ArcGIS API for JavaScript根据两个点坐标在地图上画线
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var polyline = new esri.geometry.Polyline([[xxx,xxx],[xxx,xxx]]);
var symbol = new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,255,0]), 2);
var graphic = new esri.Graphic(polyline, symbol);
map.graphics.add(graphic);
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