我试图将两个显示市政当局的geojson文件加载到谷歌地图上。一个文件显示正常。但是其他文件根本没有显示出来。我不确定为什么。我让第二个文件中只有一个形状，但它仍然没有加载。谁能告诉我为什么？
jquery的：
map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
var muniLayer = new google.maps.Data();
var countyLayer = new google.maps.Data();
muniLayer.loadGeoJson('js/neighborhoods_geojson.json');
countyLayer.loadGeoJson('js/munis_011816.json');
muniLayer.setStyle(function (feature) {
return {
strokeColor: '#000000',
strokeWeight: 2,
fillColor: '#ffffff',
strokeWeight: '1',
fillOpacity: '0',
};
});
countyLayer.setStyle({
strokeColor: 'black',
strokeWeight: 1
});
muniLayer.setMap(map);
countyLayer.setMap(map);
json文件没有显示任何内容：
{
"type":"FeatureCollection",
"features":[
{
"type":"Feature",
"geometry":{
"type":"MultiPolygon",
"coordinates":[
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}
}
]
}