javascript - 雪花飘

王朝html/css/js·作者佚名  2004-06-16
窄屏简体版  字體: |||超大  

//snow.js

var snowsrc="snow.gif"

var no = 25;

var ns4up = (document.layers) ? 1 : 0;

var ie4up = (document.all) ? 1 : 0;

var ns6up = (document.getElementById&&!document.all) ? 1 : 0;

var dx, xp, yp;

var am, stx, sty;

var i, doc_width = 1024, doc_height = 768;

if (ns4up||ns6up)

{

doc_width = self.innerWidth;

doc_height = self.innerHeight;

}

else if (ie4up)

{

doc_width = document.body.clientWidth;

doc_height = document.body.clientHeight;

}

dx = new Array();

xp = new Array();

yp = new Array();

am = new Array();

stx = new Array();

sty = new Array();

for (i = 0; i < no; ++ i)

{

dx[i] = 0;

xp[i] = Math.random()*(doc_width-50);

yp[i] = Math.random()*doc_height;

am[i] = Math.random()*20;

stx[i] = 0.02 + Math.random()/10;

sty[i] = 0.7 + Math.random();

if (ns4up)

{

if (i == 0)

{

document.write("<layer name='dot"+ i +"' left='115' top='15' visibility='show'>

<img src='"+snowsrc+"' border='0'></layer>");

}

else

{

document.write("<layer name='dot"+ i +"' left='115' top='15' visibility='show'>

<img src='"+snowsrc+"' border='0'></layer>");

}

}

else if (ie4up||ns6up)

{

if (i == 0)

{

document.write("<div id='dot"+ i +"' style='POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 115px;'>

<img src='"+snowsrc+"' border='0'></div>");

}

else

{

document.write("<div id='dot"+ i +"' style='POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 115px;'>

<img src='"+snowsrc+"' border='0'></div>");

}

}

}

function snowNS()

{

for (i = 0; i < no; ++ i)

{

yp[i] += sty[i];

if (yp[i] > doc_height-50)

{

xp[i] = Math.random()*(doc_width-am[i]-30);

yp[i] = 0;

stx[i] = 0.02 + Math.random()/10;

sty[i] = 0.7 + Math.random();

doc_width = self.innerWidth;

doc_height = self.innerHeight;

}

dx[i] += stx[i];

document.layers["dot"+i].top = yp[i];

document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);

}

setTimeout("snowNS()", 40);

}

function snowIE_NS6()

{

for (i = 0; i < no; ++ i)

{

yp[i] += sty[i];

if (yp[i] > doc_height-50)

{

xp[i] = Math.random()*(doc_width-am[i]-30);

yp[i] = 0;

stx[i] = 0.02 + Math.random()/10;

sty[i] = 0.7 + Math.random();

doc_width = ns6up?self.innerWidth : document.body.clientWidth;

doc_height = ns6up?self.innerHeight : document.body.clientHeight;

}

dx[i] += stx[i];

if (ie4up)

{

document.all["dot"+i].style.pixelTop = yp[i];

document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);

}

else if (ns6up)

{

document.getElementById("dot"+i).style.top=yp[i];

document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i]);

}

}

setTimeout("snowIE_NS6()", 40);

}

if (ns4up)

{

snowNS();

}

else if (ie4up||ns6up)

{

snowIE_NS6();

}

 
 
 
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