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Hiệu ứng Tuyết rơi và chữ Merry chrismas cho blog

Hiệu ứng Tuyết rơi và chữ Merry chrismas cho blog
Tạo tuyết rơi cho bloger
Xem Demo ngay tại bài viết này
Muốn tạo cảnh tuyết rơi trên blog bạn làm như sau vào Bố cục-Thêm tiện ích-HTML/Javascript
Dán code sau vào rồi lưu lại

<script type='text/javascript'>
//<![CDATA[
var snowStorm = null;

function SnowStorm() {

// --- PROPERTIES ---

this.flakesMax = 128; // Limit total amount of snow made (falling + sticking)
this.flakesMaxActive = 64; // Limit amount of snow falling at once (less = lower CPU use)
this.animationInterval = 33; // Theoretical "miliseconds per frame" measurement. 20 = fast + smooth, but high CPU use. 50 = more conservative, but slower
this.flakeBottom = null; // Integer for Y axis snow limit, 0 or null for "full-screen" snow effect
this.targetElement = null; // element which snow will be appended to (document body if null/undefined) - can be an element ID string, or a DOM node reference
this.followMouse = true; // Snow will change movement with the user's mouse
this.snowColor = '#fff'; // Don't eat (or use?) yellow snow.
this.snowCharacter = '&bull;'; // &bull; = bullet, &middot; is square on some systems etc.
this.snowStick = true; // Whether or not snow should "stick" at the bottom. When off, will never collect.
this.useMeltEffect = true; // When recycling fallen snow (or rarely, when falling), have it "melt" and fade out if browser supports it
this.useTwinkleEffect = false; // Allow snow to randomly "flicker" in and out of view while falling
this.usePositionFixed = false; // true = snow not affected by window scroll. may increase CPU load, disabled by default - if enabled, used only where supported

// --- less-used bits ---

this.flakeLeftOffset = 0; // amount to subtract from edges of container
this.flakeRightOffset = 0; // amount to subtract from edges of container
this.flakeWidth = 8; // max pixel width for snow element
this.flakeHeight = 8; // max pixel height for snow element
this.vMaxX = 5; // Maximum X velocity range for snow
this.vMaxY = 4; // Maximum Y velocity range
this.zIndex = 0; // CSS stacking order applied to each snowflake

// --- End of user section ---

// jslint global declarations
/*global window, document, navigator, clearInterval, setInterval */

var addEvent = (typeof(window.attachEvent)=='undefined'?function(o,evtName,evtHandler) {
return o.addEventListener(evtName,evtHandler,false);
}:function(o,evtName,evtHandler) {
return o.attachEvent('on'+evtName,evtHandler);
});

var removeEvent = (typeof(window.attachEvent)=='undefined'?function(o,evtName,evtHandler) {
return o.removeEventListener(evtName,evtHandler,false);
}:function(o,evtName,evtHandler) {
return o.detachEvent('on'+evtName,evtHandler);
});

function rnd(n,min) {
if (isNaN(min)) {
min = 0;
}
return (Math.random()*n)+min;
}

function plusMinus(n) {
return (parseInt(rnd(2),10)==1?n*-1:n);
}

var s = this;
var storm = this;
this.timers = [];
this.flakes = [];
this.disabled = false;
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 isBackCompatIE = (isIE && document.compatMode == 'BackCompat');
var noFixed = ((isBackCompatIE || isIE6 || isiPhone)?true:false);
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 flakeTypes = 6;
var fixedForEverything = false;
var opacitySupported = (function(){
try {
document.createElement('div').style.opacity = '0.5';
} catch (e) {
return false;
}
return true;
})();
var docFrag = document.createDocumentFragment();
if (s.flakeLeftOffset === null) {
s.flakeLeftOffset = 0;
}
if (s.flakeRightOffset === null) {
s.flakeRightOffset = 0;
}

this.meltFrameCount = 20;
this.meltFrames = [];
for (var i=0; i<this.meltFrameCount; i++) {
this.meltFrames.push(1-(i/this.meltFrameCount));
}

this.randomizeWind = function() {
vRndX = plusMinus(rnd(s.vMaxX,0.2));
vRndY = rnd(s.vMaxY,0.2);
if (this.flakes) {
for (var i=0; i<this.flakes.length; i++) {
if (this.flakes[i].active) {
this.flakes[i].setVelocities();
}
}
}
};

