Javascript - Một số hiệu ứng tuyết rơi cho web (sưu tầm)

Javascript - Một số hiệu ứng tuyết rơi cho web (sưu tầm)

Posted by Chip at 06/12/2010 09:09 PM in HTML, CSS, JavaScript | 0 comment | 4,319 views
1 - Hiệu ứng 1
- Hiệu ứng tuyết rơi sử dụng dấu * để làm tuyết, có thể thay đổi kích cỡ, màu sắc ở phần config
Coppy đoạn code bên dưới và chèn vào dưới thẻ trong trang web của bạn
// CREDITS: // Snowmaker Copyright (c) 2003 Peter Gehrig. All rights reserved. // Distributed by http://www.hypergurl.com // Permission given to use the script on webpages provided that this notice remains as is. // Set the number of snowflakes (more than 30 - 40 not recommended) var snowmax=35 // Set the colors for the snow. Add as many colors as you like var snowcolor=new Array("#aaaacc","#ddddFF","#ccccDD") // Set the fonts, that create the snowflakes. Add as many fonts as you like var snowtype=new Array("Arial Black","Arial Narrow","Times","Comic Sans MS") // Set the letter that creates your snowflake (recommended:*) var snowletter="*" // Set the speed of sinking (recommended values range from 0.3 to 2) var sinkspeed=0.6 // Set the maximal-size of your snowflaxes var snowmaxsize=22 // Set the minimal-size of your snowflaxes var snowminsize=8 // Set the snowing-zone // 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=3 /////////////////////////////////////////////////////////////////////////// // CONFIGURATION ENDS HERE /////////////////////////////////////////////////////////////////////////// // 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&&!browse rinfos.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.clientHeight marginright = document.body.clientWidth } else if (ns6) { marginbottom = window.innerHeight marginright = window.innerWidth } 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 snow[i].style.color=snowcolor[randommaker(snowcolor.length)] 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 snow[i].style.top=snow[i].posy } 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]); snow[i].style.top=snow[i].posy 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(""+snowletter+"") } if (browserok) { window.onload=initsnow }

2 - Hiệu ứng 2
- Hiệu ứng tuyết rơi sử dụng ảnh
- Tải hình ảnh tuyết rơi ở đây ( có nhiều kiểu để chọn )
mediafire.com g79le58ol8o5rer

var SNOW_Picture = "/billeder/snow.gif"; var SNOW_no = 15; 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: absolute; 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: absolute; 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()", 10); } SNOW_Weather();

3 - Hiệu ứng 3
- Hiệu ứng tuyết bay theo chiều gió (bay theo con trỏ chuột)
if ((document.getElementById) && window.addEventListener || window.attachEvent){ (function(){ //Configure here. var num = 60; //Number of flakes var timer = 30; //setTimeout speed. Varies on different comps //End. var y = []; var x = []; var fall = []; var theFlakes = []; var sfs = []; var step = []; var currStep = []; var h,w,r; var d = document; var pix = "px"; var domWw = (typeof window.innerWidth == "number"); var domSy = (typeof window.pageYOffset == "number"); var idx = d.getElementsByTagName('div').length; if (d.documentElement.style && typeof d.documentElement.style.MozOpacity == "string") num = 12; for (i = 0; i < num; i++){ sfs[i] = Math.round(1 + Math.random() * 1); document.write(' <\/div>'); currStep[i] = 0; fall[i] = (sfs[i] == 1)? Math.round(2 + Math.random() * 2): Math.round(3 + Math.random() * 2); step[i] = (sfs[i] == 1)? 0.05 + Math.random() * 0.1 : 0.05 + Math.random() * 0.05 ; } if (domWw) r = window; else{ if (d.documentElement && typeof d.documentElement.clientWidth == "number" && d.documentElement.clientWidth != 0) r = d.documentElement; else{ if (d.body && typeof d.body.clientWidth == "number") r = d.body; } } function winsize(){ var oh,sy,ow,sx,rh,rw; if (domWw){ if (d.documentElement && d.defaultView && typeof d.defaultView.scrollMaxY == "number"){ oh = d.documentElement.offsetHeight; sy = d.defaultView.scrollMaxY; ow = d.documentElement.offsetWidth; sx = d.defaultView.scrollMaxX; rh = oh-sy; rw = ow-sx; } else{ rh = r.innerHeight; rw = r.innerWidth; } h = rh - 2; w = rw - 2; } else{ h = r.clientHeight - 2; w = r.clientWidth - 2; } } function scrl(yx){ var y,x; if (domSy){ y = r.pageYOffset; x = r.pageXOffset; } else{ y = r.scrollTop; x = r.scrollLeft; } return (yx == 0)?y:x; } function snow(){ var dy,dx; for (i = 0; i < num; i++){ dy = fall[i]; dx = fall[i] * Math.cos(currStep[i]); y[i]+=dy; x[i]+=dx; if (x[i] >= w || y[i] >= h){ y[i] = -10; x[i] = Math.round(Math.random() * w); fall[i] = (sfs[i] == 1)? Math.round(2 + Math.random() * 2): Math.round(3 + Math.random() * 2); step[i] = (sfs[i] == 1)? 0.05 + Math.random() * 0.1 : 0.05 + Math.random() * 0.05 ; } theFlakes[i].top = y[i] + scrl(0) + pix; theFlakes[i].left = x[i] + scrl(1) + pix; currStep[i]+=step[i]; } setTimeout(snow,timer); } function init(){ winsize(); for (i = 0; i < num; i++){ theFlakes[i] = document.getElementById("flake"+(idx+i)).style; y[i] = Math.round(Math.random()*h); x[i] = Math.round(Math.random()*w); } snow(); } if (window.addEventListener){ window.addEventListener("resize",winsize,false); window.addEventListener("load",init,false); } else if (window.attachEvent){ window.attachEvent("onresize",winsize); window.attachEvent("onload",init); } })(); }//End.

Nguồn: http://thuthuat.chiplove.biz/?p-787/...#ixzz1Roklv21Z