Leaflet 使用模块模式在传单地图对象上运行方法

我试图将所有map函数封装到一个函数中，以便可以在应用程序中的其他位置执行map函数。我的模块的所有函数都在一个私有变量map上运行，这个私有变量map就是map对象。我遇到了一个条件语句的问题，该语句在将该层添加到地图之前检查是否存在贴图层对象邻域\多边形\层，以便在重新加载时不会复制该层（如果该层已存在）。map对象仅累积重复的图层对象，但map.hasLayer除外；函数从不在条件语句中检测这些对象。这就好像在将这些对象添加到地图后，可变邻域\多边形\层会松开对其对象的引用，从而允许再次执行该函数

var sbk = sbk || {};

sbk.map = (function () {

    var map = L.mapbox.map('map', '[redacted map id]');

    return {

        render_neighborhood_polygons: function(polygonNeighborhoods, storyNeighborhoods, neighborhoods){
                var neighborhoodPolygons = [];
                var neighborhoodsIntersection = _.intersection(polygonNeighborhoods, storyNeighborhoods);
                neighborhoodsIntersection.forEach(function (neighborhood) {
                        neighborhoodPolygons.push(neighborhoods.get(neighborhood).attributes);
                });
                var neighborhood_polygon_layer = L.geoJson(neighborhoodPolygons);

            if(!map.hasLayer(neighborhood_polygon_layer)) {
                neighborhood_polygon_layer.addTo(map);
            }
    };
} ());

这就好像在将这些对象添加到地图后，可变邻域\多边形\层会松开对其对象的引用，从而允许再次执行该函数

var sbk = sbk || {};

sbk.map = (function () {

    var map = L.mapbox.map('map', '[redacted map id]');

    return {

        render_neighborhood_polygons: function(polygonNeighborhoods, storyNeighborhoods, neighborhoods){
                var neighborhoodPolygons = [];
                var neighborhoodsIntersection = _.intersection(polygonNeighborhoods, storyNeighborhoods);
                neighborhoodsIntersection.forEach(function (neighborhood) {
                        neighborhoodPolygons.push(neighborhoods.get(neighborhood).attributes);
                });
                var neighborhood_polygon_layer = L.geoJson(neighborhoodPolygons);

            if(!map.hasLayer(neighborhood_polygon_layer)) {
                neighborhood_polygon_layer.addTo(map);
            }
    };
} ());

否:

这将创建一个名为“邻域\多边形\层”的新层，并查看它是否在带有hasLayer的地图中。此图层将永远不会出现在地图中，因为您刚刚创建了它：图层不是===其中的数据。如果您只想运行此函数一次，可以在初始化时执行，创建一个布尔标志，指示它以前是否运行过，或者不要多次运行