 | Một mẫu hiệu ứng Javascript tuyết rơi cực đẹp dành cho các bạn muốn tô điểm trang web hay blog của mình trong dịp giáng sinh 2015. Code dễ sử dụng, dễ tích hợp vào website. |
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<script type="text/javascript" src="file:///E:/Project/DesignWeb/Effect/Tuyet_Roi/Demo/snow.js"></script>
Source snow.js:
var snowStorm = null;
function SnowStorm() {
// PROPERTIES
// ------------------
var imagePath = 'http://vnlives.net/VN-Lives/Blog/Demo/snow/'; // relative path to snow images (including trailing slash)
var flakesMax = 45;
var flakesMaxActive = 45;
var vMaxX = 2;
var vMaxY = 2;
var usePNG = false;
var flakeBottom = null; // Integer for fixed bottom, 0 or null for "full-screen" snow effect
var snowStick = false;
var snowCollect = false;
var targetElement = null; // element which snow will be appended to (document body if undefined)
var followMouse = true;
var flakeTypes = 4;
var flakeWidth = 6;
var flakeHeight = 6;
// ------------------
var zIndex = 0; // CSS stacking order applied to each snowflake
var flakeLeftOffset = 0; // amount to subtract from edges of container
var flakeRightOffset = 0; // amount to subtract from edges of container
// --- End of user section ---
var addEvent = function(o,evtName,evtHandler) {
typeof(attachEvent)=='undefined'?o.addEventListener(evtName,evtHandler,false):o.attachEvent('on'+evtName,evtHandler);
}
var removeEvent = function(o,evtName,evtHandler) {
typeof(attachEvent)=='undefined'?o.removeEventListener(evtName,evtHandler,false):o.detachEvent('on'+evtName,evtHandler);
}
var classContains = function(o,cStr) {
return (typeof(o.className)!='undefined'?o.className.indexOf(cStr)+1:false);
}
var s = this;
var storm = this;
this.timers = [];
this.flakes = [];
this.disabled = false;
this.terrain = [];
this.active = false;
var isIE = navigator.userAgent.match(/msie/i);
var isIE6 = navigator.userAgent.match(/msie 6/i);
var isOldIE = (isIE && (isIE6 || navigator.userAgent.match(/msie 5/i)));
var isWin9X = navigator.appVersion.match(/windows 98/i);
var isiPhone = navigator.userAgent.match(/iphone/i);
var isOpera = navigator.userAgent.match(/opera/i);
if (isOpera) isIE = false; // Opera (which may be sneaky, pretending to be IE by default)
var screenX = null;
var screenX2 = null;
var screenY = null;
var scrollY = null;
var vRndX = null;
var vRndY = null;
var windOffset = 1;
var windMultiplier = 2;
var pngSupported = (!isIE || (isIE && !isIE6 && !isOldIE)); // IE <7 doesn't do PNG nicely without crap filters
var docFrag = document.createDocumentFragment();
this.oControl = null; // toggle element
if (flakeLeftOffset == null) flakeLeftOffset = 0;
if (flakeRightOffset == null) flakeRightOffset = 0;
function rnd(n,min) {
if (isNaN(min)) min = 0;
return (Math.random()*n)+min;
}
this.randomizeWind = function() {
vRndX = plusMinus(rnd(vMaxX,0.2));
vRndY = rnd(vMaxY,0.2);
if (this.flakes) {
for (var i=0; i<this.flakes.length; i++) {
if (this.flakes[i].active) this.flakes[i].setVelocities();
}
}
}
function plusMinus(n) {
return (parseInt(rnd(2))==1?n*-1:n);
}
this.scrollHandler = function() {
// "attach" snowflakes to bottom of window if no absolute bottom value was given
scrollY = (flakeBottom?0:parseInt(window.scrollY||document.documentElement.scrollTop||document.body.scrollTop));
if (isNaN(scrollY)) scrollY = 0; // Netscape 6 scroll fix
if (!flakeBottom && s.flakes) {
for (var i=0; i<s.flakes.length; i++) {
if (s.flakes[i].active == 0) s.flakes[i].stick();
}
}
}
this.resizeHandler = function() {
if (window.innerWidth || window.innerHeight) {
screenX = window.innerWidth-(!isIE?16:2)-flakeRightOffset;
screenY = (flakeBottom?flakeBottom:window.innerHeight);
} else {
