本文实例讲述了JavaScript实现鼠标点击后层展开效果的方法。分享给大家供大家参考。具体分析如下：
这段JavaScript代码可实现鼠标点击后层展开的功能，代码稍嫌复杂，重在学习研究，有兴趣的可以修改简化一下。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<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"Opera 5")>-1
this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)"MSIE 6")>-1 && this.dom && !this.opera5)"Mac")>-1
this.ns6=(this.dom && parseInt(this.ver) >= 5) "":'document.'+nest+'.'
this.css=bw.dom"document.layers." +obj):0;
this.evnt=bw.dom"document.layers." +obj):0;
this.scrollHeight=bw.ns4"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)
}
}
}
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"
}
}
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)')
}
function menuOver(num){oTopMenu[num][1].bgChange(nBgcolorchangeto)}
function menuOut(num){oTopMenu[num][1].bgChange(nBgcolor)}
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">点击展开</a>
</span>
<div id="divTopMenuText0" class="clTopMenuText">
<span class="css3">
鼠标点击后层展开JavaScript鼠标点击后层展开JavaScript。
</span>
</div>
<div id="divTopMenuBottom0" class="clTopMenuBottom" style="top: 11; height: 10"></div>
</div>
</div>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。
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