ad_float_fullscreen.js

讲的是网络编程

brOK=navigator.javaEnabled()?true:false;
//ns4=(document.layers)?true:false;
//ie4=(document.all)?true:false;
var vmin=2; var vmax=5; var vr=2; var timer1;
function Chip(chipname,width,height){
	this.named=chipname;
	this.vx=vmin+vmax*Math.random();
	this.vy=vmin+vmax*Math.random();
	this.w=width; this.h=height;
	this.xx=0;
	this.yy=0;
	this.timer1=null;
}
function movechip(chipname) {
	if(brOK){
		eval("chip="+chipname);
		if(ns4){
			pageX=window.pageXOffset;
			pageW=window.innerWidth;
			pageY=window.pageYOffset;
			pageH=window.innerHeight;
		}
		else{
			pageX=window.document.body.scrollLeft;
			pageW=window.document.body.offsetWidth-8;
			pageY=window.document.body.scrollTop;
			pageH=window.document.body.offsetHeight;
		}
		chip.xx=chip.xx+chip.vx;chip.yy=chip.yy+chip.vy;
		chip.vx+=vr*(Math.random()-0.5);
		chip.vy+=vr*(Math.random()-0.5);
		if(chip.vx>(vmax+vmin)) chip.vx=(vmax+vmin)*2-chip.vx;
		if(chip.vx<(-vmax-vmin)) chip.vx=(-vmax-vmin)*2-chip.vx;
		if(chip.vy>(vmax+vmin)) chip.vy=(vmax+vmin)*2-chip.vy;
		if(chip.vy<(-vmax-vmin)) chip.vy=(-vmax-vmin)*2-chip.vy;
		if(chip.xx<=pageX){
			chip.xx=pageX;chip.vx=vmin+vmax*Math.random();
			}
		if(chip.xx>=pageX+pageW-chip.w){
			chip.xx=pageX+pageW-chip.w;
			chip.vx=-vmin-vmax*Math.random();
			}
		if(chip.yy<=pageY){
			chip.yy=pageY;
			chip.vy=vmin+vmax*Math.random();
			}
		if(chip.yy>=pageY+pageH-chip.h){
			chip.yy=pageY+pageH-chip.h;
			chip.vy=-vmin-vmax*Math.random();
			}
		if(ns4){
			eval('document.'+chip.named+'.top ='+chip.yy);
			eval('document.'+chip.named+'.left='+chip.xx);
			}
		else{
			eval('document.all.'+chip.named+'.style.pixelLeft='+chip.xx);
			eval('document.all.'+chip.named+'.style.pixelTop ='+chip.yy);
			}
		chip.timer1=setTimeout("movechip('"+chip.named+"')",100);
	}
}

function stopme(chipname){ 
	if(brOK){
		eval("chip="+chipname);
		if(chip.timer1!=null){
			clearTimeout(chip.timer1)
		}
	}
}
var DGbanner2;
function DGbanner2() {
	DGbanner2=new Chip("DGbanner2",60,80);
	if(brOK){
		movechip("DGbanner2");
		}
}
window.onload=DGbanner2;