screenX = (document.documentElement.clientWidth||document.body.clientWidth||document.body.scrollWidth)-(!isIE?8:0)-flakeRightOffset;
screenY = flakeBottom?flakeBottom:(document.documentElement.clientHeight||document.body.clientHeight||document.body.scrollHeight);
}
screenX2 = parseInt(screenX/2);
}
this.resizeHandlerAlt = function() {
screenX = targetElement.offsetLeft+targetElement.offsetWidth-flakeRightOffset;
screenY = flakeBottom?flakeBottom:targetElement.offsetTop+targetElement.offsetHeight;
screenX2 = parseInt(screenX/2);
}
this.freeze = function() {
// pause animation
if (!s.disabled) {
s.disabled = 1;
} else {
return false;
}
for (var i=0; i<s.timers.length; i++) {
clearInterval(s.timers[i]);
}
}
this.resume = function() {
if (s.disabled) {
s.disabled = 0;
} else {
return false;
}
s.timerInit();
}
this.toggleSnow = function() {
if (!s.flakes.length) {
// first run
s.start();
s.setControlActive(true);
} else {
s.active = !s.active;
if (s.active) {
s.show();
s.resume();
s.setControlActive(true);
} else {
s.stop();
s.freeze();
s.setControlActive(false);
}
}
}
this.setControlActive = function(bActive) {
// Y.D[(bActive?'addClass':'removeClass')](s.oControl,'active');
}
this.stop = function() {
this.freeze();
for (var i=this.flakes.length; i--;) {
this.flakes[i].o.style.display = 'none';
}
removeEvent(window,'scroll',s.scrollHandler);
removeEvent(window,'resize',s.resizeHandler);
if (!isIE) {
removeEvent(window,'blur',s.freeze);
removeEvent(window,'focus',s.resume);
}
// removeEventHandler(window,'resize',this.resizeHandler,false);
}
this.show = function() {
for (var i=this.flakes.length; i--;) {
this.flakes[i].o.style.display = 'block';
}
}
this.SnowFlake = function(parent,type,x,y) {
var s = this;
var storm = parent;
this.type = type;
this.x = x||parseInt(rnd(screenX-20));
this.y = (!isNaN(y)?y:-rnd(screenY)-12);
this.vX = null;
this.vY = null;
this.vAmpTypes = [2.0,1.0,1.25,1.0,1.5,1.75]; // "amplification" for vX/vY (based on flake size/type)
this.vAmp = this.vAmpTypes[this.type];
this.active = 1;
this.o = document.createElement('img');
this.o.style.position = 'absolute';
this.o.style.width = flakeWidth+'px';
this.o.style.height = flakeHeight+'px';
this.o.style.fontSize = '1px'; // so IE keeps proper size
this.o.style.zIndex = zIndex;
this.o.src = imagePath+this.type+(pngSupported && usePNG?'.png':'.gif');
docFrag.appendChild(this.o);
this.refresh = function() {
s.o.style.left = s.x+'px';
s.o.style.top = s.y+'px';
}
this.stick = function() {
if (isIE6 || isiPhone || (targetElement != document.documentElement && targetElement != document.body)) {
s.o.style.top = (screenY+scrollY-flakeHeight-storm.terrain[Math.floor(s.x)])+'px';
} else {
s.o.style.display = 'none';
s.o.style.top = 'auto';
s.o.style.bottom = '0px';
s.o.style.position = 'fixed';
s.o.style.display = 'block';
}
}
this.vCheck = function() {
if (s.vX>=0 && s.vX<0.2) {
s.vX = 0.2;
} else if (s.vX<0 && s.vX>-0.2) {
s.vX = -0.2;
}
if (s.vY>=0 && s.vY<0.2) {
s.vY = 0.2;
}
}
this.move = function() {
s.x += s.vX*windOffset;
s.y += (s.vY*s.vAmp);
s.refresh();
if (s.vX && screenX-s.x<flakeWidth+(s.vX*windOffset)) { // X-axis scroll check
s.x = 0;
} else if ((s.vX<0 || windOffset<0)&& s.x-flakeLeftOffset<0-flakeWidth) {
s.x = screenX-flakeWidth; // flakeWidth;
}
var yDiff = screenY+scrollY-s.y-storm.terrain[Math.floor(s.x)];
if (yDiff<flakeHeight) {
s.active = 0;
if (snowCollect && snowStick) {
var height = [0.75,1.5,0.75];
for (var i=0; i<2; i++) {
storm.terrain[Math.floor(s.x)+i+2] += height[i];
}
}
s.o.style.left = (s.x/screenX*100)+'%'; // set "relative" left (change with resize)
if (!flakeBottom) {
if (snowStick) {
s.stick();
} else {
s.recycle();
}
}
}
}
this.animate = function() {
// main animation loop
// move, check status, die etc.