this.scrollHandler = function() {
// "attach" snowflakes to bottom of window if no absolute bottom value was given
scrollY = (s.flakeBottom?0:parseInt(window.scrollY||document.documentElement.scrollTop||document.body.scrollTop,10));
if (isNaN(scrollY)) {
scrollY = 0; // Netscape 6 scroll fix
}
if (!fixedForEverything && !s.flakeBottom && s.flakes) {
for (var 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)-s.flakeRightOffset;
screenY = (s.flakeBottom?s.flakeBottom:window.innerHeight);
} else {
screenX = (document.documentElement.clientWidth||document.body.clientWidth||document.body.scrollWidth)-(!isIE?8:0)-s.flakeRightOffset;
screenY = s.flakeBottom?s.flakeBottom:(document.documentElement.clientHeight||document.body.clientHeight||document.body.scrollHeight);
}
screenX2 = parseInt(screenX/2,10);
};

this.resizeHandlerAlt = function() {
screenX = s.targetElement.offsetLeft+s.targetElement.offsetWidth-s.flakeRightOffset;
screenY = s.flakeBottom?s.flakeBottom:s.targetElement.offsetTop+s.targetElement.offsetHeight;
screenX2 = parseInt(screenX/2,10);
};

this.freeze = function() {
// pause animation
if (!s.disabled) {
s.disabled = 1;
} else {
return false;
}
for (var 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();
} else {
s.active = !s.active;
if (s.active) {
s.show();
s.resume();
} else {
s.stop();
s.freeze();
}
}
};

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 (!isOldIE) {
removeEvent(window,'blur',s.freeze);
removeEvent(window,'focus',s.resume);
}
};

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),10);
this.y = (!isNaN(y)?y:-rnd(screenY)-12);
this.vX = null;
this.vY = null;
this.vAmpTypes = [1,1.2,1.4,1.6,1.8]; // "amplification" for vX/vY (based on flake size/type)
this.vAmp = this.vAmpTypes[this.type];
this.melting = false;
this.meltFrameCount = storm.meltFrameCount;
this.meltFrames = storm.meltFrames;
this.meltFrame = 0;
this.twinkleFrame = 0;
this.active = 1;
this.fontSize = (10+(this.type/5)*10);
this.o = document.createElement('div');
this.o.innerHTML = storm.snowCharacter;
this.o.style.color = storm.snowColor;
this.o.style.position = (fixedForEverything?'fixed':'absolute');
this.o.style.width = storm.flakeWidth+'px';
this.o.style.height = storm.flakeHeight+'px';
this.o.style.fontFamily = 'arial,verdana';
this.o.style.overflow = 'hidden';
this.o.style.fontWeight = 'normal';
this.o.style.zIndex = storm.zIndex;
docFrag.appendChild(this.o);

this.refresh = function() {
if (isNaN(s.x) || isNaN(s.y)) {
// safety check
return false;
}
s.o.style.left = s.x+'px';
s.o.style.top = s.y+'px';
};

this.stick = function() {
if (noFixed || (storm.targetElement != document.documentElement && storm.targetElement != document.body)) {
s.o.style.top = (screenY+scrollY-storm.flakeHeight)+'px';
} else if (storm.flakeBottom) {
s.o.style.top = storm.flakeBottom+'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() {
var vX = s.vX*windOffset;
s.x += vX;
s.y += (s.vY*s.vAmp);
if (s.x >= screenX || screenX-s.x < storm.flakeWidth) { // X-axis scroll check
s.x = 0;
} else if (vX < 0 && s.x-storm.flakeLeftOffset<0-storm.flakeWidth) {
s.x = screenX-storm.flakeWidth-1; // flakeWidth;
}
s.refresh();
var yDiff = screenY+scrollY-s.y;
if (yDiff<storm.flakeHeight) {
s.active = 0;
if (storm.snowStick) {
s.stick();
} else {
s.recycle();
}
} else {
if (storm.useMeltEffect && s.active && s.type < 3 && !s.melting && Math.random()>0.998) {
// ~1/1000 chance of melting mid-air, with each frame
s.melting = true;
s.melt();
// only incrementally melt one frame
// s.melting = false;
}
if (storm.useTwinkleEffect) {
if (!s.twinkleFrame) {
if (Math.random()>0.9) {
s.twinkleFrame = parseInt(Math.random()*20,10);
}
} else {
s.twinkleFrame--;
s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame%2===0?'hidden':'visible');
}
}
}
};

