1. Đăng nhập vào Blogspot ---> Bố cục (Layout)
2. Trong phần bố cục bạn chọn ---> Thêm tiện ích (chọn cái tiện ích nào dài toàn bộ màn hình nhé, nếu ko mưa tuyết ko phủ khắp blog của bạn đâu)
3. Tìm đến tiện ích ----> HTML/Javascript
4. Copy/Paste code dưới vào là xong...
Đầu tiên là tạo hiệu ứng tuyết rơi
<script type='text/javascript'>
//<![CDATA[
var snowmax=100
var snowcolor=new Array("#f2f8fa","#eff5f7","#dcedf1","#ffffff")
var snowtype=new Array("Times","Arial","Times","Verdana")
var snowletter="*"
var sinkspeed=0.6
var snowmaxsize=30
var snowminsize=10
// Set 1 for all-over-snowing, set 2 for left-side-snowing
// Set 3 for center-snowing, set 4 for right-side-snowing
var snowingzone=1
// Do not edit below this line
var snow=new Array()
var marginbottom
var marginright
var timer
var i_snow=0
var x_mv=new Array();
var crds=new Array();
var lftrght=new Array();
var browserinfos=navigator.userAgent
var ie5=document.all&&document.getElementById&&!browserinfos.match(/Opera/)
var ns6=document.getElementById&&!document.all
var opera=browserinfos.match(/Opera/)
var browserok=ie5||ns6||opera
function randommaker(range) {
rand=Math.floor(range*Math.random())
return rand
}
function initsnow() {
if (ie5 || opera) {
marginbottom = document.body.scrollHeight
marginright = document.body.clientWidth-15
}
else if (ns6) {
marginbottom = document.body.scrollHeight
marginright = window.innerWidth-15
}
var snowsizerange=snowmaxsize-snowminsize
for (i=0;i<=snowmax;i++) {
crds[i] = 0;
lftrght[i] = Math.random()*15;
x_mv[i] = 0.03 + Math.random()/10;
snow[i]=document.getElementById("s"+i)
snow[i].style.fontFamily=snowtype[randommaker(snowtype.length)]
snow[i].size=randommaker(snowsizerange)+snowminsize
snow[i].style.fontSize=snow[i].size+'px';
snow[i].style.color=snowcolor[randommaker(snowcolor.length)]
snow[i].style.zIndex=1000
snow[i].sink=sinkspeed*snow[i].size/5
if (snowingzone==1) {snow[i].posx=randommaker(marginright-snow[i].size)}
if (snowingzone==2) {snow[i].posx=randommaker(marginright/2-snow[i].size)}
if (snowingzone==3) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}
if (snowingzone==4) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}
snow[i].posy=randommaker(2*marginbottom-marginbottom-2*snow[i].size)
snow[i].style.left=snow[i].posx+'px';
snow[i].style.top=snow[i].posy+'px';
}
movesnow()
}
function movesnow() {
for (i=0;i<=snowmax;i++) {
crds[i] += x_mv[i];
snow[i].posy+=snow[i].sink
snow[i].style.left=snow[i].posx+lftrght[i]*Math.sin(crds[i])+'px';
snow[i].style.top=snow[i].posy+'px';
if (snow[i].posy>=marginbottom-2*snow[i].size || parseInt(snow[i].style.left)>(marginright-3*lftrght[i])){
if (snowingzone==1) {snow[i].posx=randommaker(marginright-snow[i].size)}
if (snowingzone==2) {snow[i].posx=randommaker(marginright/2-snow[i].size)}
if (snowingzone==3) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}
if (snowingzone==4) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}
snow[i].posy=0
}
}
var timer=setTimeout("movesnow()",50)
}
for (i=0;i<=snowmax;i++) {
document.write("<span id='s"+i+"' style='position:absolute;top:-"+snowmaxsize+"'>"+snowletter+"</span>")
}
if (browserok) {
window.onload=initsnow
}
//]]>
</script>
Hiệu ứng bắn pháo hoa cho blog (Lưu ý ko thể dùng cùng lúc 2 hiệu ứng nhé :x)<script type="text/javascript">
// <![CDATA[
var bits=80; // how many bits
var speed=33; // how fast - smaller is faster
var bangs=5; // how many can be launched simultaneously (note that using too many can slow the script down)
var colours=new Array("#03f", "#f03", "#0e0", "#93f", "#0cf", "#f93", "#f0c");
// blue red green purple cyan orange pink
/****************************
* Fireworks Effect *
*(c)2004-11 mf2fm web-design*
* http://www.mf2fm.com/rv *
* DON'T EDIT BELOW THIS BOX *
