How the ng-zorro tree control gets the nodes selected by the current checkBox

use version 0.7.0-beta.3
to get information about all selected nodes

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apiNzFormatEmitEventpropscheckedKeys?

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I don"t know exactly how to implement this function

Mar.04,2021

use (nzCheckBoxChange) = "action ($event)"

in the tree tag

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$eventcheckedKeys

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