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鼠标点击后层展开JavaScript_层和布局特效

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特效Tag：层展开添加

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鼠标点击后层展开JavaScript，代码稍嫌复杂，重在学习研究，有兴趣的可以修改一下。

<html>

<head>
<meta http-equiv="Content-Type" mrc="text/html; charset=gb2312">
<title>层展开折叠</title>
</head>

<body>

<style type="text/css">
DIV.clTopMenu{position:absolute; width:101; height:150; clip:rect(0,101,14,0); visibility:hidden; z-index:31; layer-background-color:#EEEEEE; background-color:#00CCFF}
DIV.clTopMenuBottom{position:absolute; width:101; height:3; clip:rect(0,101,3,0); top:11; layer-background-color:#CECFCE; background-color:#000099; z-index:2}
DIV.clTopMenuText{position:absolute; width:91; left:5; top:15; font-family:"Arial", "Helvetica", "sans-serif"; font-size:9pt; background-color:#EEEEEE; z-index:1; color: #000000} 
 
a:link {  color: #000000; text-decoration: none}
</style>
<script language="JavaScript" type="text/javascript">
function lib_bwcheck(){ //Browsercheck (needed)
	this.ver=navigator.appVersion
	this.agent=navigator.userAgent
	this.dom=document.getElementById?1:0
	this.opera5=this.agent.indexOf("Opera 5")>-1
	this.ie5=(this.ver.indexOf("MSIE 5")>-1  &&  this.dom  &&  !this.opera5)?1:0; 
	this.ie6=(this.ver.indexOf("MSIE 6")>-1  &&  this.dom  &&  !this.opera5)?1:0;
	this.ie4=(document.all  &&  !this.dom  &&  !this.opera5)?1:0;
	this.ie=this.ie4||this.ie5||this.ie6
	this.mac=this.agent.indexOf("Mac")>-1
	this.ns6=(this.dom  &&  parseInt(this.ver) >= 5) ?1:0; 
	this.ns4=(document.layers  &&  !this.dom)?1:0;
	this.bw=(this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
	return this
}
var bw=new lib_bwcheck()

nPlace=0
var nNumberOfMenus=2
var nMwidth=101 //The width on the menus (set the width in the stylesheet as well)
var nPxbetween=20 //Pixels between the menus
var nFromleft=10 //The first menus left position
var nFromtop=20 //The top position of the menus
var nBgcolor='#CECFCE' //The bgColor of the bottom mouseover div 
var nBgcolorchangeto='#6380BC' //The bgColor to change to
var nImageheight=11 //The position the mouseover line div will stop at when going up!

function makeNewsMenu(obj,nest){
	nest=(!nest) ? "":'document.'+nest+'.'					
   	this.css=bw.dom? document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+"document.layers." +obj):0;		
	this.evnt=bw.dom? document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+"document.layers." +obj):0;			
	this.scrollHeight=bw.ns4?this.css.document.height:this.evnt.offsetHeight
	this.moveIt=b_moveIt;this.bgChange=b_bgChange;
	this.slideUp=b_slideUp; this.slideDown=b_slideDown;
	this.clipTo=b_clipTo;
    this.obj = obj + "Object"; 	eval(this.obj + "=this")		
}

function b_moveIt(x,y){this.x=x; this.y=y; this.css.left=this.x; this.css.top=this.y}
function b_bgChange(color){if(bw.dom || bw.ie4) this.css.backgroundColor=color; else this.css.bgColor=color}
function b_clipTo(t,r,b,l){
	if(bw.ns4){this.css.clip.top=t; this.css.clip.right=r; this.css.clip.bottom=b; this.css.clip.left=l
	}else this.css.clip="rect("+t+","+r+","+b+","+l+")";
}
function b_slideUp(ystop,moveby,speed,fn,wh){
	if(!this.slideactive){
		if(this.y>ystop){
			this.moveIt(this.x,this.y-5); eval(wh)
			setTimeout(this.obj+".slideUp("+ystop+","+moveby+","+speed+",'"+fn+"','"+wh+"')",speed)
		}else{
			this.slideactive=false; this.moveIt(0,ystop); eval(fn)
		}
	}
}
function b_slideDown(ystop,moveby,speed,fn,wh){
	if(!this.slideactive){
		if(this.y<ystop){
			this.moveIt(this.x,this.y+5); eval(wh)
			setTimeout(this.obj+".slideDown("+ystop+","+moveby+","+speed+",'"+fn+"','"+wh+"')",speed)
		}else{
			this.slideactive=false; this.moveIt(0,ystop); eval(fn)
		}
	}
}
//Initiating the page, making cross-browser objects
function newsMenuInit(){
	oTopMenu=new Array()
	zindex=10
	for(i=0;i<=nNumberOfMenus;i++){
		oTopMenu[i]=new Array()
		oTopMenu[i][0]=new makeNewsMenu('divTopMenu'+i)
		oTopMenu[i][1]=new makeNewsMenu('divTopMenuBottom'+i,'divTopMenu'+i)
		oTopMenu[i][2]=new makeNewsMenu('divTopMenuText'+i,'divTopMenu'+i)
		oTopMenu[i][1].moveIt(0,nImageheight)
		oTopMenu[i][0].clipTo(0,nMwidth,nImageheight+3,0)
		if(!nPlace) oTopMenu[i][0].moveIt(i*nMwidth+nFromleft+(i*nPxbetween),nFromtop)
		else{
			oTopMenu[i][0].moveIt(nFromleft,i*nImageheight+nFromtop+(i*nPxbetween))
			oTopMenu[i][0].css.zIndex=zindex--
		}
		oTopMenu[i][0].css.visibility="visible"
	}
}
//Moves the menu
function topMenu(num){
	if(oTopMenu[num][1].y==nImageheight) oTopMenu[num][1].slideDown(oTopMenu[num][2].scrollHeight+20,10,40,'oTopMenu['+num+'][0].clipTo(0,nMwidth,oTopMenu['+num+'][1].y+3,0)','oTopMenu['+num+'][0].clipTo(0,nMwidth,oTopMenu['+num+'][1].y+3,0)')
	else if(oTopMenu[num][1].y==oTopMenu[num][2].scrollHeight+20) oTopMenu[num][1].slideUp(nImageheight,10,40,'oTopMenu['+num+'][0].clipTo(0,nMwidth,oTopMenu['+num+'][1].y+3,0)','oTopMenu['+num+'][0].clipTo(0,nMwidth,oTopMenu['+num+'][1].y+3,0)')
}
//Changes background onmouseover
function menuOver(num){oTopMenu[num][1].bgChange(nBgcolorchangeto)}
function menuOut(num){oTopMenu[num][1].bgChange(nBgcolor)}

//Calls the init function onload
onload=newsMenuInit;
</script>

<div id="divTopMenu0" class="clTopMenu" align="center" style="height: 170; left: 20; top: 20"><span class="css3"><a href="#" onMouseOver="menuOver(0)" onMouseOut="menuOut(0)" onClick="topMenu(0); if(bw.dom || bw.ie4)this.blur(); return false">mb5u.com</a> 
  </span> 
  <div id="divTopMenuText0" class="clTopMenuText"> <span class="css3"> 模板无忧（mb5u.com）提供各类网页模板、视频教程、JavaScript/CSS特效代码以及常用软件下载等，做有质量的学习型源码下载站。</span><font size="2"><font color="#000000">。</div>
  <div id="divTopMenuBottom0" class="clTopMenuBottom" style="top: 11; height: 10"></div>
</div>
</div>
</body>

</html>

所属频道：层和布局特效/更新时间：2012-12-20

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