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並前往https://gis.stackexchange.com/questions/208989/how-to-test-if-a-layer-exist-in-a-mapbox-gl-js-map

How to test if a layer exist in a MapBox GL JS map? - GIS ...

Better way: var mapLayer = map.getLayer('route'); if(typeof mapLayer !== 'undefined') { // Remove map layer & source. map.removeLayer('route').

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