[Share] Code hiệu ứng rơi - By.South Yanr

by **South Yanr** Fri Aug 23, 2013 10:16 am

Demo:

Code:: http://southyanr.tk/

Code:

Code:: <script> var pictureSrc ="http://taigame88.mobi/anh-game-88/6b_gif_icon305.gif"; //the location of the snowflakes var pictureWidth = 30; //the width of the snowflakes var pictureHeight = 30; //the height of the snowflakes var numFlakes = 10; //the number of snowflakes var downSpeed = 0.01; //the falling speed of snowflakes (portion of screen per 100 ms) var lrFlakes = 10; //the speed that the snowflakes should swing from side to side if( typeof( numFlakes ) != 'number' || Math.round( numFlakes ) != numFlakes || numFlakes < 1 ) { numFlakes = 10; } //draw the snowflakes for( var x = 0; x < numFlakes; x++ ) { if( document.layers ) { //releave NS4 bug document.write('<layer id="snFlkDiv'+x+'"><imgsrc="'+pictureSrc+'" height="'+pictureHeight+'"width="'+pictureWidth+'" alt="*" border="0"></layer>'); } else { document.write('<div style="position:absolute;"id="snFlkDiv'+x+'"><img src="'+pictureSrc+'"height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*"border="0"></div>'); } } //calculate initial positions (in portions of browser window size) var xcoords = new Array(), ycoords = new Array(), snFlkTemp; for( var x = 0; x < numFlakes; x++ ) { xcoords[x] = ( x + 1 ) / ( numFlakes + 1 ); do { snFlkTemp = Math.round( ( numFlakes - 1 ) * Math.random() ); } while( typeof( ycoords[snFlkTemp] ) == 'number' ); ycoords[snFlkTemp] = x / numFlakes; } //now animate function flakeFall() { if( !getRefToDivNest('snFlkDiv0') ) { return; } var scrWidth = 0, scrHeight = 0, scrollHeight = 0, scrollWidth = 0; //find screen settings for all variations. doing this every time allows for resizing and scrolling if( typeof( window.innerWidth ) == 'number' ) { scrWidth = window.innerWidth; scrHeight = window.innerHeight; } else { if( document.documentElement && (document.documentElement.clientWidth ||document.documentElement.clientHeight ) ) { scrWidth = document.documentElement.clientWidth; scrHeight = document.documentElement.clientHeight; } else { if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) { scrWidth = document.body.clientWidth; scrHeight = document.body.clientHeight; } } } if( typeof( window.pageYOffset ) == 'number' ) { scrollHeight = pageYOffset; scrollWidth = pageXOffset; } else { if( document.body && ( document.body.scrollLeft ||document.body.scrollTop ) ) { scrollHeight = document.body.scrollTop;scrollWidth = document.body.scrollLeft; } else { if(document.documentElement && (document.documentElement.scrollLeft ||document.documentElement.scrollTop ) ) { scrollHeight =document.documentElement.scrollTop; scrollWidth =document.documentElement.scrollLeft; } } } //move the snowflakes to their new position for( var x = 0; x < numFlakes; x++ ) { if( ycoords[x] * scrHeight > scrHeight - pictureHeight ) { ycoords[x] = 0; } var divRef = getRefToDivNest('snFlkDiv'+x); if( !divRef ) { return; } if( divRef.style ) { divRef = divRef.style; } var oPix = document.childNodes ? 'px' : 0; divRef.top = ( Math.round( ycoords[x] * scrHeight ) + scrollHeight ) + oPix; divRef.left = ( Math.round( ( ( xcoords[x] * scrWidth ) - (pictureWidth / 2 ) ) + ( ( scrWidth / ( ( numFlakes + 1 ) * 4 ) ) * (Math.sin( lrFlakes * ycoords[x] ) - Math.sin( 3 * lrFlakes * ycoords[x]) ) ) ) + scrollWidth ) + oPix; ycoords[x] += downSpeed; } } //DHTML handlers function getRefToDivNest(divName) { if( document.layers ) { return document.layers[divName]; } //NS4 if( document[divName] ) { return document[divName]; } //NS4 also if( document.getElementById ) { return document.getElementById(divName); } //DOM (IE5+, NS6+, Mozilla0.9+, Opera) if( document.all ) { return document.all[divName]; } //Proprietary DOM - IE4 return false; } window.setInterval('flakeFall();',100);</script>

Nguồn :

Code:: http://southyanr.tk/