这里需要鼠标点击激活的网页左上角菜单，不点击不会滑出来，可以改造成二级菜单。
运行效果截图如下：
在线演示地址如下：
具体代码如下：
<!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" content="text/html; charset=utf-8" /> <title>左上角导航菜单</title> <style type="text/css"> #divMenu0 {position:absolute; top:0px; left:30px; visibility:hidden; font-family:arial,helvetica,sans-serif; font-size:18px; font-weight:bold;} #divMenu1 {position:absolute; top:0px; left:150px; visibility:hidden; font-family:arial,helvetica,sans-serif; font-size:18px; font-weight:bold;} #divMenu2 {position:absolute; top:0px; left:250px; visibility:hidden; font-family:arial,helvetica,sans-serif; font-size:18px; font-weight:bold;} </style> <script language="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() var tMove=10; var tSpeed=40 var tMoveOnScroll=true var tShow=20 function makeMenu(obj,nest,show,move,speed){ nest=(!nest) ? "":'document.'+nest+'.' this.el=bw.dom?document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+'document.'+obj):0; this.css=bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+'document.'+obj):0; this.x=this.css.left||this.css.pixelLeft||this.el.offsetLeft||0 this.y=this.css.top||this.css.pixelTop||this.el.offsetTop||0 this.state=1; this.go=0; this.mup=b_mup; this.show=show; this.mdown=b_mdown; this.height=bw.ns4?this.css.document.height:this.el.offsetHeight this.moveIt=b_moveIt; this.move=move; this.speed=speed this.obj = obj + "Object"; eval(this.obj + "=this") } var px = bw.ns4||window.opera?"":"px"; function b_moveIt(x,y){this.x=x; this.y=y; this.css.left=this.x+px; this.css.top=this.y+px;} function b_mup(){ if(this.y>-this.height+this.show){ this.go=1; this.moveIt(this.x,this.y-this.move) setTimeout(this.obj+".mup()",this.speed) }else{this.go=0; this.state=1} } //Menu out function b_mdown(){ if(this.y<eval(scrolled)){ this.go=1; this.moveIt(this.x,this.y+this.move) setTimeout(this.obj+".mdown()",this.speed) }else{this.go=0; this.state=0} } function moveTopMenu(num){ if(!oMenu[num].go){ if(!oMenu[num].state)oMenu[num].mup() else oMenu[num].mdown() } for(i=0;i<oMenu.length;i++){ if(i!=num && !oMenu[i].state){ oMenu[i].mup()} } } function checkScrolled(){ for(i=0;i<oMenu.length;i++){ if(!oMenu[i].go){ y=!oMenu[i].state?eval(scrolled):eval(scrolled)-oMenu[i].height+oMenu[i].show oMenu[i].moveIt(oMenu[i].x,y) } } if(bw.ns4||bw.ns6) setTimeout('checkScrolled()',40) } function topMenuInit(){ oMenu=new Array() oMenu[0]=new makeMenu('divMenu0',"",tShow,tMove,tSpeed) oMenu[1]=new makeMenu('divMenu1',"",tShow,tMove,tSpeed) //* oMenu[2]=new makeMenu('divMenu2',"",20,10,20) //* scrolled=bw.ns4||bw.ns6?"window.pageYOffset":"document.body.scrollTop" for(i=0;i<oMenu.length;i++){ oMenu[i].moveIt(oMenu[i].x,-oMenu[i].height+oMenu[i].show) oMenu[i].css.visibility='visible' } if(tMoveOnScroll) bw.ns4||bw.ns6?checkScrolled():window.onscroll=checkScrolled; } onload=topMenuInit; </script> <div> <!-- You can just replace this text with some cool images if you want --> <a href="javascript://">链接一</a><br><br> <a href="javascript://">链接二</a><br><br> <a href="javascript://">链接三</a><br><br> <a href="javascript://">链接四</a><br><br> <a href="#">菜单一</a> </div> <div> <!-- You can just replace this text with some cool images if you want --> 这是第二个菜单的内容<br><br> <a href="#">菜单二</a> </div> <div> <!-- You can just replace this text with some cool images if you want --> 这是第三个菜单的内容<br> <a href="#">菜单三</a> </div> </body> </html>