Hiệu Ứng Lá Vàng Rơi

Để tạo được hiệu ứng lá vàng rơi bạn chỉ cần tạo một tiện ích và bỏ code bên dưới vào rồi save lại.
Cách làm:
Mỡ Blogger, vào Bố cục(layout), tạo một Widget có tên HTML/JavaScript
Chép Source Code nầy vào trang soạn thảo.
Xong Save lại Widget và cho chạy thử Blogspot. CODE

<script type="text/javascript">
// <![CDATA[
var speed=40; // lower number for faster
var leaves=20; // number of leaves falling at a time
var untidy=4; // how often do you want the leaves tidied up (high number is less often)

var boddie;
var dx=new Array();
var xp=new Array();
var yp=new Array();
var am=new Array();
var dy=new Array();
var le=new Array();
var swide=480;
var shigh=320;
var sleft=0;
var starty=0;
var offset=0;
var tidying=0;
var deeex=0;
var has_focus=true;
var ie_version=(navigator.appVersion.indexOf("MSIE")!=-1)?parseFloat(navigator.appVersion.split("MSIE")[1]):false;
var plow=document.createElement("img");
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var leafy=new Array();
var leaf_image=new Array();
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function addLoadEvent(funky) {
  var oldonload=window.onload;
  if (typeof(oldonload)!='function') window.onload=funky;
  else window.onload=function() {
    if (oldonload) oldonload();
    funky();
  }
}

addLoadEvent(september_21);

function september_21() { if (document.getElementById) {
  var i;
  if (ie_version) {
    document.onfocusin=function(){has_focus=true;};
    document.onfocusout=function(){has_focus=false;};
  } 
  else {
    window.onfocus=function(){has_focus=true;};
    window.onblur=function(){has_focus=false;};
  }
  window.onscroll=set_scroll;
  window.onresize=set_width;
  document.onmousemove=mouse;
  boddie=document.createElement("div");
  boddie.style.position="fixed";
  boddie.style.bottom="0px";
  boddie.style.left="0px";
  boddie.style.width="100%";
  boddie.style.overflow="visible";
  boddie.style.backgroundColor="transparent";
  boddie.style.pointerEvents="none";
  boddie.style.zIndex="0";
  document.body.insertBefore(boddie, document.body.firstChild); 
  set_width();
  plow.style.position="absolute";
  plow.style.overflow="hidden";
  plow.style.zIndex=9999;
  plow.style.bottom="0px";
  plow.style.left="-144px";
  boddie.appendChild(plow);
  for (i=0; i<leaves; i++) start_leaf(Math.random()*shigh*3/4);
  offset=0;
  setInterval("autumn_leaves()", speed);
}}

function start_leaf(whyp) {
  starty++;
  offset++;
  var f, size;
  size=start_fall(starty, whyp);
  f=document.createElement("img");
  f.src=leaf_image[starty%leaf_image.length];
  f.width=size;
  f.style.height="auto";
  f.style.position="absolute";
  f.style.zIndex=1000+starty;
  f.style.top=yp[starty]+"px";
  f.style.left=xp[starty]+"px";
  leafy[starty]=f;
  boddie.appendChild(f);
}
  
function start_fall(i, whyp) {
  var size=72-Math.floor(36*Math.random());
  dx[i]=Math.random();
  am[i]=8+Math.random()*24;
  dy[i]=1+Math.random()*2;
  xp[i]=Math.random()*(swide-size);
  yp[i]=whyp-size;
  le[i]='falling';
  return size;
}

function set_width() {
  var sw, sh;
  if (typeof(window.innerWidth)=='number' && window.innerWidth) {
    sw=window.innerWidth;
    sh=window.innerHeight;
  }
  else if (document.compatMode=="CSS1Compat" && document.documentElement && document.documentElement.clientWidth) {
    sw=document.documentElement.clientWidth;
    sh=document.documentElement.clientHeight; 
  }
  else {
    sw=document.body.clientWidth;
 sh=document.body.clientHeight;
  }
  if (sw && sh && has_focus) {
    swide=sw;
    shigh=sh;
  }
  boddie.style.height=shigh+"px";
}

function autumn_leaves() {
  var i;
  var c=0;
  for (i=0; i<starty; i++) {
    if (leafy[i] && le[i]!='tidying') {
  if (yp[i]>shigh || xp[i]>swide || xp[i]<-leafy[i].width) {
    if (offset>0) offset--;
    boddie.removeChild(leafy[i]);
    leafy[i]=false;
  }
  else if (yp[i]+untidy*offset/leaves<shigh-leafy[i].height/2) {
    yp[i]+=dy[i];
    dx[i]+=0.025+Math.random()/10;
    xp[i]+=deeex;
    leafy[i].style.top=(yp[i]-am[i]/2*Math.abs(Math.sin(dx[i])))+"px";
    leafy[i].style.left=(xp[i]+am[i]*Math.sin(dx[i]))+"px";
  }
  else if (le[i]=='falling') le[i]='landed';
 }
 if (leafy[i] && le[i]=='falling') c++;
  }
  if (c<leaves) start_leaf(0);
  if (offset>untidy*leaves && !tidying && Math.random()<.05) tidy_leaves();
}

function tidy_leaves() {
  var i;
  tidying=true;
  for (i=swide; i>=-146; i-=2) setTimeout('plough('+i+')', speed*(swide-i));
  setTimeout('tidying=false; offset=0;', speed*(swide-i));
}

function plough(x) {
  var i, p;
  plow.style.left=x+"px";
  for (i=0; i<starty; i++) {
    if (leafy[i] && le[i]!='falling') {
   p=xp[i]+leafy[i].width+am[i]*Math.sin(dx[i])-dy[i];
   if (p<0) {
     boddie.removeChild(leafy[i]);
  leafy[i]=false;
   }
   else if (p>x && p<x+3) {
     le[i]='tidying';
     xp[i]-=2;
     leafy[i].style.left=(xp[i]+am[i]*Math.sin(dx[i]))+"px";
     if (Math.random()<.1) {
    yp[i]-=1;
    leafy[i].style.top=(yp[i]-am[i]/2*Math.abs(Math.sin(dx[i])))+"px";
     }
   }
   else if (p>x+144 && yp[i]<shigh-leafy[i].height/2) {
       yp[i]+=dy[i];
  dx[i]+=0.02+Math.random()/10;
  leafy[i].style.top=(yp[i]-am[i]/2*Math.abs(Math.sin(dx[i])))+"px";
  leafy[i].style.left=(xp[i]+am[i]*Math.sin(dx[i]))+"px";
   }
 }
  }
}

function set_scroll() {
  if (typeof(self.pageXOffset)=='number' && self.pageXoffset) sleft=self.pageXOffset;
  else if (document.body && document.body.scrollLeft) sleft=document.body.scrollLeft;
  else if (document.documentElement && document.documentElement.scrollLeft) sleft=document.documentElement.scrollLeft;
  else sleft=0;
}

function mouse(e) {
  var x;
  if (e) x=e.pageX;
  else {
 x=event.x;
    set_scroll();
    x+=sleft;
  }
  deeex=has_focus?Math.floor(-1.5+4*(x-sleft)/swide):0;
}
// ]]>
</script>

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