常用js特效之左上角菜单

来源：互联网发布：数据可视化软件 ta 编辑：程序博客网时间：2024/05/16 15:54
代码

<!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" xml:lang="en"><head>    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">    <title>Document</title></head><body>     <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" 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()//How many pixels should it move every step? var tMove=10;//At what speed (in milliseconds, lower value is more speed)var tSpeed=40//Do you want it to move with the page if the user scroll the page?var tMoveOnScroll=true//How much of the menu should be visible in the in state?var tShow=20/********************************************************************Contructs the menuobjects -Object functions*********************************************************************/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")    }// A unit of measure that will be added when setting the position of a layer.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;}//Menu infunction 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}  }/********************************************************************************Deciding what way to move the menu (this is called onmouseover, onmouseout or onclick)********************************************************************************/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()}    }}/********************************************************************************Checking if the page is scrolled, if it is move the menu after********************************************************************************/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)}/********************************************************************************Inits the page, makes the menu object, moves it to the right place, show it********************************************************************************/function topMenuInit(){    oMenu=new Array()    oMenu[0]=new makeMenu('divMenu0',"",tShow,tMove,tSpeed)     oMenu[1]=new makeMenu('divMenu1',"",tShow,tMove,tSpeed) //*    //Here's an example of how you can set the properties for each menu: //*    oMenu[2]=new makeMenu('divMenu2',"",20,10,20) //*    //You can add as many menus you want like the line above.    //Just remember to add the actual divs in the style and body as well.    scrolled=bw.ns4||bw.ns6?"window.pageYOffset":"document.body.scrollTop"    //Placing and showing menus    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;}//Initing menu on pageloadonload=topMenuInit;</script><div id="divMenu0">    <a href="javascript://">子菜单1-1</a><br><br>    <a href="javascript://">子菜单1-2</a><br><br>    <a href="javascript://">子菜单1-3</a><br><br>    <a href="javascript://">子菜单1-4</a><br><br>    <a href="#" onclick="moveTopMenu(0); return false">菜单1</a></div><div id="divMenu1">    这是第2个菜单的内容<br><br>    <a href="#" onmouseover="moveTopMenu(1)">菜单2</a></div><div id="divMenu2">    这是第3个菜单的内容<br>    <a href="#" onclick="moveTopMenu(2); return false">菜单3</a></div></body></html>
效果图：
这里写图片描述
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