网页代码设计技巧系列之-----上下跳动的宣传图片.doc

脚本说明:把如下代码加入区域中var brOK=false;var mie=false;var aver=parseInt(navigator.appVersion.substring(0,1);var aname=navigator.appName;var mystop=0;var step=0.2;function checkbrOK()if(aname.indexOf(Internet Explorer)!=-1)if(aver=4) brOK=navigator.javaEnabled();mie=true;if(aname.indexOf(Netscape)!=-1) if(aver=4) brOK=navigator.javaEnabled();var vmin=1.5;var vmax=3;var vr=2;var timer1;function Chip(chipname,width,height)d=chipname;this.vx=vmin+vmin;this.vy=0;this.w=width;this.h=height;this.xx=0;this.yy=0;this.timer1=null;function movechip(chipname)if(brOK & mystop=0)eval(chip=+chipname);if(!mie)pageX=window.pageXOffset;pageW=window.innerWidth;pageY=window.pageYOffset;pageH=window.innerHeight;elsepageX=window.document.body.scrollLeft;pageW=window.document.body.offsetWidth-8;pageY=window.document.body.scrollTop;pageH=window.document.body.offsetHeight-4; chip.xx=chip.xx+chip.vx;chip.vy=chip.vy+step;chip.yy=chip.yy+chip.vy;if(chip.xx=pageX+pageW-85)chip.xx=pageX;chip.vx=vmin;chip.yy=pageY;chip.vy=vmin+vmax;if(chip.yy(pageY+pageH-chip.h)chip.yy=pageY+pageH-chip.h;chip.vy=-chip.vy*0.65;if(!mie)eval(document.+d+.top =+chip.yy);eval(document.+d+.left=+chip.xx); elseeval(document.all.+d+.style.pixelLeft=+chip.xx);eval(document.all.+d+.style.pixelTop =+chip.yy); chip.timer1=setTimeout(movechip(+d+),40);function stopme(flag)brOk=true;mystop=flag;movechip(tome);var tome;var chip;function tome()checkbrOK(); tome=new Chip(tome,80,80);if(brOK & mystop=0) movechip(tome);ns4=(document.layers)?true:false;ie4=(document.all)?true:false;function cncover()if(ns4)c.left=window.innerWidth/2-400;eval(c.top=document.+d+.top);c.visibility=show;stopme(1);mytime=setTimeout(cncout(),3000);else if(ie4) c.style.left=window.document.body.offsetWidth/2-200;c.style.top=parseInt(document.all.tome.style.top);c.style.visibility=visible;stopme(1);mytime=setTimeout(cncout(),3000);function cncout()clearTimeout(mytime);if(ns4)docume