第一步：在<head></head>之间加入以下代码：
<SCRIPT LANGUAGE="JavaScript">
if(!window.JSFX)
JSFX=new Object();
JSFX.layerNo=0;
JSFX.createElem = function(htmlStr)
{
var elem = null;
if(document.layers)
{
elem=new Layer(2000);
elem.document.open();
elem.document.write(htmlStr);
elem.document.close();
elem.innerHTML = htmlStr;
}
else
if(document.all)
{
var xName = "xLayer" + JSFX.layerNo++;
var txt = "<DIV ID='" + xName
+ "' STYLE=\"position:absolute;"
+ "visibility:hidden\">"
+ htmlStr
+ "</DIV>";
document.body.insertAdjacentHTML("BeforeEnd",txt);
elem = document.all[xName];
}
else
if (document.getElementById)
{
var xName="xLayer" + JSFX.layerNo++;
var txt = ""
+ "position:absolute;"
+ "visibility:hidden";
var newRange = document.createRange();
elem = document.createElement("DIV");
elem.setAttribute("style",txt);
elem.setAttribute("id", xName);
document.body.appendChild(elem);
newRange.setStartBefore(elem);
strFrag = newRange.createContextualFragment(htmlStr);
elem.appendChild(strFrag);
}
return elem;
}
JSFX.Layer = function(newLayer)
{
if(!newLayer)
return;
if(typeof newLayer == "string")
this.elem = JSFX.createElem(newLayer);
else
this.elem=newLayer;
if(document.layers)
{
this.images=this.elem.document.images;
this.style = this.elem;
}
else
{
this.images = document.images;
this.style = this.elem.style;
}
}
var ns4 = (navigator.appName.indexOf("Netscape") != -1 && !document.getElementById);
JSFX.Layer.prototype.moveTo = function(x,y)
{
this.style.left = x+"px";
this.style.top = y+"px";
}
if(ns4)
JSFX.Layer.prototype.moveTo = function(x,y) { this.elem.moveTo(x,y); }
JSFX.Layer.prototype.show = function() { this.style.visibility = "visible"; }
JSFX.Layer.prototype.hide = function() { this.style.visibility = "hidden"; }
if(ns4)
{
JSFX.Layer.prototype.show = function() { this.style.visibility = "show"; }
JSFX.Layer.prototype.hide = function() { this.style.visibility = "hide"; }
}
if(document.all)
{
JSFX.Layer.prototype.setOpacity = function(pc)
{
if(this.style.filter=="")
this.style.filter="alpha(opacity=100);";
this.elem.filters.alpha.opacity=pc;
}
}
else
JSFX.Layer.prototype.setOpacity = function(pc) {return 0;}
JSFX.Browser = new Object();
if(navigator.appName.indexOf("Netscape") != -1)
{
JSFX.Browser.getCanvasWidth = function() {return innerWidth;}
JSFX.Browser.getCanvasHeight = function() {return innerHeight;}
JSFX.Browser.getMinX = function() {return(pageXOffset);}
JSFX.Browser.getMinY = function() {return(pageYOffset);}
JSFX.Browser.getMaxX = function() {return(pageXOffset+innerWidth);}
JSFX.Browser.getMaxY = function() {return(pageYOffset+innerHeight);}
}
else if(document.all)
{
JSFX.Browser.getCanvasWidth = function() {return document.body.clientWidth;}
JSFX.Browser.getCanvasHeight = function() {return document.body.clientHeight;}
JSFX.Browser.getMinX = function() {return(document.body.scrollLeft);}
JSFX.Browser.getMinY = function() {return(document.body.scrollTop);}
JSFX.Browser.getMaxX = function() {
return(document.body.scrollLeft
+document.body.clientWidth);
}
JSFX.Browser.getMaxY = function() {
return(document.body.scrollTop
+document.body.clientHeight);
}
}
JSFX.Halloween = new Object();
JSFX.Halloween.Ghosts = new Array();
JSFX.Halloween.start = function()
{
if(JSFX.Halloween.theTimer == null)
{
JSFX.Halloween.theTimer = setTimeout("JSFX.Halloween.animateAll()", 40);
}
}
JSFX.Halloween.animateAll = function()
{
JSFX.Halloween.theTimer = setTimeout("JSFX.Halloween.animateAll()", 40);
var sp = JSFX.Halloween.Ghosts;
var i;
for(i=0 ; i<sp.length ; i++)
{
sp[i].animate();
}
}
JSFX.AddGhost = function(img)
{
var myGhost = null;
var htmlStr = "<IMG SRC='"+img+"'>";
myGhost = new JSFX.Layer(htmlStr);
myGhost.op = 0;
myGhost.x = Math.random()*JSFX.Browser.getMaxX();
myGhost.y = Math.random()*JSFX.Browser.getMaxY();
myGhost.dx = 0;
myGhost.dy = 0;
myGhost.w = 30;
myGhost.h = 30;
myGhost.targetX = Math.random()*JSFX.Browser.getMaxX();
myGhost.targetY = Math.random()*JSFX.Browser.getMaxY();
myGhost.state = "off"
myGhost.animate = JSFX.animateGhosts;
myGhost.hide();
myGhost.setOpacity(this.op);
myGhost.moveTo(myGhost.x,myGhost.y);
JSFX.Halloween.Ghosts[JSFX.Halloween.Ghosts.length] = myGhost;
JSFX.Halloween.start();
}
JSFX.animateGhosts = function()
{
if(this.state == "off")
{
if(Math.random() > .99)
{
this.state="up";
this.show();
}
}
else if(this.state == "on")
{
if(Math.random() > .98)
this.state="down";
}
else if(this.state == "up")
{
this.op += 2;
this.setOpacity(this.op);
if(this.op==100)
this.state = "on";
}
else if(this.state == "down")
{
this.op -= 2;
if(this.op==0)
{
this.hide();
this.state = "off";
}
else
this.setOpacity(this.op);
}
m = this;
var X = (this.targetX - m.x);
var Y = (this.targetY - m.y);
var len = Math.sqrt(X*X+Y*Y);
if(len < 1) len = 1;
var dx = 20 * (X/len);
var dy = 20 * (Y/len);
var ddx = (dx - this.dx)/10;
var ddy = (dy - this.dy)/10;
this.dx += ddx;
this.dy += ddy;
m.x += this.dx;
m.y += this.dy;
m.moveTo(m.x, m.y);
if(Math.random() >.95 )
{
this.targetX = Math.random()*(JSFX.Browser.getCanvasWidth()-150);
this.targetY = Math.random()*(JSFX.Browser.getCanvasHeight()+JSFX.Browser.getMinY()-150);
}
}
</SCRIPT>
<SCRIPT LANGUAGE="JavaScript">
function JSFX_StartEffects()
{
if (!document.all&&!document.layers)
return
JSFX.AddGhost("img/giu.gif");
JSFX.AddGhost("img/giu4.gif");
JSFX.AddGhost("img/giu2.gif");
JSFX.AddGhost("img/giu1.gif");
JSFX.AddGhost("img/giu5.gif");
}
</SCRIPT>
第二步：在<body>中加入以下代码：
onLoad="JSFX_StartEffects()"
即：<body onLoad="JSFX_StartEffects()">
减小字体
增大字体
