Particle3D=function(material){
    THREE.Particle.call(this,material);
    this.velocity=new THREE.Vector3(4,-4,1);//閫熷害;
    //this.velocity.rotateX(2);//鏃嬭浆;
    this.gravity=new THREE.Vector3(0,0,0);//鍔犻€熷害;
    this.drag=1;//閫熷害鐩镐箻绯绘暟;
};
//Particle:绮掑瓙;
//prototype:鍘熷舰;
Particle3D.prototype=new THREE.Particle();
Particle3D.prototype.constructor=Particle3D;//鏋勯€犲嚱鏁�
Particle3D.prototype.updatePhysics=function(){
    this.velocity.multiplyScalar(this.drag);//鐭㈤噺鐩镐箻鍑芥暟
    this.velocity.addSelf(this.gravity);//鐭㈤噺鐩稿姞鍑芥暟
    this.position.addSelf(this.velocity);//鐭㈤噺鐩稿姞鍑芥暟
}
var TO_RADIANS=Math.PI/180;//瑙掑害鍚戝姬搴﹁浆鎹㈢郴鏁�*
THREE.Vector3.prototype.rotateY=function(angle){
    //缁昚杞撮『鏃堕拡鏃嬭浆angle;
    cosRY=Math.cos(angle*TO_RADIANS);
    sinRY=Math.sin(angle*TO_RADIANS);
    var tempz=this.z;
    var tempx=this.x;
    this.x=(tempx*cosRY)+(tempz*sinRY);
    this.z=(tempx*-sinRY)+(tempz*cosRY);
}
THREE.Vector3.prototype.rotateX=function(angle){
    //缁昘杞撮『鏃堕拡鏃嬭浆angle;
    cosRY=Math.cos(angle*TO_RADIANS);
    sinRY=Math.sin(angle*TO_RADIANS);
    var tempz=this.z;;
    var tempy=this.y;
    this.y=(tempy*cosRY)+(tempz*sinRY);
    this.z=(tempy*-sinRY)+(tempz*cosRY);
}
THREE.Vector3.prototype.rotateZ=function(angle){
    //缁昛杞撮『鏃堕拡鏃嬭浆angle;
    cosRY=Math.cos(angle*TO_RADIANS);
    sinRY=Math.sin(angle*TO_RADIANS);
    var tempx=this.x;;
    var tempy=this.y;
    this.y=(tempy*cosRY)+(tempx*sinRY);
    this.x=(tempy*-sinRY)+(tempx*cosRY);
}
function randomRange(min,max){
    return((Math.random()*(max-min))+ min);
}
    var SCREEN_WIDTH = window.innerWidth;//
    var SCREEN_HEIGHT = window.innerHeight;
    var container;
    var particle;//绮掑瓙
    var camera;
    var scene;
    var renderer;
    var starSnow = 1;
    var particles = []; 
    var particleImage = new Image();
    //THREE.ImageUtils.loadTexture( "img/ParticleSmoke.png" );
    particleImage.src = 'https://cdn.yimian.xyz/xuehua/ParticleSmoke.png'; 
    function init() {
        //alert("message3");
        container = document.createElement('div');//container锛氱敾甯冨疄渚�;
        document.body.appendChild(container);
        camera = new THREE.PerspectiveCamera( 60, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
        camera.position.z = 1000;
        //camera.position.y = 50;
        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) } );
            //alert("message2");
        for (var i = 0; i < 500; i++) {
            //alert("message");
            particle = new Particle3D( material);
            particle.position.x = Math.random() * 2000-1000;
            particle.position.z = Math.random() * 2000-1000;
            particle.position.y = Math.random() * 2000-1000;
            //particle.position.y = Math.random() * (1600-particle.position.z)-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 );
        document.addEventListener( 'touchend', onDocumentTouchEnd, false );
        setInterval( loop, 1000 / 60 );
        
    }
    var touchStartX;
    var touchFlag = 0;//鍌ㄥ瓨褰撳墠鏄惁婊戝姩鐨勭姸鎬�;
    var touchSensitive = 80;//妫€娴嬫粦鍔ㄧ殑鐏垫晱搴�;
    //var touchStartY;
    //var touchEndX;
    //var touchEndY;
    function onDocumentTouchStart( event ) {
        if ( event.touches.length == 1 ) {

            event.preventDefault();//鍙栨秷榛樿鍏宠仈鍔ㄤ綔;
            touchStartX = 0;
            touchStartX = event.touches[ 0 ].pageX ;
            //touchStartY = event.touches[ 0 ].pageY ;
        }
    }
    function onDocumentTouchMove( event ) {

        if ( event.touches.length == 1 ) {
            event.preventDefault();
            var direction = event.touches[ 0 ].pageX - touchStartX;
            if (Math.abs(direction) > touchSensitive) {
                if (direction>0) {touchFlag = 1;}
                else if (direction<0) {touchFlag = -1;};
                //changeAndBack(touchFlag);
            }   
        }
    }
    function onDocumentTouchEnd (event) {
        // if ( event.touches.length == 0 ) {
        //  event.preventDefault();
        //  touchEndX = event.touches[ 0 ].pageX ;
        //  touchEndY = event.touches[ 0 ].pageY ;
    
        // }杩欓噷瀛樺湪闂
        var direction = event.changedTouches[ 0 ].pageX - touchStartX;

        changeAndBack(touchFlag);
    }

    function changeAndBack (touchFlag) {
        var speedX = 25*touchFlag;
        touchFlag = 0;
        for (var i = 0; i < particles.length; i++) {
            particles[i].velocity=new THREE.Vector3(speedX,-10,0);
        }
        var timeOut = setTimeout(";", 800);
        clearTimeout(timeOut);

        var clearI = setInterval(function () {
            if (touchFlag) {
                clearInterval(clearI);
                return;
            };
            speedX*=0.8;

            if (Math.abs(speedX)<=1.5) {
                speedX=0;
                clearInterval(clearI);
            };
            
            for (var i = 0; i < particles.length; i++) {
                particles[i].velocity=new THREE.Vector3(speedX,-10,0);
            }
        },100);


    }
    function loop() {
        for(var i = 0; i<particles.length; i++){
            var particle = particles[i]; 
            particle.updatePhysics(); 

            with(particle.position)
            {
                if((y<-1000)&&starSnow) {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.lookAt(scene.position); 

        renderer.render( scene, camera );
    }