Como Colocar Efeito Neve Caindo No Blog

Faça uma decoração especial de Natal no seu blog, coloque um gadget com efeito de neve caindo no seu blog. Este é um código simples para adicionar no blog para fazer neve cair nas paginas do seu site. Já fizemos alguns testes e funcionou bem nos 3 principais navegadores: Internet Explorer, Firefox e Google Chrome. Veja aqui uma demonstração do efeito neve no blog.

Para fazer o efeito neve no seu blog entre na pagina layout > adicionar gadget > html/javascript e cole esse código:

<script>/** @license DHTML Snowstorm! JavaScript-based Snow for web pages
--------------------------------------------------------
Version 1.43.20111201 (Previous rev: 1.42.20111120)
Copyright (c) 2007, Scott Schiller. All rights reserved.
Code provided under the BSD License:
http://schillmania.com/projects/snowstorm/license.txt
*/
var snowStorm=function(e,d){function g(a,d){isNaN(d)&&(d=0);return Math.random()*a+d}function o(){e.setTimeout(function(){a.start(true)},20);a.events.remove(i?d:e,"mousemove",o)}function r(){if(!a.excludeMobile||!s)a.freezeOnBlur?a.events.add(i?d:e,"mousemove",o):o();a.events.remove(e,"load",r)}this.autoStart=true;this.flakesMax=128;this.flakesMaxActive=64;this.animationInterval=33;this.excludeMobile=true;this.flakeBottom=null;this.followMouse=true;this.snowColor="#fff";this.snowCharacter="&bull;";
this.snowStick=true;this.targetElement=null;this.useMeltEffect=true;this.usePositionFixed=this.useTwinkleEffect=false;this.freezeOnBlur=true;this.flakeRightOffset=this.flakeLeftOffset=0;this.flakeHeight=this.flakeWidth=8;this.vMaxX=5;this.vMaxY=4;this.zIndex=0;var a=this,y=this,i=navigator.userAgent.match(/msie/i),z=navigator.userAgent.match(/msie 6/i),A=navigator.appVersion.match(/windows 98/i),s=navigator.userAgent.match(/mobile|opera m(ob|in)/i),B=i&&d.compatMode==="BackCompat",t=s||B||z,h=null,
k=null,j=null,m=null,u=null,v=null,p=1,n=false,q;a:{try{d.createElement("div").style.opacity="0.5"}catch(C){q=false;break a}q=true}var w=false,x=d.createDocumentFragment();this.timers=[];this.flakes=[];this.active=this.disabled=false;this.meltFrameCount=20;this.meltFrames=[];this.events=function(){function a(b){var b=f.call(b),c=b.length;l?(b[1]="on"+b[1],c>3&&b.pop()):c===3&&b.push(false);return b}function d(a,c){var e=a.shift(),f=[b[c]];if(l)e[f](a[0],a[1]);else e[f].apply(e,a)}var l=!e.addEventListener&&
e.attachEvent,f=Array.prototype.slice,b={add:l?"attachEvent":"addEventListener",remove:l?"detachEvent":"removeEventListener"};return{add:function(){d(a(arguments),"add")},remove:function(){d(a(arguments),"remove")}}}();this.randomizeWind=function(){var c;c=g(a.vMaxX,0.2);u=parseInt(g(2),10)===1?c*-1:c;v=g(a.vMaxY,0.2);if(this.flakes)for(c=0;c<this.flakes.length;c++)this.flakes[c].active&&this.flakes[c].setVelocities()};this.scrollHandler=function(){var c;m=a.flakeBottom?0:parseInt(e.scrollY||d.documentElement.scrollTop||
d.body.scrollTop,10);isNaN(m)&&(m=0);if(!n&&!a.flakeBottom&&a.flakes)for(c=a.flakes.length;c--;)a.flakes[c].active===0&&a.flakes[c].stick()};this.resizeHandler=function(){e.innerWidth||e.innerHeight?(h=e.innerWidth-16-a.flakeRightOffset,j=a.flakeBottom?a.flakeBottom:e.innerHeight):(h=(d.documentElement.clientWidth||d.body.clientWidth||d.body.scrollWidth)-(!i?8:0)-a.flakeRightOffset,j=a.flakeBottom?a.flakeBottom:d.documentElement.clientHeight||d.body.clientHeight||d.body.scrollHeight);k=parseInt(h/
