arcgis for js 绘制多边形，并在多边形内部显示文字

刚开始接触arcgis for js 不久，画个矩形都折腾半天，现在汇总一下，方便以后使用，也算是总结一下

const graLayer = new GraphicsLayer();
//设置线的样式
const symbol = new SimpleFillSymbol().setColor(null).outline.setColor("#53dcfd");
//创建线对象
const polygon = new Polygon(new SpatialReference({ wkid: 4326 }));
var point = [
          [
                112.00000000020009,
                21.000000000399893
            ], [
                112.00000000020009,
                20.499999999600448
            ], [
                112.50000000010016,
                20.499999999600448
            ], [
                113.00000000000034,
                20.499999999600448
            ], [
                113.49999999990041,
                20.499999999600448
            ], [
                113.99999999980048,
                20.499999999600448
            ], [
                114.49999999970055,
                20.499999999600448
            ], [
                114.49999999970055,
                19.999999999700378
            ],
   ]

 polygon.addRing(point);
 var graphic = new Graphic(polygon, symbol);
 graLayer.add(graphic);
 map.addLayer(graLayer);
 //添加多边形的各个角的顶点坐标,注意：首尾要链接,也就是说,第一个点和最后一个点要一致

绘制文字

var point = new Point([114.49999999970055, 19.999999999700378]);
var textSym = new TextSymbol("hello world");
var font = new Font();
font.setSize("14pt");
font.setWeight(Font.WEIGHT_BOLD);
textSym.setFont(font);
textSym.setColor(new Color([255, 0, 0, 0.8]));
var labelPointGraphic = new Graphic(point, textSym);
graLayer.add(labelPointGraphic)
map.addLayer(graLayer)