OpenLayers-地图拒绝最大化缩放

Question

If been changing round some OpenLayers code, and one side effect is that by Google Street base layer no longer displays a sensible map, but instead zooms out to a 3 x world view. Nothing I put into the code which the api suggests should work does.

The same code - but rearranged - worked OK in the past (but didn't allow the bigger picture to work unfortunately)

I'm new to all this and way out of my comfort zone so a sanity check of the code would be much appreciated:

    function ProfileMap(mapName)
    {
        this.name = mapName;
        this.layers = [];

        // define Map options
        var mapoptions = {
                projection: mercator,
                units: "m",
                maxExtent: world
        };

        // define Base Layer
        var baselayer = new OpenLayers.Layer.Google(
                "Google Streets", 
                {numZoomLevels: 20, spehericalMercator: 2}
        );  


        this.init = function(mapdiv, keydiv)
        {
            var layerswitcher = new OpenLayers.Control.LayerSwitcher(
                    {div: document.getElementById(keydiv)}
            );      

            this.map = new OpenLayers.Map(mapdiv, mapoptions);
            this.map.addLayer(baselayer);
            this.map.setCenter(mapcenter);
            this.map.zoomToMaxExtent();

        };

        this.addMapLayer = function(layerName)
        {
            var layerid = this.layers.length;
            this.layers[layerid] = new OpenLayers.Layer.Markers(layerName);
            this.map.addLayer(this.layers[layerid]);
        }

    }


    // Map actually created by a call to this function
    function createMap(mapName, div, keydiv, mapLayers)
    {
        mapName = new ProfileMap(mapName);
        mapName.init(div, keydiv);
        for(var i=0; i < mapLayers.length; i++)
        {
            mapName.addMapLayer(mapLayers[i]);
        }

    }

Answer 1

One thing it could be is that you've misspelled sphericalMercator . Also it takes in a boolean value, not numeric.

sphericalMercator: true

Reference

Update #1:

Please change this:

var mapoptions = {
    projection: mercator,
    units: "m",
    maxExtent: world
};

for this:

var mapoptions = {
    projection: new OpenLayers.Projection("EPSG:900913"),
    units: "m",
    maxExtent: world
};