百度api有提供了“添加行政区划”的示例：http://lbsyun.baidu.com/jsdemo.htm#c1_10

研究了百度行政区划实现原理，它也是存储了行政区边界点集合，显示时通过点集合绘制多边形polygon，

那我们自己也可以按照这个逻辑来实现乡镇行政区划的展示。
找到所需乡镇的边界点集合，存储起来。

添加行政区划

var polygons = [];
function getBoundary(){
var areas = [];
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var shuidaotian = "120.47836650,31.65175668;120.47969150,31.65169520;120.47973193,31.65194880;120.47988464,31.65224081;120.48069311,31.65308227;120.48101201,31.65309379;120.48119167,31.65320906;120.48115125,31.65409277;120.48379676,31.65414657;120.48340151,31.65362402;120.48439413,31.65313990;120.48441210,31.65165678;120.48827032,31.65085758;120.49152219,31.65093058;120.49162998,31.65118033;120.49242049,31.65130329;120.49137846,31.64968950;120.49113142,31.64806031;120.49109100,31.64570869;120.48532612,31.64563184;120.48361934,31.64494210;120.48261324,31.64504777;120.47936362,31.64654636;120.47837019,31.65178299;120.47837019,31.65174007;";//var luzhi = "120.87071,31.317417;120.86223,31.311;120.858924,31.301374;120.855187,31.290882;120.850588,31.288167;120.843833,31.290759;120.838802,31.294956;120.814656,31.299522;120.809769,31.291253;120.805314,31.285698;120.81135,31.280637;120.812069,31.275946;120.809338,31.273106;120.80517,31.272983;120.792809,31.274217;120.784329,31.273477;120.780592,31.268662;120.779155,31.262612;120.778005,31.254339;120.769884,31.246065;120.765716,31.247918;120.761979,31.249399;120.760111,31.247485;120.758242,31.24693;120.752637,31.245448;120.748181,31.242607;120.746097,31.239335;120.759751,31.232665;120.775562,31.224266;120.786485,31.217349;120.78476,31.211172;120.78052,31.206601;120.780664,31.200423;120.791372,31.194925;120.796762,31.193319;120.798558,31.191527;120.798918,31.189736;120.796905,31.185658;120.807326,31.179232;120.818105,31.193813;120.822992,31.198385;120.830322,31.201597;120.841964,31.20728;120.865248,31.217287;120.875309,31.213334;120.881346,31.214569;120.888964,31.215434;120.902905,31.216546;120.902905,31.220375;120.906355,31.220869;120.907217,31.22581;120.904343,31.234333;120.901899,31.240261;120.898306,31.245818;120.895144,31.244583;120.892557,31.260389;120.887095,31.273847;120.887526,31.290265;120.880915,31.290882;120.878903,31.295696;120.879334,31.299275;120.880196,31.306804;120.87804,31.311493";areas.push(ehu);areas.push(yangjian);areas.push(xibei);areas.push(donggang);areas.push(taichuangyuan);//areas.push(shuidaotian);areas.push(xishan);colors = ["#fff492", "#fff492", "#98d057", "#e19ee6", "#ffc11d", "#1ad3da"];var pointArray = [];for (var i = 0; i < areas.length; i++) {var ply = new BMap.Polygon(areas[i], { strokeWeight: 2, strokeColor: "blue" }); //建立多边形覆盖物ply.setFillColor(colors[i])   //设置多边形的填充颜色ply.setFillOpacity(0.35);polygons.push(ply);  //加入多边形数组，以之后获取多边形边界点集//if (i == 3)//{//    ply.enableEditing();  //范围可编辑 【编辑的时候开启】//}map.addOverlay(ply);  //添加覆盖物pointArray = pointArray.concat(ply.getPath());}map.setViewport(pointArray);    //调整视野  addlabel();
}setTimeout(function(){getBoundary();
}, 2000);function addlabel() {var pointArray = [new BMap.Point(120.546977,31.543821),  //鹅湖镇new BMap.Point(120.536457,31.635104),  //羊尖镇new BMap.Point(120.413425,31.676415),  //锡北镇new BMap.Point(120.512508,31.700926),  //东港镇new BMap.Point(120.468617,31.652811),  //台创园//new BMap.Point(120.484052,31.64854),//水稻田示范点new BMap.Point(120.470341,31.622806),  //锡山区];  ;var optsArray = [{}, {}, {}, {}, {}, {}, {}, {}, {}, {}];var labelArray = [];var contentArray = ["鹅湖镇", "羊尖镇", "锡北镇", "东港镇","台创园","锡山区"];//var contentArray = [//"水稻田示范点"];//var contentArray = [// "台创园"];for (var i = 0; i < pointArray.length; i++) {optsArray[i].position = pointArray[i];labelArray[i] = new BMap.Label(contentArray[i], optsArray[i]);labelArray[i].setStyle({color: "blue",fontSize: "12px",height: "20px",lineHeight: "20px",fontFamily: "微软雅黑",backgroundColor:'none',border:'none'});map.addOverlay(labelArray[i]);}
}

//获取编辑后的边界点集【编辑完后，可以通过 button 来触发这个方法】
function getpoints() {
for (var j = 0; j < polygons.length; j++) {
var polyline =polygons[j];
var pts = polyline.getPath();

        var sss = "";for (var i = 0; i < pts.length; i++) {sss += pts[i].lng + "," + pts[i].lat + ";";}console.log(sss);   //【将点集输出到控制台】}alert('已输出边界点集合!');
}

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