在 openlayers 代码中添加visibility: false 的位置？

Question

我想知道在下面的代码中哪里可以添加 visibility: false ： 就像第二个代码一样？

var line_10 = new OpenLayers.Layer.GML("Line nr-10", 
    "lines/line_10.kml",
    {
        format: OpenLayers.Format.KML,
        style: {strokeWidth: 4, strokeColor: "#f08080", fillOpacity: 1 },
        projection: map.displayProjection
    }
);

第二个代码：

var linja4_2 = new OpenLayers.Layer.Vector("Line nr-4 stations", {
    projection: map.displayProjection,
    strategies: [new OpenLayers.Strategy.Fixed()],
    protocol: new OpenLayers.Protocol.HTTP({
        url: "/data/linja-nr4.kml",
        format: new OpenLayers.Format.KML({
            extractStyles: true,
            extractAttributes: true
        })
    }),
    visibility: false
});

Answer 1

如果我没记错的话，我会将 visibility 放在这里：

var line_10 = new OpenLayers.Layer.GML("Line nr-10", 
    "lines/line_10.kml",
    {
        format: OpenLayers.Format.KML,
        style: {strokeWidth: 4, strokeColor: "#f08080", fillOpacity: 1 },
        projection: map.displayProjection
    }, {
        visibility: false
    }
);

或者按照评论中的建议：

var line_10 = new OpenLayers.Layer.GML("Line nr-10", 
    "lines/line_10.kml",
    {
        format: OpenLayers.Format.KML,
        style: {strokeWidth: 4, strokeColor: "#f08080", fillOpacity: 1 },
        projection: map.displayProjection
    }
);
line_10.setVisibility(false);