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var sfs = new esri.symbol.SimpleFillSymbol().setColor(null).outline.setColor("blue");
var geometry= new esri.geometry.Point(x, y, map.spatialReference);
var radius = map.extent.getWidth() / 10;
var circleGeometry = new esri.geometry.Circle({ center: [geometry.getLongitude(), geometry.getLatitude()],
radius: radius,
});
var graphicpoint = new esri.Graphic(circleGeometry, sfs);
graphicDrawLayer.add(graphicpoint); //用默认的图层添加