s.move();
}
this.setVelocities = function() {
s.vX = vRndX+rnd(vMaxX*0.12,0.1);
s.vY = vRndY+rnd(vMaxY*0.12,0.1);
}
this.recycle = function() {
s.o.style.display = 'none';
s.o.style.position = 'absolute';
s.o.style.bottom = 'auto';
s.setVelocities();
s.vCheck();
s.x = parseInt(rnd(screenX-flakeWidth-20));
s.y = parseInt(rnd(screenY)*-1)-flakeHeight;
s.o.style.left = s.x+'px';
s.o.style.top = s.y+'px';
s.o.style.display = 'block';
s.active = 1;
}
this.recycle(); // set up x/y coords etc.
this.refresh();
}
this.snow = function() {
var active = 0;
var used = 0;
var waiting = 0;
for (var i=s.flakes.length; i--;) {
if (s.flakes[i].active == 1) {
s.flakes[i].move();
active++;
} else if (s.flakes[i].active == 0) {
used++;
} else {
waiting++;
}
}
if (snowCollect && !waiting) { // !active && !waiting
// create another batch of snow
s.createSnow(flakesMaxActive,true);
}
if (active<flakesMaxActive) {
with (s.flakes[parseInt(rnd(s.flakes.length))]) {
if (!snowCollect && active == 0) {
recycle();
} else if (active == -1) {
active = 1;
}
}
}
}
this.mouseMove = function(e) {
if (!followMouse) return true;
var x = parseInt(e.clientX);
if (x<screenX2) {
windOffset = -windMultiplier+(x/screenX2*windMultiplier);
} else {
x -= screenX2;
windOffset = (x/screenX2)*windMultiplier;
}
}
this.createSnow = function(limit,allowInactive) {
for (var i=0; i<limit; i++) {
s.flakes[s.flakes.length] = new s.SnowFlake(s,parseInt(rnd(flakeTypes)));
if (allowInactive || i>flakesMaxActive) s.flakes[s.flakes.length-1].active = -1;
}
targetElement.appendChild(docFrag);
}
this.timerInit = function() {
s.timers = (!isWin9X?[setInterval(s.snow,20)]:[setInterval(s.snow,75),setInterval(s.snow,25)]);
}
this.init = function() {
for (var i=0; i<2048; i++) {
s.terrain[i] = 0;
}
s.randomizeWind();
s.createSnow(snowCollect?flakesMaxActive:flakesMaxActive*2); // create initial batch
addEvent(window,'resize',s.resizeHandler);
addEvent(window,'scroll',s.scrollHandler);
if (!isIE) {
addEvent(window,'blur',s.freeze);
addEvent(window,'focus',s.resume);
}
s.resizeHandler();
s.scrollHandler();
if (followMouse) {
addEvent(document,'mousemove',s.mouseMove);
}
s.timerInit();
}
var didInit = false;
this.start = function(bFromOnLoad) {
if (!didInit) {
didInit = true;
} else if (bFromOnLoad) {
// already loaded and running
return true;
}
if (typeof targetElement == 'string') {
targetElement = document.getElementById(targetElement);
if (!targetElement) throw new Error('Snowstorm: Unable to get targetElement');
}
if (!targetElement) {
targetElement = (!isIE?(document.documentElement?document.documentElement:document.body):document.body);
}
if (targetElement != document.documentElement && targetElement != document.body) s.resizeHandler = s.resizeHandlerAlt; // re-map handler to get element instead of screen dimensions
s.resizeHandler(); // get bounding box elements
if (screenX && screenY && !s.disabled) {
s.init();
s.active = true;
}
}
if (document.addEventListener) {
// safari 3.0.4 doesn't do DOMContentLoaded, maybe others - use a fallback to be safe.
