tween.js简单案例

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init();
			animate();

			function init() {

				var output = document.createElement( 'div' );
				output.style.cssText = 'position: absolute; left: 50px; top: 300px; font-size: 100px';
				document.body.appendChild( output );

				var tween = new TWEEN.Tween( { x: 50, y: 0 } )
					.to( { x: 400 }, 2000 )
					.easing( TWEEN.Easing.Elastic.InOut )
					.onUpdate( function () {

						output.innerHTML = 'x == ' + Math.round( this.x );
						var transform = 'translateX(' + this.x + 'px)';
						output.style.webkitTransform = transform;
						output.style.transform = transform;

					} )
					.start();

			}

			function animate( time ) {

				requestAnimationFrame( animate );
				TWEEN.update( time );

			}