this.animate = function() {
// main animation loop
// move, check status, die etc.
s.move();
};

this.setVelocities = function() {
s.vX = vRndX+rnd(storm.vMaxX*0.12,0.1);
s.vY = vRndY+rnd(storm.vMaxY*0.12,0.1);
};

this.setOpacity = function(o,opacity) {
if (!opacitySupported) {
return false;
}
o.style.opacity = opacity;
};

this.melt = function() {
if (!storm.useMeltEffect || !s.melting) {
s.recycle();
} else {
if (s.meltFrame < s.meltFrameCount) {
s.meltFrame++;
s.setOpacity(s.o,s.meltFrames[s.meltFrame]);
s.o.style.fontSize = s.fontSize-(s.fontSize*(s.meltFrame/s.meltFrameCount))+'px';
s.o.style.lineHeight = storm.flakeHeight+2+(storm.flakeHeight*0.75*(s.meltFrame/s.meltFrameCount))+'px';
} else {
s.recycle();
}
}
};

this.recycle = function() {
s.o.style.display = 'none';
s.o.style.position = (fixedForEverything?'fixed':'absolute');
s.o.style.bottom = 'auto';
s.setVelocities();
s.vCheck();
s.meltFrame = 0;
s.melting = false;
s.setOpacity(s.o,1);
s.o.style.padding = '0px';
s.o.style.margin = '0px';
s.o.style.fontSize = s.fontSize+'px';
s.o.style.lineHeight = (storm.flakeHeight+2)+'px';
s.o.style.textAlign = 'center';
s.o.style.verticalAlign = 'baseline';
s.x = parseInt(rnd(screenX-storm.flakeWidth-20),10);
s.y = parseInt(rnd(screenY)*-1,10)-storm.flakeHeight;
s.refresh();
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;
var flake = null;
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 (s.flakes[i].melting) {
s.flakes[i].melt();
}
}
if (active<s.flakesMaxActive) {
flake = s.flakes[parseInt(rnd(s.flakes.length),10)];
if (flake.active === 0) {
flake.melting = true;
}
}
};

this.mouseMove = function(e) {
if (!s.followMouse) {
return true;
}
var x = parseInt(e.clientX,10);
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),10));
if (allowInactive || i>s.flakesMaxActive) {
s.flakes[s.flakes.length-1].active = -1;
}
}
storm.targetElement.appendChild(docFrag);
};

this.timerInit = function() {
s.timers = (!isWin9X?[setInterval(s.snow,s.animationInterval)]:[setInterval(s.snow,s.animationInterval*3),setInterval(s.snow,s.animationInterval)]);
};

this.init = function() {
s.randomizeWind();
s.createSnow(s.flakesMax); // create initial batch
addEvent(window,'resize',s.resizeHandler);
addEvent(window,'scroll',s.scrollHandler);
if (!isOldIE) {
addEvent(window,'blur',s.freeze);
addEvent(window,'focus',s.resume);
}
s.resizeHandler();
s.scrollHandler();
if (s.followMouse) {
addEvent(document,'mousemove',s.mouseMove);
}
s.animationInterval = Math.max(20,s.animationInterval);
s.timerInit();
};

var didInit = false;

this.start = function(bFromOnLoad) {
if (!didInit) {
didInit = true;
} else if (bFromOnLoad) {
// already loaded and running
return true;
}
if (typeof s.targetElement == 'string') {
var targetID = s.targetElement;
s.targetElement = document.getElementById(targetID);
if (!s.targetElement) {
throw new Error('Snowstorm: Unable to get targetElement "'+targetID+'"');
}
}
if (!s.targetElement) {
s.targetElement = (!isIE?(document.documentElement?document.documentElement:document.body):document.body);
}
if (s.targetElement != document.documentElement && s.targetElement != document.body) {
s.resizeHandler = s.resizeHandlerAlt; // re-map handler to get element instead of screen dimensions
}
s.resizeHandler(); // get bounding box elements
s.usePositionFixed = (s.usePositionFixed && !noFixed); // whether or not position:fixed is supported
fixedForEverything = s.usePositionFixed;
if (screenX && screenY && !s.disabled) {
s.init();
s.active = true;
}
};

function doStart() {
s.start(true);
}

if (document.addEventListener) {
// safari 3.0.4 doesn't do DOMContentLoaded, maybe others - use a fallback to be safe.
document.addEventListener('DOMContentLoaded',doStart,false);
window.addEventListener('load',doStart,false);
} else {
addEvent(window,'load',doStart);
}

