                   start: 0,
                            end: 100
                        },
                        trails: 3,
                        duration: 5,
                    },
                    draw: 'simple'
                }

                var mapvLayer = XE.mixins.mapVLayer(viewer, dataSet, options);
            });


            // only for Debug
            window.earth = earth;
        }

        // 1 XE.ready()会加载Cesium.js等其他资源，注意ready()返回一个Promise对象