document.addEventListener('DOMContentLoaded',function(){s.start(true)},false);
window.addEventListener('load',function(){s.start(true)},false);
} else {
addEvent(window,'load',function(){s.start(true)});
}
}
snowStorm = new SnowStorm();
function SnowStorm() {
// PROPERTIES
// ------------------
var imagePath = 'http://vnlives.net/VN-Lives/Blog/Demo/snow/'; // relative path to snow images (including trailing slash)
var flakesMax = 45;
var flakesMaxActive = 45;
var vMaxX = 2;
var vMaxY = 2;
var usePNG = false;
var flakeBottom = null; // Integer for fixed bottom, 0 or null for "full-screen" snow effect
var snowStick = false;
var snowCollect = false;
var targetElement = null; // element which snow will be appended to (document body if undefined)
var followMouse = true;
var flakeTypes = 4;
var flakeWidth = 6;
var flakeHeight = 6;
// ------------------
var zIndex = 0; // CSS stacking order applied to each snowflake
var flakeLeftOffset = 0; // amount to subtract from edges of container
var flakeRightOffset = 0; // amount to subtract from edges of container
// --- End of user section ---
var addEvent = function(o,evtName,evtHandler) {
typeof(attachEvent)=='undefined'?o.addEventListener(evtName,evtHandler,false):o.attachEvent('on'+evtName,evtHandler);
}
var removeEvent = function(o,evtName,evtHandler) {
typeof(attachEvent)=='undefined'?o.removeEventListener(evtName,evtHandler,false):o.detachEvent('on'+evtName,evtHandler);
}
var classContains = function(o,cStr) {
return (typeof(o.className)!='undefined'?o.className.indexOf(cStr)+1:false);
}
var s = this;
var storm = this;
this.timers = [];
this.flakes = [];
this.disabled = false;
this.terrain = [];
this.active = false;
var isIE = navigator.userAgent.match(/msie/i);
var isIE6 = navigator.userAgent.match(/msie 6/i);
var isOldIE = (isIE && (isIE6 || navigator.userAgent.match(/msie 5/i)));
var isWin9X = navigator.appVersion.match(/windows 98/i);
var isiPhone = navigator.userAgent.match(/iphone/i);
var isOpera = navigator.userAgent.match(/opera/i);
if (isOpera) isIE = false; // Opera (which may be sneaky, pretending to be IE by default)
var screenX = null;
var screenX2 = null;
var screenY = null;
var scrollY = null;
var vRndX = null;
var vRndY = null;
var windOffset = 1;
var windMultiplier = 2;
var pngSupported = (!isIE || (isIE && !isIE6 && !isOldIE)); // IE <7 doesn't do PNG nicely without crap filters
var docFrag = document.createDocumentFragment();
this.oControl = null; // toggle element
if (flakeLeftOffset == null) flakeLeftOffset = 0;
if (flakeRightOffset == null) flakeRightOffset = 0;
function rnd(n,min) {
if (isNaN(min)) min = 0;
return (Math.random()*n)+min;
}
this.randomizeWind = function() {
vRndX = plusMinus(rnd(vMaxX,0.2));
vRndY = rnd(vMaxY,0.2);
if (this.flakes) {
for (var i=0; i<this.flakes.length; i++) {
if (this.flakes[i].active) this.flakes[i].setVelocities();
}
}
}
function plusMinus(n) {
return (parseInt(rnd(2))==1?n*-1:n);
}
this.scrollHandler = function() {
// "attach" snowflakes to bottom of window if no absolute bottom value was given
scrollY = (flakeBottom?0:parseInt(window.scrollY||document.documentElement.scrollTop||document.body.scrollTop));
if (isNaN(scrollY)) scrollY = 0; // Netscape 6 scroll fix
if (!flakeBottom && s.flakes) {
for (var i=0; i<s.flakes.length; i++) {
if (s.flakes[i].active == 0) s.flakes[i].stick();
}
}
}
this.resizeHandler = function() {
if (window.innerWidth || window.innerHeight) {
screenX = window.innerWidth-(!isIE?16:2)-flakeRightOffset;
screenY = (flakeBottom?flakeBottom:window.innerHeight);
} else {
screenX = (document.documentElement.clientWidth||document.body.clientWidth||document.body.scrollWidth)-(!isIE?8:0)-flakeRightOffset;