2,10)};this.resizeHandlerAlt=function(){h=a.targetElement.offsetLeft+a.targetElement.offsetWidth-a.flakeRightOffset;j=a.flakeBottom?a.flakeBottom:a.targetElement.offsetTop+a.targetElement.offsetHeight;k=parseInt(h/2,10)};this.freeze=function(){var c;if(a.disabled)return false;else a.disabled=1;for(c=a.timers.length;c--;)clearInterval(a.timers[c])};this.resume=function(){if(a.disabled)a.disabled=0;else return false;a.timerInit()};this.toggleSnow=function(){a.flakes.length?(a.active=!a.active,a.active?
(a.show(),a.resume()):(a.stop(),a.freeze())):a.start()};this.stop=function(){var c;this.freeze();for(c=this.flakes.length;c--;)this.flakes[c].o.style.display="none";a.events.remove(e,"scroll",a.scrollHandler);a.events.remove(e,"resize",a.resizeHandler);a.freezeOnBlur&&(i?(a.events.remove(d,"focusout",a.freeze),a.events.remove(d,"focusin",a.resume)):(a.events.remove(e,"blur",a.freeze),a.events.remove(e,"focus",a.resume)))};this.show=function(){var a;for(a=this.flakes.length;a--;)this.flakes[a].o.style.display=
"block"};this.SnowFlake=function(a,e,l,f){var b=this;this.type=e;this.x=l||parseInt(g(h-20),10);this.y=!isNaN(f)?f:-g(j)-12;this.vY=this.vX=null;this.vAmpTypes=[1,1.2,1.4,1.6,1.8];this.vAmp=this.vAmpTypes[this.type];this.melting=false;this.meltFrameCount=a.meltFrameCount;this.meltFrames=a.meltFrames;this.twinkleFrame=this.meltFrame=0;this.active=1;this.fontSize=10+this.type/5*10;this.o=d.createElement("div");this.o.innerHTML=a.snowCharacter;this.o.style.color=a.snowColor;this.o.style.position=n?"fixed":
"absolute";this.o.style.width=a.flakeWidth+"px";this.o.style.height=a.flakeHeight+"px";this.o.style.fontFamily="arial,verdana";this.o.style.cursor="default";this.o.style.overflow="hidden";this.o.style.fontWeight="normal";this.o.style.zIndex=a.zIndex;x.appendChild(this.o);this.refresh=function(){if(isNaN(b.x)||isNaN(b.y))return false;b.o.style.left=b.x+"px";b.o.style.top=b.y+"px"};this.stick=function(){t||a.targetElement!==d.documentElement&&a.targetElement!==d.body?b.o.style.top=j+m-a.flakeHeight+
"px":a.flakeBottom?b.o.style.top=a.flakeBottom+"px":(b.o.style.display="none",b.o.style.top="auto",b.o.style.bottom="0px",b.o.style.position="fixed",b.o.style.display="block")};this.vCheck=function(){if(b.vX>=0&&b.vX<0.2)b.vX=0.2;else if(b.vX<0&&b.vX>-0.2)b.vX=-0.2;if(b.vY>=0&&b.vY<0.2)b.vY=0.2};this.move=function(){var d=b.vX*p;b.x+=d;b.y+=b.vY*b.vAmp;if(b.x>=h||h-b.x<a.flakeWidth)b.x=0;else if(d<0&&b.x-a.flakeLeftOffset<-a.flakeWidth)b.x=h-a.flakeWidth-1;b.refresh();if(j+m-b.y<a.flakeHeight)b.active=
0,a.snowStick?b.stick():b.recycle();else{if(a.useMeltEffect&&b.active&&b.type<3&&!b.melting&&Math.random()>0.998)b.melting=true,b.melt();if(a.useTwinkleEffect)if(b.twinkleFrame)b.twinkleFrame--,b.o.style.visibility=b.twinkleFrame&&b.twinkleFrame%2===0?"hidden":"visible";else if(Math.random()>0.9)b.twinkleFrame=parseInt(Math.random()*20,10)}};this.animate=function(){b.move()};this.setVelocities=function(){b.vX=u+g(a.vMaxX*0.12,0.1);b.vY=v+g(a.vMaxY*0.12,0.1)};this.setOpacity=function(a,b){if(!q)return false;
