地图上点一个，告诉你所在地点，距离哪多远

先看看效果：

再贴代码：
var map = new BMap.Map("map");
map.centerAndZoom(new BMap.Point(116.404, 39.915), 16);
var geocoder = new BMap.Geocoder();
var locationOptions = {
poiRadius: 300
}
map.addEventListener("click", function(e){
var pt = e.point;
geocoder.getLocation(pt, function(result){
    if (result){
      var description = result.address;
      if (result.surroundingPois[0]){
        var poi = result.surroundingPois[0];
        description += "，" +
                       poi.title + "向" + getDirDescription(result.point, poi.point) + " " +
                       Math.round(map.getDistance(result.point, poi.point)) + "米。"
      }
      alert(description);
    }
}, locationOptions)
});
/**
* 获取两点东西南北的位置关系
*/
function getDirDescription(pt1, pt2){
var h = pt1.lng - pt2.lng;
var v = pt1.lat - pt2.lat;
if (Math.abs(h) > Math.abs(v)){
    if (h < 0){
      return "西";
    }
    else {
      return "东";
    }
}
else {
    if (v < 0){
      return "南";
    }
    else {
      return "北";
    }
}
}