叠加显示上海效果图： 
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;}
#l-map{height:100%;width:78%;float:left;border-right:2px solid #bcbcbc;}
#r-result{height:100%;width:20%;float:left;}
</style>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=1.5&ak=0Ea24345073256b9232eddc3e8284aca"></script>
<title>叠加行政区划图</title>
</head>
<body>
<div id="allmap"></div>
</body>
</html>
<script type="text/javascript">
var map = new BMap.Map("allmap");
map.centerAndZoom(new BMap.Point(116.403765, 39.914850), 7);
map.enableScrollWheelZoom();
function getBoundary(){
var bdary = new BMap.Boundary();
bdary.get("上海", function(rs){ //获取行政区域
map.clearOverlays(); //清除地图覆盖物
var count = rs.boundaries.length; //行政区域的点有多少个
for(var i = 0; i < count; i++){
var ply = new BMap.Polygon(rs.boundaries[i], {strokeWeight: 2, strokeColor: "#ff0000"}); //建立多边形覆盖物
map.addOverlay(ply); //添加覆盖物
map.setViewport(ply.getPath()); //调整视野
}
});
}
function getBoundary2(){
var bdary = new BMap.Boundary();
bdary.get("武汉", function(rs){ //获取行政区域
map.clearOverlays(); //清除地图覆盖物
var count = rs.boundaries.length; //行政区域的点有多少个
for(var i = 0; i < count; i++){
var ply = new BMap.Polygon(rs.boundaries[i], {strokeWeight: 2, strokeColor: "red"}); //建立多边形覆盖物
map.addOverlay(ply); //添加覆盖物
map.setViewport(ply.getPath()); //调整视野
}
});
}
setTimeout(function(){
getBoundary();
getBoundary2();
}, 1500);
</script>
希望以上分享对各位朋友有些帮助，谢谢！
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