a.style.opacity=b};this.melt=function(){!a.useMeltEffect||!b.melting?b.recycle():b.meltFrame<b.meltFrameCount?(b.setOpacity(b.o,b.meltFrames[b.meltFrame]),b.o.style.fontSize=b.fontSize-b.fontSize*(b.meltFrame/b.meltFrameCount)+"px",b.o.style.lineHeight=a.flakeHeight+2+a.flakeHeight*0.75*(b.meltFrame/b.meltFrameCount)+"px",b.meltFrame++):b.recycle()};this.recycle=function(){b.o.style.display="none";b.o.style.position=n?"fixed":"absolute";b.o.style.bottom="auto";b.setVelocities();b.vCheck();b.meltFrame=
0;b.melting=false;b.setOpacity(b.o,1);b.o.style.padding="0px";b.o.style.margin="0px";b.o.style.fontSize=b.fontSize+"px";b.o.style.lineHeight=a.flakeHeight+2+"px";b.o.style.textAlign="center";b.o.style.verticalAlign="baseline";b.x=parseInt(g(h-a.flakeWidth-20),10);b.y=parseInt(g(j)*-1,10)-a.flakeHeight;b.refresh();b.o.style.display="block";b.active=1};this.recycle();this.refresh()};this.snow=function(){for(var c=0,d=0,e=0,f=null,f=a.flakes.length;f--;)a.flakes[f].active===1?(a.flakes[f].move(),c++):
a.flakes[f].active===0?d++:e++,a.flakes[f].melting&&a.flakes[f].melt();if(c<a.flakesMaxActive&&(f=a.flakes[parseInt(g(a.flakes.length),10)],f.active===0))f.melting=true};this.mouseMove=function(c){if(!a.followMouse)return true;c=parseInt(c.clientX,10);c<k?p=-2+c/k*2:(c-=k,p=c/k*2)};this.createSnow=function(c,d){var e;for(e=0;e<c;e++)if(a.flakes[a.flakes.length]=new a.SnowFlake(a,parseInt(g(6),10)),d||e>a.flakesMaxActive)a.flakes[a.flakes.length-1].active=-1;y.targetElement.appendChild(x)};this.timerInit=
function(){a.timers=!A?[setInterval(a.snow,a.animationInterval)]:[setInterval(a.snow,a.animationInterval*3),setInterval(a.snow,a.animationInterval)]};this.init=function(){var c;for(c=0;c<a.meltFrameCount;c++)a.meltFrames.push(1-c/a.meltFrameCount);a.randomizeWind();a.createSnow(a.flakesMax);a.events.add(e,"resize",a.resizeHandler);a.events.add(e,"scroll",a.scrollHandler);a.freezeOnBlur&&(i?(a.events.add(d,"focusout",a.freeze),a.events.add(d,"focusin",a.resume)):(a.events.add(e,"blur",a.freeze),a.events.add(e,
"focus",a.resume)));a.resizeHandler();a.scrollHandler();a.followMouse&&a.events.add(i?d:e,"mousemove",a.mouseMove);a.animationInterval=Math.max(20,a.animationInterval);a.timerInit()};this.start=function(c){if(w){if(c)return true}else w=true;if(typeof a.targetElement==="string"&&(c=a.targetElement,a.targetElement=d.getElementById(c),!a.targetElement))throw Error('Snowstorm: Unable to get targetElement "'+c+'"');if(!a.targetElement)a.targetElement=!i?d.documentElement?d.documentElement:d.body:d.body;
if(a.targetElement!==d.documentElement&&a.targetElement!==d.body)a.resizeHandler=a.resizeHandlerAlt;a.resizeHandler();a.usePositionFixed=a.usePositionFixed&&!t;n=a.usePositionFixed;if(h&&j&&!a.disabled)a.init(),a.active=true};a.autoStart&&a.events.add(e,"load",r,false);return this}(window,document);</script>

Como você pode imaginar o efeito neve funciona melhor em sites que usam cores ou imagens de fundo de cor escura, mas é possível alterar a cor dos flocos neve que na verdade são pontinhos coloridos. Para fazer isso procure o trecho: this.snowColor="#fff"

E modifique as letras fff para usar cor que desejar.

Claro que esse efeito só será útil ou agradável para alguns blogs dependendo do tipo de publico que visita seu blog, por isso avalie se os seus visitantes vão gostar de ver caindo neve no seu blog.