1.效果图


将上面两片结合起来就OK，代码容易，但是高亮过的图层怎么消除？（扩展）

2. 贴代码
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>QueryTask</title>
    <link rel="stylesheet" href="https://js.arcgis.com/3.28/esri/css/esri.css"/>
    <link rel="stylesheet" href="https://js.arcgis.com/3.28/dijit/themes/tundra/tundra.css"/>
    <script  type="text/Javascript" src="https://js.arcgis.com/3.28/"></script>
    <style type="text/css">
        .MapClass{
            width:100%;
            height:800px;
            border:1px solid #000;
        }
    </style>
    <script type="text/javascript">

        require(["esri/map",
            "esri/layers/ArcGISDynamicMapServiceLayer",
            "dojo/dom",
            "dojo/on",
            "esri/tasks/QueryTask",
            "esri/toolbars/draw",
            "esri/tasks/query",
            "esri/symbols/SimpleLineSymbol",
            "esri/symbols/SimpleFillSymbol", 
            "esri/graphic",
            "dojo/domReady!"],
            function (Map, ArcGISDynamicMapServiceLayer,dom, on,
            QueryTask, Draw, Query,
            SimpleLineSymbol,SimpleFillSymbol,Graphic) {
                var map = new Map("mapDiv");
                var layer = new ArcGISDynamicMapServiceLayer
                ("http://localhost:6080/arcgis/rest/services/ecology/beijing_2012_3/MapServer");
                //将图层添加到地图
                map.addLayer(layer)


                //给属性查询按钮添加click事件
                on(dom.byId("Btn_sx"),"click",function(e){
                    var queryTask = new QueryTask
                    ("http://localhost:6080/arcgis/rest/services/ecology/beijing_2012_3/MapServer/0");
                    var query = new Query();
                    query.where = "FID = 2";
                    query.outFields = ["*"];
                    query.returnGeometry = true;
                    queryTask.execute(query, showQueryResult);
                })

            var toolBar = new Draw(map);
            on(dom.byId("Btn_kj"),"click",function(){
                toolBar.activate(Draw.POLYGON);
            })
            on(toolBar, "draw-complete", function (result) {
                var geometry=result.geometry;
                toolBar.deactivate();
                queryGraphic(geometry);
            });

            function queryGraphic(geometry) {
                var queryTask = new QueryTask( "http://localhost:6080/arcgis/rest/services/ecology/beijing_2012_3/MapServer/0");
                var query = new Query();
                query.geometry = geometry;
                query.outFields = ["*"];
                query.returnGeometry = true;
                queryTask.execute(query, showQueryResult);
            }

                function showQueryResult(queryResult)
                {
                    var lineSymbol=new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASH, new dojo.Color([255, 0, 0]), 3);
                    var fill=new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID, lineSymbol);
                    if (queryResult.features.length == 0) {
                        dom.byId("divShowResult").innerHTML = "";
                        return;
                    }
                    var htmls = "";
                    if (queryResult.features.length >= 1) {
                        htmls = htmls + "<table style=\"width: 100%\">";
                        htmls = htmls + "<tr><td>名称</td></tr>";
                        for (var i = 0; i < queryResult.features.length; i++) {
                            var graphic = queryResult.features[i];
                            graphic.setSymbol(fill);
                            map.graphics.add(graphic);
                            var ptName = graphic.attributes["NL_NAME_3"];
                            if (i % 2 == 0)
                                htmls = htmls + "<tr>";
                            else
                                htmls = htmls + "<tr bgcolor=\"#F0F0F0\">";
                            htmls = htmls + "<td><a href=\"#\" \">" + ptName + "</a></td>";
                            htmls = htmls + "</tr>";
                        }
                        htmls = htmls + "</table>";
                        dom.byId("divShowResult").innerHTML = htmls;
                    }
                }
            });


    </script>
</head>
<body>
    <div id="mapDiv" class="MapClass"></div>
    <input type="button" value="属性查询" id="Btn_sx"/>

    <input type="button" value="空间查询" id="Btn_kj"/>
    <div id="divShowResult"></div>
</body>
</html>