Cesium entity 渐隐渐显、闪烁

 点entity

function f2(){var x=1;var flog=true;//闪烁//var x=0;var flog=false;//渐显viewer.entities.add({name:"圆点point闪烁",position:Cesium.Cartesian3.fromDegrees(116.20+0.03,39.53+0.03,0),point : {show : true, // defaultcolor :new Cesium.CallbackProperty(function () {if(flog){x=x-0.05;if(x<=0){flog=false;}}else{x=x+0.05;if(x>=1){flog=true;}}return Cesium.Color.RED.withAlpha(x);},false),pixelSize : 10, // default: 1outlineWidth :0}});
}

面entity 

function f1() {var x = 1;var flog = true;viewer.entities.add({name: "圆形区域闪烁",position: Cesium.Cartesian3.fromDegrees(116.20, 39.53, 0),ellipse: {semiMinorAxis: 2000.0,semiMajorAxis: 2000.0,height: 0,material: new Cesium.ColorMaterialProperty(new Cesium.CallbackProperty(function () {if (flog) {x = x - 0.05;if (x <= 0) {flog = false;}} else {x = x + 0.05;if (x >= 1) {flog = true;}}console.log(x)return Cesium.Color.RED.withAlpha(x);}, false))}});
}