如何用html+js实现3d绚丽雪花特效

1、打开记事本，由于我们要用到ThreeCanvas.js文件，所以我们先引入该文件代码如下：<script type="text/javascript" src="js/ThreeCanvas.js"></script>

2、如果没有这个文件，可以去网上下载。百度搜索ThreeCanvas.js即可下载得到。

3、为了让背景漂亮，我们先加一个背景。代码如下：body { background-color:#000044; background:url(images/bg.jpg) repeat-x; margin:0px; overflow:hidden;}a { color:#0078ff;}

4、同样我们也要用到Snow.js文件，导入这个文件。代码如下：<script type="text/javascript" src="js/Snow.js"></script>

5、如果也没有这个文件，可以去网上下载。百度搜索Snow.js即可下载得到。

6、接下来就是最重要的步骤了：核心代码的编写。首先我们声明我们需要的变量。

7、然后，编写init()函数。init()函数里写入我们想让雪花如何飘落的逻辑。

8、然后鼠标事件的编写，让效果呈现3d的效果。

9、到这里基本上已经能实现这一效果啦！点开你写的页面，就可以看见雪花效果啦。

10、这是我们需要编写的j衡痕贤伎s代码，大家可以参考下：<script> var SCREEN_WIDTH = window.inn髫潋啜缅erWidth; 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>