In Vim's NERDTree, is there a way to open a file/dir using the space key or tab key?

Currently the o开发者_如何转开发nly way to open the file or directory currently underneath your cursor is to type o. Is there a way to also map this to space or tab?

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let NERDTreeMapActivateNode='<space>'

should work fine. For more information see :h NERDTreeMappings.