Three.js画布渲染，渐变背景色，鼠标动态变化效果，做个网站背景挺不错的

引入jQ：<script src="js/jquery-1.10.2.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r67/three.min.js"></script>
<div>
</div>

<style>
/* gradient fallbacks taken from csstricks.com */
body {
  background-color: red;
  
  /* SVG fallback for IE 9 (could be data URI, or could use filter) */
  background-image: url(fallback-gradient.svg);
  
  /* Safari 4, Chrome 1-9, iOS 3.2-4.3, Android 2.1-3.0 */
  background-image: -webkit-gradient(linear, left top, right top, from(red), to(#f06d06));
  
  /* Safari 5.1, iOS 5.0-6.1, Chrome 10-25, Android 4.0-4.3 */
  background-image: -webkit-linear-gradient(left, red, #f06d06);
  
  /* Firefox 3.6 - 15 */
  background-image: -moz-linear-gradient(left, red, #f06d06);
  
  /* Opera 11.1 - 12 */
  background-image: -o-linear-gradient(left, red, #f06d06);
  
  /* Opera 15+, Chrome 25+, IE 10+, Firefox 16+, Safari 6.1+, iOS 7+, Android 4.4+ */
  background-image: linear-gradient(to right, red, #f06d06);
  margin: 0px;
  overflow: hidden;
}
</style>

<script>
var mouseX = 0,
      mouseY = 0,
      windowHalfX = window.innerWidth / 2,
      windowHalfY = window.innerHeight / 2,
      SEPARATION = 200,
      AMOUNTX = 10,
      AMOUNTY = 10,
      camera,
      scene,
      renderer;
  
  init();
  animate();

    function init() {

      var container,
        separation = 100,
        amountX = 50,
        amountY = 50,
        particle;
    
    container = document.createElement( 'div' );
    document.body.appendChild( container );

    scene = new THREE.Scene();

    renderer = new THREE.CanvasRenderer({ alpha: true }); // gradient; this can be swapped for WebGLRenderer
    renderer.setSize( window.innerWidth, window.innerHeight );
    container.appendChild( renderer.domElement );
    
    camera = new THREE.PerspectiveCamera(
        75,
      window.innerWidth / window.innerHeight,
      1,
      10000
    );
    camera.position.z = 100;

        // particles
    var PI2 = Math.PI * 2;
    var material = new THREE.SpriteCanvasMaterial({
        color: 0xffffff,
        program: function ( context ) {
                context.beginPath();
        context.arc( 0, 0, 0.5, 0, PI2, true );
        context.fill();
      }
    });
    
    var geometry = new THREE.Geometry();

    for ( var i = 0; i < 100; i ++ ) {
      particle = new THREE.Sprite( material );
      particle.position.x = Math.random() * 2 - 1;
      particle.position.y = Math.random() * 2 - 1;
      particle.position.z = Math.random() * 2 - 1;
      particle.position.normalize();
      particle.position.multiplyScalar( Math.random() * 10 + 450 );
      particle.scale.x = particle.scale.y = 10;
      scene.add( particle );
      geometry.vertices.push( particle.position );
    }

    // lines
    var line = new THREE.Line( geometry, new THREE.LineBasicMaterial( { color: 0xffffff, opacity: 0.5 } ) );
    scene.add( line );

    // mousey
    document.addEventListener( 'mousemove', onDocumentMouseMove, false );
        document.addEventListener( 'touchstart', onDocumentTouchStart, false );
    document.addEventListener( 'touchmove', onDocumentTouchMove, false );
        
         window.addEventListener( 'resize', onWindowResize, false );

    } // end init();

    function onWindowResize() {

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

    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();

    renderer.setSize( window.innerWidth, window.innerHeight );

    }

    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 animate() {
    
        requestAnimationFrame( animate );
    render();
    
    }

    function render() {
        
    camera.position.x += ( mouseX - camera.position.x ) * .05;
    camera.position.y += ( - mouseY + 200 - camera.position.y ) * .05;
    camera.lookAt( scene.position );

    renderer.render( scene, camera );
  
  }
</script>