唯美雪景雪花飘落代码，

效果演示;

包括一个index.html代码+两个js代码+图片文件夹

简单的来说不是很难，主要就是以理解为主，修改index里面的文字内容，以及图片的替换，js 的代码不需要改动

index代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <title>唯美雪景雪花飘落效果代码</title>

 <style type="text/css">
 body {
 background-color:#000044;
 background:url(images/bg.jpg) repeat-x;
 margin:0px;
 overflow:hidden;
 }
 a {
 color:#0078ff;
 }
 </style>

 </head>
 <body onLoad="init()">

 <script type="text/javascript" src="js/ThreeCanvas.js"></script>
 <script type="text/javascript" src="js/Snow.js"></script>
 <script type="text/javascript">
 var SCREEN_WIDTH = window.innerWidth;
 var SCREEN_HEIGHT = window.innerHeight;

 var container;

 var particle;

 var camera;
 var scene;
 var renderer;

 var mouseX = 0;
 var mouseY = 0;

 var windowHalfX = window.innerWidth / 2;
 var windowHalfY = window.innerHeight / 2;

 var particles = [];
 var particleImage = new Image();//THREE.ImageUtils.loadTexture( "img/ParticleSmoke.png" );
 particleImage.src = 'images/ParticleSmoke.png';



 function init() {

 container = document.createElement('div');
 document.body.appendChild(container);

 camera = new THREE.PerspectiveCamera( 75, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
 camera.position.z = 1000;

 scene = new THREE.Scene();
 scene.add(camera);

 renderer = new THREE.CanvasRenderer();
 renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
 var material = new THREE.ParticleBasicMaterial( { map: new THREE.Texture(particleImage) } );

 for (var i = 0; i < 500; i++) {

 particle = new Particle3D( material);
 particle.position.x = Math.random() * 2000 - 1000;
 particle.position.y = Math.random() * 2000 - 1000;
 particle.position.z = Math.random() * 2000 - 1000;
 particle.scale.x = particle.scale.y = 1;
 scene.add( particle );

 particles.push(particle);
 }

 container.appendChild( renderer.domElement );


 document.addEventListener( 'mousemove', onDocumentMouseMove, false );
 document.addEventListener( 'touchstart', onDocumentTouchStart, false );
 document.addEventListener( 'touchmove', onDocumentTouchMove, false );

 setInterval( loop, 1000 / 60 );

 }

 function onDocumentMouseMove( event ) {

 mouseX = event.clientX - windowHalfX;
 mouseY = event.clientY - windowHalfY;
 }

 function onDocumentTouchStart( event ) {

 if ( event.touches.length == 1 ) {

 event.preventDefault();

 mouseX = event.touches[ 0 ].pageX - windowHalfX;
 mouseY = event.touches[ 0 ].pageY - windowHalfY;
 }
 }

 function onDocumentTouchMove( event ) {

 if ( event.touches.length == 1 ) {

 event.preventDefault();

 mouseX = event.touches[ 0 ].pageX - windowHalfX;
 mouseY = event.touches[ 0 ].pageY - windowHalfY;
 }
 }

 //

 function loop() {

 for(var i = 0; i<particles.length; i++)
 {

 var particle = particles[i];
 particle.updatePhysics();

 with(particle.position)
 {
 if(y<-1000) y+=2000;
 if(x>1000) x-=2000;
 else if(x<-1000) x+=2000;
 if(z>1000) z-=2000;
 else if(z<-1000) z+=2000;
 }
 }

 camera.position.x += ( mouseX - camera.position.x ) * 0.05;
 camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
 camera.lookAt(scene.position);

 renderer.render( scene, camera );


 }
 </script>
 <div style="text-align:center;">
 </div>
 </body>
 </html>