openlayers-local.js"></script>
    <script type="text/javascript">
        var vectorSource=null;
        var vectorLayer = null;
        var drawTool = null;
        var map = null ;
        var commonStyle = null ;
        var arrowStyle = null ; 
        function init() {
            //初始化地图容器
            map = new ol.Map({
                target: 'mapCon',     //地图容器div的ID
                controls: ol.control.defaults({
                    attributionOptions: ({
                 