`var map = new ol.Map({
// layers: layers,
// layers: [vecLayer, cvaLayer,gxlayer],
target: "container",
view: new ol.View({
center: [109.039943,23.780085],
projection: projection,
zoom: 7,
minZoom: 4,
maxZoom: 14,
})
});`
怎么动态的切换上面的layers属性;我知道有一个map.addLayer
可以添加但是添加之后我怎么来改变
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