只显示百度地图上面的一个行政区域


<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<title>CanvasLayertitle>
<script type="text/javascript" src="//api.map.baidu.com/api?v=3.0&ak=您的密钥">script>
<style type="text/css">
body, html,#container {
      width: 100%;height: 100%;overflow: hidden;margin:0;font-family:"微软雅黑";}
style>
head>
<body>
    <div id="container">div>
body>
html>
<script type="text/javascript">
  var map = new BMap.Map("container",{
      minZoom : 7, maxZoom : 18 });                        // 创建Map实例
map.centerAndZoom(new BMap.Point(126.914256,47.456268), 8);     // 初始化地图,设置中心点坐标和地图级别
map.enableScrollWheelZoom();

var cityName = '黑龙江省';
map.addControl(new BMap.OverviewMapControl());              //添加缩略地图控件
map.enableScrollWheelZoom();
map.addControl(new BMap.NavigationControl({
       type: BMAP_NAVIGATION_CONTROL_LARGE ,anchor: BMAP_ANCHOR_TOP_LEFT, offset: new BMap.Size(40, 250)}));
    var bdary = new BMap.Boundary();
    bdary.get(cityName, function (rs) {
             //获取行政区域       
        var EN_JW = "180, 90;";         //东北角
        var NW_JW = "-180,  90;";       //西北角
        var WS_JW = "-180, -90;";       //西南角
        var SE_JW = "180, -90;";        //东南角
      //alert(rs.boundaries.length)
        //4.添加环形遮罩层
        var ply1 = new BMap.Polygon(rs.boundaries[1] + SE_JW + SE_JW + WS_JW + NW_JW + EN_JW + SE_JW, {
       strokeColor: "none", fillColor: "rgb(246,246,246)", fillOpacity:1, strokeOpacity: 0.5 }); //建立多边形覆盖物
        map.addOverlay(ply1);  
     });
script>

百度地图获取某个行政区域

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