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JS滑動展開層_層和布局特效

用JavaScript滑動展開一個層，可展開頂部和左側(cè)，僅供學習參考，代碼有點復雜，JS+CSS的綜合運用，需要費點勁才能看懂哦！

<!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">
<head>
<meta http-equiv="Content-Type" mrc="text/html; charset=gb2312" />
<title>滑動展開層</title>
<STYLE>
 body {
 background-color: #EEEEEE;
 margin: 0px;
 text-align: center;
 }
 #wrap {
 width: 736px;
 background-color: #FFFFFF;
 overflow: hidden;
 margin: 12px;
 padding: 12px;
 }
 #topcontainer {
 height: 80px;
 width: 732px;
 background-color: #99FF66;
 border: 1px solid #79F200;
 }
 #bodycontainer {
 height: 400px;
 width: 100%;
 margin-top: 12px;
 }
 #bottomcontainer {
 height: 60px;
 width: 100%;
 margin-top: 12px;
 }
 #topwrap {
 width: 100%;
 }
 #leftcontainer {
 background-color: #99FF66;
 height: 400px;
 width: 120px;
 float: left;
 border: 1px solid #79F200;
}
input {
 background-color: #99FF66;
 border-top-width: 1px;
 border-right-width: 1px;
 border-bottom-width: 1px;
 border-left-width: 1px;
 border-top-style: solid;
 border-right-style: solid;
 border-bottom-style: solid;
 border-left-style: solid;
 border-top-color: #79F200;
 border-right-color: #79F200;
 border-bottom-color: #79F200;
 border-left-color: #79F200;
 line-height: 28px;
 background-position: center;
 height: 30px;
}
</STYLE>
</head>
<body>
<br />
<div id="wrap">
  <div align="left" style="margin-bottom:3px">
      <input type="button" id="showtop" onclick="topslider.show();this.style.display='none';document.getElementById('hidetop').style.display='';" value="展開頂部"/>
   <input type="button" id="hidetop" value="關(guān)閉頂部" onclick="topslider.hide();this.style.display='none';document.getElementById('showtop').style.display='';" style="display:none"/>
  </div>
  <div id="topwrap">
   <div id="topcontainer" style="display:none"></div>
  </div>
  <div id="bodycontainer">
    <div id="leftcontainer" style="display:none"><br />
        <br />
        <br />
    </div>
    <div align="left">
      <input type="button" id="showleft" value="展開左側(cè)" onclick="leftslider.show();this.style.display='none';document.getElementById('hideleft').style.display='';"/>
      <input type="button" id="hideleft" value="關(guān)閉左側(cè)" onclick="leftslider.hide();this.style.display='none';document.getElementById('showleft').style.display='';" style="display:none"/>
    </div>
  </div>
  <div id="bottomcontainer"></div>
</div>
<script language="JavaScript" type="text/javascript">
slider.names = new Array();
function slider()
{
 this.id = slider.names.length;
 slider.names[this.id] = this;
 this.target  = document.getElementById(arguments[0]); //第一個參數(shù)：被操作div的id
 this.direction = arguments[1];//第二個參數(shù)：div彈出的方向
 this.height = arguments[2];//第三個參數(shù)：div的高度
 this.width = arguments[3];//第四個參數(shù)：div的寬度
 this.step = arguments[4];//第五個參數(shù)：希望動作分解為幾步完成
 this.timer = 10 * arguments[5];//第六個參數(shù)：每個動作的間隔時間，10ms為一個單位
 this.startopa = arguments[6];//第七個參數(shù)：div開始的透明度
 this.sparent = this.target.parentNode;//獲取操作div的父容器
 this.intervalid = null;//循環(huán)定時的id
 this.i = 0;//循環(huán)的計數(shù)器
 this.status = 0;//slider層的狀態(tài)：0-可以展開；1-不可以展開
 this.target.style.display = "none";//先將div隱去
 return this;
}
slider.prototype.initialize = function()
{
 this.sparent.style.overflow = "hidden";//設(shè)置父容器overflow
 this.target.style.width = Number(this.width) + 'px';//設(shè)置目標div的寬度
 this.target.style.height = Number(this.height) + 'px';//設(shè)置目標div的高度
 this.target.style.position = "";//設(shè)置目標div的定位方式
 this.target.style.display = "";//設(shè)置目標div的顯示方式
 this.target.style.filter = 'Alpha(opacity=' + Number(this.startopa) + ')';//設(shè)置目標div的透明度為初始透明度
 this.target.style.overflow = "hidden";//設(shè)置overflow
 switch(this.direction)//根據(jù)彈出方向設(shè)定div的margin
 {
  case 1://left to right
   this.target.style.marginLeft = "-" + this.width + "px";
   break;
  case 2://top to bottom
   this.target.style.marginTop = "-" + this.height + "px";
   break;
  case 3://right to left
