网页飘雪js特效

非常棒的一个特效，让网页看起更加漂亮，美化网页必备

1. 在页面中加入css，为了测试有效果，设置了body的css样式

		body {
            width: 100%;
            height: 100%;
            background-color: #5569ae;
            overflow: hidden;
        }
        .snow-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 100001;
        }

2. 网页加上如下class的div

<div class="snow-container"></div>

3. 加入js

<script src="js/jquery-2.1.1.min.js"></script>
<script type="text/javascript" src="js/three.js"></script>
<script type="text/javascript">
    function randomRange(t, i) {
        return Math.random() * (i - t) + t
    }
    Particle3D = function (t) {
        THREE.Particle.call(this, t), this.velocity = new THREE.Vector3(0, -2, 0), this.velocity.rotateX(randomRange(-45, 45)), this.velocity.rotateY(randomRange(0, 360)), this.gravity = new THREE.Vector3(0, 0, 0), this.drag = 1
    }, Particle3D.prototype = new THREE.Particle, Particle3D.prototype.constructor = Particle3D, Particle3D.prototype.updatePhysics = function () {
        this.velocity.multiplyScalar(this.drag), this.velocity.addSelf(this.gravity), this.position.addSelf(this.velocity)
    };
    var TO_RADIANS = Math.PI / 180;
    THREE.Vector3.prototype.rotateY = function (t) {
        cosRY = Math.cos(t * TO_RADIANS), sinRY = Math.sin(t * TO_RADIANS);
        var i = this.z, o = this.x;
        this.x = o * cosRY + i * sinRY, this.z = o * -sinRY + i * cosRY
    }, THREE.Vector3.prototype.rotateX = function (t) {
        cosRY = Math.cos(t * TO_RADIANS), sinRY = Math.sin(t * TO_RADIANS);
        var i = this.z, o = this.y;
        this.y = o * cosRY + i * sinRY, this.z = o * -sinRY + i * cosRY
    }, THREE.Vector3.prototype.rotateZ = function (t) {
        cosRY = Math.cos(t * TO_RADIANS), sinRY = Math.sin(t * TO_RADIANS);
        var i = this.x, o = this.y;
        this.y = o * cosRY + i * sinRY, this.x = o * -sinRY + i * cosRY
    };
    $(function () {
        var container = document.querySelector(".snow-container");
        if (/MSIE 6|MSIE 7|MSIE 8/.test(navigator.userAgent)) {
            return
        } else {
            if (/MSIE 9|MSIE 10/.test(navigator.userAgent)) {
                $(container).css("height", $(window).height()).bind("click", function () {
                    $(this).fadeOut(1000, function () {
                        $(this).remove()
                    })
                })
            }
        }
        var containerWidth = $(container).width();
        var containerHeight = $(container).height();
        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();
        particleImage.src = "img/snow.png";
        var snowNum = 500;

        function init() {
            camera = new THREE.PerspectiveCamera(75, containerWidth / containerHeight, 1, 10000);
            camera.position.z = 1000;
            scene = new THREE.Scene();
            scene.add(camera);
            renderer = new THREE.CanvasRenderer();
            renderer.setSize(containerWidth, containerHeight);
            var material = new THREE.ParticleBasicMaterial({map: new THREE.Texture(particleImage)});
            for (var i = 0; i < snowNum; 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 / 40)
        }

        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) * 0.005;
            camera.position.y += (-mouseY - camera.position.y) * 0.005;
            camera.lookAt(scene.position);
            renderer.render(scene, camera)
        }

        init()
    });
</script>

注意：以上的js 51行需要加入一张雪花的图片的路径

4. 网页源码资料网盘链接：
   链接：https://pan.baidu.com/s/1T5aSlU1-OUJBzabceda_pA

   提取码：iprm