全屏雪景效果_背景按钮特效

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全屏雪景效果

把如下代码复制到<head>与</head>之间

Amount=20; //Smoothness! depends on image file size, the smaller the size the more you can use!

//Pre-load your image below!
Image0=new Image();
Image0.src="photo/flake1.gif";
Image1=new Image();
Image1.src="photo/flake2.gif";
Image2=new Image();
Image2.src="photo/flake3.gif";
Image3=new Image();
Image3.src="photo/flake4.gif";
Image4=new Image();
Image4.src="photo/flake5.gif";

grphcs=new Array(5)
grphcs[0]="photo/flake1.gif"
grphcs[1]="photo/flake2.gif"
grphcs[2]="photo/flake3.gif"
grphcs[3]="photo/flake4.gif"
grphcs[4]="photo/flake5.gif"

Ypos=new Array();
Xpos=new Array();
Speed=new Array();
Step=new Array();
Cstep=new Array();
ns=(document.layers)?1:0;
if (ns){
for (i = 0; i < Amount; i++){
var P=Math.floor(Math.random()*grphcs.length);
rndPic=grphcs[P];
document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0><img src="+rndPic+"></LAYER>");
}
}
else{
document.write('<div style="position:absolute;top:0px;left:0px"><div style="position:relative">');
for (i = 0; i < Amount; i++){
var P=Math.floor(Math.random()*grphcs.length);
rndPic=grphcs[P];
document.write('<img id="si" src="'+rndPic+'" style="position:absolute;top:0px;left:0px">');
}
document.write('</div></div>');
}
WinHeight=(document.layers)?window.innerHeight:window.document.body.clientHeight;
WinWidth=(document.layers)?window.innerWidth:window.document.body.clientWidth;
for (i=0; i < Amount; i++){                                                                
 Ypos[i] = Math.round(Math.random()*WinHeight);
 Xpos[i] = Math.round(Math.random()*WinWidth);
 Speed[i]= Math.random()*3+2;
 Cstep[i]=0;
 Step[i]=Math.random()*0.1+0.05;
}
function fall(){
var WinHeight=(document.layers)?window.innerHeight:window.document.body.clientHeight;
var WinWidth=(document.layers)?window.innerWidth:window.document.body.clientWidth;
var hscrll=(document.layers)?window.pageYOffset:document.body.scrollTop;
var wscrll=(document.layers)?window.pageXOffset:document.body.scrollLeft;
for (i=0; i < Amount; i++){
sy = Speed[i]*Math.sin(90*Math.PI/180);
sx = Speed[i]*Math.cos(Cstep[i]);
Ypos[i]+=sy;
Xpos[i]+=sx; 
if (Ypos[i] > WinHeight){
Ypos[i]=-60;
Xpos[i]=Math.round(Math.random()*WinWidth);
Speed[i]=Math.random()*5+2;
}
if (ns){
document.layers['sn'+i].left=Xpos[i];
document.layers['sn'+i].top=Ypos[i]+hscrll;
}
else{
si[i].style.pixelLeft=Xpos[i];
si[i].style.pixelTop=Ypos[i]+hscrll;
} 
Cstep[i]+=Step[i];
}
setTimeout('fall()',10);
}
fall();
//-->
</script>

该特效所使用的图片，点击下载

使用说明：代码中的image1至image4、grphcs[0]至grphcs[4]为雪景所使用的图片，下载图片后解压到网页的同一目录即可，也可以使用你喜欢的图片作为背景。

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