How delete a feature in Openlayers with `del` Key

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I'm using OpenLayers-3.8.2 for developing an GIS application. Users draw some features and can modify all existing features on map. They can delete features. I can delete feature as follow:

1. user click some features
2. User click on a button and then: layer.removeFeature(feature)

Now I want to user can remove features with del key.

What do I implement it?



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