Javascript设计漫天雪花
时间：2007-02-17 来源：PHP爱好者
原代码插入到<body>下面:<script language="Javascript">
<!--
N = 40;
Y = new Array();
X = new Array();
S = new Array();
A = new Array();
B = new Array();
M = new Array();
V = (document.layers)?1:0; iH=(document.layers)?window.innerHeight:window.document.body.clientHeight;
iW=(document.layers)?window.innerWidth:window.document.body.clientWidth;
for (i=0; i <N; i++){
Y=Math.round(Math.random()*iH);
X=Math.round(Math.random()*iW);
S=Math.round(Math.random()*5+2);
A=0;
B=Math.random()*0.1+0.1;
M=Math.round(Math.random()*1+1);
}
if (V){
for (i = 0; i <N; i++)
{document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0 BGCOLOR='#FFFFF0' CLIP='0,0,"+M+","+M+"'></LAYER>")}
}
else{
document.write('<div style="position:absolute;top:0px;left:0px">');
document.write('<div style="position:relative">');
for (i = 0; i <N; i++)
{document.write('<div id="si" style="position:absolute;top:0;left:0;width:'+M+';background:#fffff0;font-size:'+M+'"></div>')}
document.write('</div></div>');
}
function snow(){
var H=(document.layers)?window.innerHeight:window.document.body.clientHeight;
var W=(document.layers)?window.innerWidth:window.document.body.clientWidth;
var T=(document.layers)?window.pageYOffset:document.body.scrollTop;
var L=(document.layers)?window.pageXOffset:document.body.scrollLeft;
for (i=0; i <N; i++){
sy=S*Math.sin(90*Math.PI/180);
sx=S*Math.cos(A);
Y+=sy;
X+=sx;
if (Y > H){
Y=-10;
X=Math.round(Math.random()*W);
M=Math.round(Math.random()*1+1);
S=Math.round(Math.random()*5+2);
}
if (V){document.layers['sn'+i].left=X;document.layers['sn'+i].top=Y+T}
else{si.style.pixelLeft=X;si.style.pixelTop=Y+T}
A+=B;
}
setTimeout('snow()',10);
}
//-->
</script>
把<body>中的内容改为：
<body bgcolor=#ffffff onLoad="snow()">
php爱好者站 http://www.phpfans.net PHP|MySQL|javascript|ajax|html.
<!--
N = 40;
Y = new Array();
X = new Array();
S = new Array();
A = new Array();
B = new Array();
M = new Array();
V = (document.layers)?1:0; iH=(document.layers)?window.innerHeight:window.document.body.clientHeight;
iW=(document.layers)?window.innerWidth:window.document.body.clientWidth;
for (i=0; i <N; i++){
Y=Math.round(Math.random()*iH);
X=Math.round(Math.random()*iW);
S=Math.round(Math.random()*5+2);
A=0;
B=Math.random()*0.1+0.1;
M=Math.round(Math.random()*1+1);
}
if (V){
for (i = 0; i <N; i++)
{document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0 BGCOLOR='#FFFFF0' CLIP='0,0,"+M+","+M+"'></LAYER>")}
}
else{
document.write('<div style="position:absolute;top:0px;left:0px">');
document.write('<div style="position:relative">');
for (i = 0; i <N; i++)
{document.write('<div id="si" style="position:absolute;top:0;left:0;width:'+M+';background:#fffff0;font-size:'+M+'"></div>')}
document.write('</div></div>');
}
function snow(){
var H=(document.layers)?window.innerHeight:window.document.body.clientHeight;
var W=(document.layers)?window.innerWidth:window.document.body.clientWidth;
var T=(document.layers)?window.pageYOffset:document.body.scrollTop;
var L=(document.layers)?window.pageXOffset:document.body.scrollLeft;
for (i=0; i <N; i++){
sy=S*Math.sin(90*Math.PI/180);
sx=S*Math.cos(A);
Y+=sy;
X+=sx;
if (Y > H){
Y=-10;
X=Math.round(Math.random()*W);
M=Math.round(Math.random()*1+1);
S=Math.round(Math.random()*5+2);
}
if (V){document.layers['sn'+i].left=X;document.layers['sn'+i].top=Y+T}
else{si.style.pixelLeft=X;si.style.pixelTop=Y+T}
A+=B;
}
setTimeout('snow()',10);
}
//-->
</script>
把<body>中的内容改为：
<body bgcolor=#ffffff onLoad="snow()">
php爱好者站 http://www.phpfans.net PHP|MySQL|javascript|ajax|html.
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