Visit-node takes a list of visitor functions, each with a signature (fn [node state]) that returns a context map, which can contain the keys: node, : state, : stop, or: jump.

visit - node获取一个访问者函数列表，其中每个函数都有一个返回上下文映射的签名(fn [node state])，上下文映射中可能包含键：node、： state、： stop或：jump。

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The Tactile Pro 4 closely matches the layout of a standard Mac keyboard - complete with an Fn key and special function keys that work just like those on an actual Apple keyboard.

ENGADGET: Matias updates the Tactile Pro to version 4, announces Mini Tactile Pro keyboard, we go hands-on (video)

Falling in line with the latest trends, the Blade keeps the same chiclet layout used on the original, though it's worth noting that the keyboard's backlight now illuminates the previously dim Fn functions on the F1-F12 keys.

ENGADGET: Razer Blade review (late 2012)