sium.js等其他资源，注意ready()返回一个Promise对象。
        XE.ready().then(startup);

        async function createGroundCircle(earth) {
            var p = new XE.Obj.CustomGroundRectangle(earth)
            p.position = [2.02729390339372, 0.6980810742548738, 755.036813823199];
            p.width = 3000;
            p.height = 3000;
            p.canvasWidth = 512;
            p.canvasHeight = 512;

            // var htmlText = `
            //     <div style="width: 512px; he