screenY = flakeBottom?flakeBottom:(document.documentElement.clientHeight||document.body.clientHeight||document.body.scrollHeight);
}
screenX2 = parseInt(screenX/2);
}
this.resizeHandlerAlt = function() {
screenX = targetElement.offsetLeft+targetElement.offsetWidth-flakeRightOffset;
screenY = flakeBottom?flakeBottom:targetElement.offsetTop+targetElement.offsetHeight;
screenX2 = parseInt(screenX/2);
}
this.freeze = function() {
// pause animation
if (!s.disabled) {
s.disabled = 1;
} else {
return false;
}
for (var i=0; i<s.timers.length; i++) {
clearInterval(s.timers[i]);
}
}
this.resume = function() {
if (s.disabled) {
s.disabled = 0;
} else {
return false;
}
s.timerInit();
}
this.toggleSnow = function() {
if (!s.flakes.length) {
// first run
s.start();
s.setControlActive(true);
} else {
s.active = !s.active;
if (s.active) {
s.show();
s.resume();
s.setControlActive(true);
} else {
s.stop();
s.freeze();
s.setControlActive(false);
}
}
}
this.setControlActive = function(bActive) {
// Y.D[(bActive?'addClass':'removeClass')](s.oControl,'active');
}
this.stop = function() {
this.freeze();
for (var i=this.flakes.length; i--;) {
this.flakes[i].o.style.display = 'none';
}
removeEvent(window,'scroll',s.scrollHandler);
removeEvent(window,'resize',s.resizeHandler);
if (!isIE) {
removeEvent(window,'blur',s.freeze);
removeEvent(window,'focus',s.resume);
}
// removeEventHandler(window,'resize',this.resizeHandler,false);
}
this.show = function() {
for (var i=this.flakes.length; i--;) {
this.flakes[i].o.style.display = 'block';
}
}
this.SnowFlake = function(parent,type,x,y) {
var s = this;
var storm = parent;
this.type = type;
this.x = x||parseInt(rnd(screenX-20));
this.y = (!isNaN(y)?y:-rnd(screenY)-12);
this.vX = null;
this.vY = null;
this.vAmpTypes = [2.0,1.0,1.25,1.0,1.5,1.75]; // "amplification" for vX/vY (based on flake size/type)
this.vAmp = this.vAmpTypes[this.type];
this.active = 1;
this.o = document.createElement('img');
this.o.style.position = 'absolute';
this.o.style.width = flakeWidth+'px';
this.o.style.height = flakeHeight+'px';
this.o.style.fontSize = '1px'; // so IE keeps proper size
this.o.style.zIndex = zIndex;
this.o.src = imagePath+this.type+(pngSupported && usePNG?'.png':'.gif');
docFrag.appendChild(this.o);
this.refresh = function() {
s.o.style.left = s.x+'px';
s.o.style.top = s.y+'px';
}
this.stick = function() {
if (isIE6 || isiPhone || (targetElement != document.documentElement && targetElement != document.body)) {
s.o.style.top = (screenY+scrollY-flakeHeight-storm.terrain[Math.floor(s.x)])+'px';
} else {
s.o.style.display = 'none';
s.o.style.top = 'auto';
s.o.style.bottom = '0px';
s.o.style.position = 'fixed';
s.o.style.display = 'block';
}
}
this.vCheck = function() {
if (s.vX>=0 && s.vX<0.2) {
s.vX = 0.2;
} else if (s.vX<0 && s.vX>-0.2) {
s.vX = -0.2;
}
if (s.vY>=0 && s.vY<0.2) {
s.vY = 0.2;
}
}
this.move = function() {
s.x += s.vX*windOffset;
s.y += (s.vY*s.vAmp);
s.refresh();
if (s.vX && screenX-s.x<flakeWidth+(s.vX*windOffset)) { // X-axis scroll check
s.x = 0;
} else if ((s.vX<0 || windOffset<0)&& s.x-flakeLeftOffset<0-flakeWidth) {
s.x = screenX-flakeWidth; // flakeWidth;
}
var yDiff = screenY+scrollY-s.y-storm.terrain[Math.floor(s.x)];
if (yDiff<flakeHeight) {
s.active = 0;
if (snowCollect && snowStick) {
var height = [0.75,1.5,0.75];
for (var i=0; i<2; i++) {
storm.terrain[Math.floor(s.x)+i+2] += height[i];
}
}
s.o.style.left = (s.x/screenX*100)+'%'; // set "relative" left (change with resize)
if (!flakeBottom) {
if (snowStick) {
s.stick();
} else {
s.recycle();
}
}
}
}
this.animate = function() {
// main animation loop
// move, check status, die etc.