   this.target.style.marginRight = "-" + this.width + "px";
   break;
 }
}
slider.prototype.show = function()
{
 if (this.status==0)//檢查狀態(tài)是否已經(jīng)展開
 {
  this.initialize();//操作div及其父容器的初始化
  this.intervalid = window.setInterval("slider.names["+this.id+"].cycle()",this.timer);//設(shè)置動作循環(huán)
 }
}
slider.prototype.hide = function()
{
 if (this.status==1)//檢查狀態(tài)是否已經(jīng)展開
 {
  this.intervalid = window.setInterval("slider.names["+this.id+"].decycle()",this.timer);//設(shè)置動作循環(huán)
 }
}
slider.prototype.cycle = function() //單步循環(huán)動作
{
 var opa = this.target.style.filter.split("=")[1].split(")")[0]//獲取目標div的透明度數(shù)值
 var opastep = Math.round(((100 - Number(opa)) / this.step)+2.5);//計算每步增加的透明度
 var nopa = Number(opa) + Number(opastep);//當前透明度
 if (nopa>100){this.target.style.filter = 'Alpha(opacity=100)';}else{this.target.style.filter = 'Alpha(opacity=' + String(nopa) + ')';}//給div透明度賦值
 switch(this.direction)//根據(jù)彈出方向計算和設(shè)定div的動作
 {
  case 1:  //left to right
   var opx = this.target.style.marginLeft.split("px")[0];
   var pxstep = Math.round((this.width / this.step)+0.5);
   var npx = Number(opx) + Number(pxstep);
   if (npx>0){this.target.style.marginLeft = '0px';}else{this.target.style.marginLeft = String(npx) + 'px';}
   break;
  case 2:  //top to bottom
   var opx = this.target.style.marginTop.split("px")[0];
   var pxstep = Math.round((this.height / this.step)+0.5);
   var npx = Number(opx) + Number(pxstep);
   if (npx>0){this.target.style.marginTop = '0px';}else{this.target.style.marginTop = String(npx) + 'px';}
   break;
  case 3:  //right to left
   var opx = this.target.style.marginRight.split("px")[0];
   var pxstep = Math.round((this.width / this.step)+0.5);
   var npx = Number(opx) + Number(pxstep);
   if (npx>0){this.target.style.marginRight = '0px';}else{this.target.style.marginRight = String(npx) + 'px';}
   break;
 }
 this.i++ //計數(shù)器+1
 if (this.i>(this.step-1)){window.clearInterval(this.intervalid);this.i=0;this.status=1;} //循環(huán)完畢，清除循環(huán)定時
}
slider.prototype.decycle = function() //單步循環(huán)動作
{
 var opa = this.target.style.filter.split("=")[1].split(")")[0]//獲取目標div的透明度數(shù)值
 var opastep = Math.round(((100 - Number(opa)) / this.step)+2.5)*2;//計算每步增加的透明度
 var nopa = Number(opa) - Number(opastep);//當前透明度
 if (nopa<this.startopa){this.target.style.filter = 'Alpha(opacity=' + this.startopa + ')';}else{this.target.style.filter = 'Alpha(opacity=' + String(nopa) + ')';}//給div透明度賦值
 switch(this.direction)//根據(jù)彈出方向計算和設(shè)定div的動作
 {
  case 1:  //left to right
   var opx = this.target.style.marginLeft.split("px")[0];
   var pxstep = Math.round((this.width / Math.round(this.step*0.5))+0.5);
   var npx = Number(opx) - Number(pxstep);
   if (Math.abs(npx)>this.width+2){this.target.style.marginLeft = '-' + this.width + 'px';}else{this.target.style.marginLeft = String(npx) + 'px';}
   break;
  case 2:  //top to bottom
   var opx = this.target.style.marginTop.split("px")[0];
   var pxstep = Math.round((this.height / Math.round(this.step*0.5))+0.5);
   var npx = Number(opx) - Number(pxstep);
   if (Math.abs(npx)>this.height+2){this.target.style.marginTop = '-' + this.height + 'px';}else{this.target.style.marginTop = String(npx) + 'px';}
   break;
  case 3:  //right to left
   var opx = this.target.style.marginRight.split("px")[0];
   var pxstep = Math.round((this.width / Math.round(this.step*0.5))+0.5);
   var npx = Number(opx) - Number(pxstep);
   if (Math.abs(npx)>this.width+2){this.target.style.marginRight = '-' + this.width + 'px';}else{this.target.style.marginRight = String(npx) + 'px';}
   break;
 }
 this.i++ //計數(shù)器+1
 if (this.i>(Math.round(this.step*0.5)-1)){window.clearInterval(this.intervalid);this.i=0;this.status=0;this.target.style.display = "none";} //循環(huán)完畢，清除循環(huán)定時
}
var topslider = new slider('topcontainer',2,80,734,20,2,20);
var leftslider = new slider('leftcontainer',1,398,120,20,1,20);
</script>
</body>
</html>

所屬頻道：層和布局特效/更新時間：2012-12-03

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