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並前往https://gis.stackexchange.com/questions/383026/remove-existing-choropleth-map-layer-legend-and-info-div-before-adding-a-new-on

Remove Existing Choropleth Map Layer, Legend and Info Div ...

The main thing that is wrong in your code is that in the function AddLayer , where you define new GeoJSON layer for newly selected month, ...

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