NJ API for Cesium GeoAnimationManager

Example:

var singleArrowElement = new Cesium.GeoSingleArrowElement({
		viewer: viewer,
		positions: [
			[106.50255907979172, 30.124293956577112],
			[109.57560428200443, 28.695531735044707],
			[112.19039125075413, 29.356410433383108],
			[114.08748761156725, 30.56765059559664]
		],
		lineColor: new Cesium.Color(0, 1, 1, 1),
		lineWidth: 5,
		lineStyle: GeoElement.LINE_STYLE.SOLID,
		fillMode: "gradient", //gradient
		fillColor: new Cesium.Color(0, 0, 1, 1),
		fillStartColor: new Cesium.Color(0, 0, 1, 1),
		fillEndColor: new Cesium.Color(0, 1, 0, 1),
		visibleSwallowTail: true
	})

	var animation = new Cesium.GeoAnimationGrow({
		name: '单箭头，多途径点的动画',
		startTime: 0,
		duration: 5,
		element: singleArrowElement
	})

	var doubleArrowElement = new Cesium.GeoDoubleArrowElement({
		viewer: viewer,
		positions: [
			[114.32672638334496, 34.06526265570961],
			[118.58435074139295, 32.17305709060316],
			[115.19719950610559, 30.354446348688],
			[113.72546321786797, 31.234367143944176]
		],
		lineColor: new Cesium.Color(0, 1, 1, 1),
		lineWidth: 1,
		lineStyle: GeoElement.LINE_STYLE.SOLID,
		fillMode: "gradient",
		fillColor: new Cesium.Color(0, 0, 1, 1),
		fillStartColor: new Cesium.Color(0, 0, 1, 1),
		fillEndColor: new Cesium.Color(0, 1, 0, 1),
		visibleSwallowTail: true
	})

	var animation2 = new Cesium.GeoAnimationGrow({
		name: '双箭头，多途径点的动画',
		startTime: 0,
		duration: 5,
		element: doubleArrowElement
	});

	let animationManager = new Cesium.GeoAnimationManager({
		animations: [animation, animation2]
	}); 
 animationManager.play();