本文实例讲述了js实现鼠标点击左上角滑动菜单效果代码。分享给大家供大家参考。具体如下：
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：
http://demo.jb51.net/js/2015/js-click-hd-show-menu-style-codes/
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=40var tMoveOnScroll=truevar tShow=20function 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 outfunction 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 id="divMenu0"> <!-- 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="#" onclick="moveTopMenu(0); return false">菜单一</a></div><div id="divMenu1"> <!-- 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="#" onmouseover="moveTopMenu(1)">菜单二</a></div><div id="divMenu2"> <!-- 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="#" onclick="moveTopMenu(2); return false">菜单三</a></div></body></html>希望本文所述对大家的JavaScript程序设计有所帮助。
零七网部分新闻及文章转载自互联网，供读者交流和学习，若有涉及作者版权等问题请及时与我们联系，以便更正、删除或按规定办理。感谢所有提供资讯的网站，欢迎各类媒体与零七网进行文章共享合作。