****************************/
var bangheight=new Array();
var intensity=new Array();
var colour=new Array();
var Xpos=new Array();
var Ypos=new Array();
var dX=new Array();
var dY=new Array();
var stars=new Array();
var decay=new Array();
var swide=800;
var shigh=600;
var boddie;
window.onload=function() { if (document.getElementById) {
var i;
boddie=document.createElement("div");
boddie.style.position="fixed";
boddie.style.top="0px";
boddie.style.left="0px";
boddie.style.overflow="visible";
boddie.style.width="1px";
boddie.style.height="1px";
boddie.style.backgroundColor="transparent";
document.body.appendChild(boddie);
set_width();
for (i=0; i<bangs; i++) {
write_fire(i);
launch(i);
setInterval('stepthrough('+i+')', speed);
}
}}
function write_fire(N) {
var i, rlef, rdow;
stars[N+'r']=createDiv('|', 12);
boddie.appendChild(stars[N+'r']);
for (i=bits*N; i<bits+bits*N; i++) {
stars[i]=createDiv('*', 13);
boddie.appendChild(stars[i]);
}
}
function createDiv(char, size) {
var div=document.createElement("div");
div.style.font=size+"px monospace";
div.style.position="absolute";
div.style.backgroundColor="transparent";
div.appendChild(document.createTextNode(char));
return (div);
}
function launch(N) {
colour[N]=Math.floor(Math.random()*colours.length);
Xpos[N+"r"]=swide*0.5;
Ypos[N+"r"]=shigh-5;
bangheight[N]=Math.round((0.5+Math.random())*shigh*0.4);
dX[N+"r"]=(Math.random()-0.5)*swide/bangheight[N];
if (dX[N+"r"]>1.25) stars[N+"r"].firstChild.nodeValue="/";
else if (dX[N+"r"]<-1.25) stars[N+"r"].firstChild.nodeValue="\\";
else stars[N+"r"].firstChild.nodeValue="|";
stars[N+"r"].style.color=colours[colour[N]];
}
function bang(N) {
var i, Z, A=0;
for (i=bits*N; i<bits+bits*N; i++) {
Z=stars[i].style;
Z.left=Xpos[i]+"px";
Z.top=Ypos[i]+"px";
if (decay[i]) decay[i]--;
else A++;
if (decay[i]==15) Z.fontSize="7px";
else if (decay[i]==7) Z.fontSize="2px";
else if (decay[i]==1) Z.visibility="hidden";
Xpos[i]+=dX[i];
Ypos[i]+=(dY[i]+=1.25/intensity[N]);
}
if (A!=bits) setTimeout("bang("+N+")", speed);
}
function stepthrough(N) {
var i, M, Z;
var oldx=Xpos[N+"r"];
var oldy=Ypos[N+"r"];
Xpos[N+"r"]+=dX[N+"r"];
Ypos[N+"r"]-=4;
if (Ypos[N+"r"]<bangheight[N]) {
M=Math.floor(Math.random()*3*colours.length);
intensity[N]=5+Math.random()*4;
for (i=N*bits; i<bits+bits*N; i++) {
Xpos[i]=Xpos[N+"r"];
Ypos[i]=Ypos[N+"r"];
dY[i]=(Math.random()-0.5)*intensity[N];
dX[i]=(Math.random()-0.5)*(intensity[N]-Math.abs(dY[i]))*1.25;
decay[i]=16+Math.floor(Math.random()*16);
Z=stars[i];
if (M<colours.length) Z.style.color=colours[i%2?colour[N]:M];
else if (M<2*colours.length) Z.style.color=colours[colour[N]];
else Z.style.color=colours[i%colours.length];
Z.style.fontSize="13px";
Z.style.visibility="visible";
}
bang(N);
launch(N);
}
stars[N+"r"].style.left=oldx+"px";
stars[N+"r"].style.top=oldy+"px";
}
window.onresize=set_width;
function set_width() {
var sw_min=999999;
var sh_min=999999;
if (document.documentElement && document.documentElement.clientWidth) {
if (document.documentElement.clientWidth>0) sw_min=document.documentElement.clientWidth;
if (document.documentElement.clientHeight>0) sh_min=document.documentElement.clientHeight;
}
if (typeof(self.innerWidth)!="undefined" && self.innerWidth) {
if (self.innerWidth>0 && self.innerWidth<sw_min) sw_min=self.innerWidth;
if (self.innerHeight>0 && self.innerHeight<sh_min) sh_min=self.innerHeight;
}
if (document.body.clientWidth) {
if (document.body.clientWidth>0 && document.body.clientWidth<sw_min) sw_min=document.body.clientWidth;
if (document.body.clientHeight>0 && document.body.clientHeight<sh_min) sh_min=document.body.clientHeight;
}
if (sw_min==999999 || sh_min==999999) {
sw_min=800;
sh_min=600;
}
swide=sw_min;
shigh=sh_min;
}
// ]]>
</script>

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