s.move();
}
this.setVelocities = function() {
s.vX = vRndX+rnd(vMaxX*0.12,0.1);
s.vY = vRndY+rnd(vMaxY*0.12,0.1);
}
this.recycle = function() {
s.o.style.display = 'none';
s.o.style.position = 'absolute';
s.o.style.bottom = 'auto';
s.setVelocities();
s.vCheck();
s.x = parseInt(rnd(screenX-flakeWidth-20));
s.y = parseInt(rnd(screenY)*-1)-flakeHeight;
s.o.style.left = s.x+'px';
s.o.style.top = s.y+'px';
s.o.style.display = 'block';
s.active = 1;
}
this.recycle(); // set up x/y coords etc.
this.refresh();
}
this.snow = function() {
var active = 0;
var used = 0;
var waiting = 0;
for (var i=s.flakes.length; i--;) {
if (s.flakes[i].active == 1) {
s.flakes[i].move();
active++;
} else if (s.flakes[i].active == 0) {
used++;
} else {
waiting++;
}
}
if (snowCollect && !waiting) { // !active && !waiting
// create another batch of snow
s.createSnow(flakesMaxActive,true);
}
if (active<flakesMaxActive) {
with (s.flakes[parseInt(rnd(s.flakes.length))]) {
if (!snowCollect && active == 0) {
recycle();
} else if (active == -1) {
active = 1;
}
}
}
}
this.mouseMove = function(e) {
if (!followMouse) return true;
var x = parseInt(e.clientX);
if (x<screenX2) {
windOffset = -windMultiplier+(x/screenX2*windMultiplier);
} else {
x -= screenX2;
windOffset = (x/screenX2)*windMultiplier;
}
}
this.createSnow = function(limit,allowInactive) {
for (var i=0; i<limit; i++) {
s.flakes[s.flakes.length] = new s.SnowFlake(s,parseInt(rnd(flakeTypes)));
if (allowInactive || i>flakesMaxActive) s.flakes[s.flakes.length-1].active = -1;
}
targetElement.appendChild(docFrag);
}
this.timerInit = function() {
s.timers = (!isWin9X?[setInterval(s.snow,20)]:[setInterval(s.snow,75),setInterval(s.snow,25)]);
}
this.init = function() {
for (var i=0; i<2048; i++) {
s.terrain[i] = 0;
}
s.randomizeWind();
s.createSnow(snowCollect?flakesMaxActive:flakesMaxActive*2); // create initial batch
addEvent(window,'resize',s.resizeHandler);
addEvent(window,'scroll',s.scrollHandler);
if (!isIE) {
addEvent(window,'blur',s.freeze);
addEvent(window,'focus',s.resume);
}
s.resizeHandler();
s.scrollHandler();
if (followMouse) {
addEvent(document,'mousemove',s.mouseMove);
}
s.timerInit();
}
var didInit = false;
this.start = function(bFromOnLoad) {
if (!didInit) {
didInit = true;
} else if (bFromOnLoad) {
// already loaded and running
return true;
}
if (typeof targetElement == 'string') {
targetElement = document.getElementById(targetElement);
if (!targetElement) throw new Error('Snowstorm: Unable to get targetElement');
}
if (!targetElement) {
targetElement = (!isIE?(document.documentElement?document.documentElement:document.body):document.body);
}
if (targetElement != document.documentElement && targetElement != document.body) s.resizeHandler = s.resizeHandlerAlt; // re-map handler to get element instead of screen dimensions
s.resizeHandler(); // get bounding box elements
if (screenX && screenY && !s.disabled) {
s.init();
s.active = true;
}
}
if (document.addEventListener) {
// safari 3.0.4 doesn't do DOMContentLoaded, maybe others - use a fallback to be safe.
document.addEventListener('DOMContentLoaded',function(){s.start(true)},false);
window.addEventListener('load',function(){s.start(true)},false);
} else {
addEvent(window,'load',function(){s.start(true)});
}
}
snowStorm = new SnowStorm();
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