}

snowStorm = new SnowStorm();

//]]>
</script>
<!-- customize the snowStorm object -->
<script type="text/javascript">
snowStorm.snowColor = '#99ccff'; // blue-ish snow!?
snowStorm.flakesMaxActive = 96; // show more snow on screen at once
snowStorm.useTwinkleEffect = true; // let the snow flicker in and out of view
</script>

Bạn có thể dùng code sau cho nhẹ nhưng hướng bay của bông tuyết không chịu sự tác động của chuột
<script type='text/javascript'>
//<![CDATA[
var SNOW_Picture="http://2.bp.blogspot.com/-sqRmrWXtrcU/Urgz3cEa5VI/AAAAAAAAkVc/kjw2AsekkoE/s1600/snow.png";//Bông tuyết
var SNOW_no=56;//Số lượng bông tuyết
var SNOW_browser_IE_NS=(document.body.clientHeight)?1:0;
var SNOW_browser_MOZ=(self.innerWidth)?1:0;
var SNOW_browser_IE7=(document.documentElement.clientHeight)?1:0;
var SNOW_Time;
var SNOW_dx,SNOW_xp,SNOW_yp;
var SNOW_am,SNOW_stx,SNOW_sty;
var i,SNOW_Browser_Width,SNOW_Browser_Height;if(SNOW_browser_IE_NS){SNOW_Browser_Width=document.body.clientWidth;SNOW_Browser_Height=document.body.clientHeight;}else{if(SNOW_browser_MOZ){SNOW_Browser_Width=self.innerWidth-20;SNOW_Browser_Height=self.innerHeight;}else{if(SNOW_browser_IE7){SNOW_Browser_Width=document.documentElement.clientWidth;SNOW_Browser_Height=document.documentElement.clientHeight;}}}SNOW_dx=new Array();SNOW_xp=new Array();SNOW_yp=new Array();SNOW_am=new Array();SNOW_stx=new Array();SNOW_sty=new Array();for(i=0;i<SNOW_no;++i){SNOW_dx[i]=0;SNOW_xp[i]=Math.random()*(SNOW_Browser_Width-50);SNOW_yp[i]=Math.random()*SNOW_Browser_Height;SNOW_am[i]=Math.random()*20;SNOW_stx[i]=0.02+Math.random()/10;SNOW_sty[i]=0.7+Math.random();if(i==0){document.write('<\div id="SNOW_flake'+i+'" style="position: fixed; z-index: '+i+'; visibility: visible; top: 15px; left: 15px;"><img src="'+SNOW_Picture+'" border="0"></div>');}else{document.write('<\div id="SNOW_flake'+i+'" style="position: fixed; z-index: '+i+'; visibility: visible; top: 15px; left: 15px;"><img src="'+SNOW_Picture+'" border="0"></div>');}}function SNOW_Weather(){for(i=0;i<SNOW_no;++i){SNOW_yp[i]+=SNOW_sty[i];if(SNOW_yp[i]>SNOW_Browser_Height-50){SNOW_xp[i]=Math.random()*(SNOW_Browser_Width-SNOW_am[i]-30);SNOW_yp[i]=0;SNOW_stx[i]=0.02+Math.random()/10;SNOW_sty[i]=0.7+Math.random();}SNOW_dx[i]+=SNOW_stx[i];document.getElementById("SNOW_flake"+i).style.top=SNOW_yp[i]+"px";document.getElementById("SNOW_flake"+i).style.left=SNOW_xp[i]+SNOW_am[i]*Math.sin(SNOW_dx[i])+"px";}SNOW_Time=setTimeout("SNOW_Weather()",20);}SNOW_Weather();
//]]>
</script>

Tạo chữ "Merry Chrismas":
Bạn đăng nhập vào Blog > chọn Thiết kế > Thêm tiện ích HTML/Javacript rồi dán code phía dưới vào và bấm Lưu lại là xong.

<div style='position: fixed; top: 0%; right: 0%;'/><img alt="Dautocrazy.blog" src="Thay link ảnh của bạn vào đây"/></a> </div>

Nếu thích thì kết hợp cả 2 code trên.
Bấm chuột vào hình bạn thích để lấy Link thay vào Code trên nhé:

























Chúc thành công!
Nguồn: bloggertricksandtoolz.com




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