JS实现slide文字框缩放伸展效果代码

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.jb51.net/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>
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    </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。