百度地图api，searchNearby和searchInBounds

周边搜索

var map = new BMap.Map("container");  
map.centerAndZoom(new BMap.Point(116.404, 39.915), 11);  
var local = new BMap.LocalSearch(map, {  
 renderOptions:{map: map, autoViewport: true}  
});  
local.searchNearby("小吃", "前门");

范围搜索

var map = new BMap.Map("container");  
map.centerAndZoom(new BMap.Point(116.404, 39.915), 14);  
var local = new BMap.LocalSearch(map, {  
 renderOptions:{map: map}  
});  
local.searchInBounds("银行", map.getBounds());  

searchNearby("小吃", new BMap.Point(116.404, 39.915),1000)也是可以的。

更多技术可见

http://developer.baidu.com/map/index.php?title=jspopular

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