批量添加

let primitiveArray = []
for (let i = 0; i < 5; i ++) {
	const primitive = this.viewer.scene.primitives.add(new Cesium.Primitive())
	primitiveArray.push(primitive)
}

批量删除

const that = this
primitiveArray.forEach((e) => {
	e.readyPromise.then(function (primitive) {
		that.viewer.scene.primitives.remove(primitive);
	});
});