTimer == null){
This._slideOpen(oSlideCon);
}
}
})(i)
}
},
_slideOpen:function (slideCon){
var This = this;
slideCon.style.display = "block";
slideCon.style.height = "auto";
var slideHeight = slideCon.offsetHeight;
slideCon.style.height = 0 + "px";
This.oTimer = setInterval(function (){
if(slideCon.offsetHeight < slideHeight){
slideCon.style.height = slideCon.offsetHeight + 2 + "px";
}else{
clearInterval(This.oTimer);
This.oTimer = null;
}
},This.slideSpeed);
},
_slideClose:function (slideCon){
var This = this;
This.oTimer = setInterval(function (){
if(slideCon.offsetHeight <= 0){
clearInterval(This.oTimer);
slideCon.style.display = "none";
This.oTimer = null;
}else{
slideCon.style.height =slideCon.offsetHeight - 2 + "px";
}
},This.slideSpeed);
}
}
</script>
</head>
<body>
<div class="box">
<div class="oHx slide">收缩2</div>
<div class="box_content">
<ul class="uft" style="padding:10px;">
<li><a href="#" target="_blank">scscms V1.0 阳光企业网站系统</a></li>
<li><a href="#" target="_blank">24点，VC++游戏源码</a></li>
<li><a href="#" target="_blank">可记录图像的C#数据库记录单程序</a></li>
<li><a href="#" target="_blank">jQuery 1.4 参考指南的实例源代码</a></li>
</ul>
</div>
</div>
<div class="box">
<div class="oHx slide">收缩3</div>
<div class="box_content">
<ul class="uft"style="padding:10px;">
<li><a href="#" target="_blank">scscms V1.0 阳光企业网站系统</a></li>
<li><a href="#" target="_blank">24点，VC++游戏源码</a></li>
<li><a href="#" target="_blank">可记录图像的C#数据库记录单程序</a></li>
<li><a href="#" target="_blank">jQuery 1.4 参考指南的实例源代码</a></li>
</ul>
</div>
</div>
<script type="text/javascript">
var mySlide = new Slide("box","slide","box_content",10);
mySlide._slideEvent();
</script>
</body>
</html>
希望本文所述对大家JavaScript程序设计有所帮助。