百度地图

<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=Iduw9tkYmq95VGP4DzN6rt6SzcxL3reF"></script>

<script type="text/javascript">
    lng1 = document.getElementById(‘id_lng‘).value;
    lat1 = document.getElementById(‘id_lat‘).value;
    if(lat1 && lng1){
        var map = new BMap.Map("allmap"); //实例化一个地图对象
        var point = new BMap.Point(lng1,lat1); //设置地图中心的位置
    }
    else{
        var map = new BMap.Map("allmap"); //实例化一个地图对象
        var point = new BMap.Point(121.540999,31.300627); //设置地图中心的位置
    }

    var marker = new BMap.Marker(point);
    map.addOverlay(marker);


    map.centerAndZoom(point,12); //设置地图元素的可视层

    map.enableScrollWheelZoom();    //启用滚轮放大缩小，默认禁用
    map.enableContinuousZoom();    //启用地图惯性拖拽，默认禁用

    var gc = new BMap.Geocoder();
    gc.getLocation(point, function (rs) {
        var addComp = rs.addressComponents;
        address = addComp.province + addComp.city + addComp.district + addComp.street + addComp.streetNumber;
        var label = new BMap.Label(address, {offset: new BMap.Size(20, -10)});
        marker.setLabel(label);
    });


    //点击获取坐标
    map.addEventListener("click",function(e) {
        var allOverlay = map.getOverlays();
        for (var i = 0; i < allOverlay.length; i++) {
            map.removeOverlay(allOverlay[i]);
        }
        //存储经纬度
        lng = e.point.lng;
        lat = e.point.lat;
        //在地图上面描点
        var marker = new BMap.Marker(new BMap.Point(lng, lat));  // 创建标注
        map.addOverlay(marker);
        marker.enableDragging();    //可拖拽
        var gc = new BMap.Geocoder();
        //获取地址的数据地址
        var pt = e.point;
        gc.getLocation(pt, function (rs) {
            var addComp = rs.addressComponents;
            address = addComp.province + addComp.city + addComp.district + addComp.street + addComp.streetNumber;
            document.getElementById(‘id_address‘).value = address;
            document.getElementById(‘id_lng‘).value = lng;
            document.getElementById(‘id_lat‘).value = lat;
            //画图
            var label = new BMap.Label(address, {offset: new BMap.Size(20, -10)});
            marker.setLabel(label);
        });
    });
</script>