Kristian Barrett提出了一个问题：lodash debounce not working in anonymous function，或许与您遇到的问题类似。
回答者Michael Dahl给出了该问题的处理方式：
As Palpatim explained, the reason lies in the fact that _.debouce(...) returns a function, which when invoked does it's magic.
Therefore in your #anonFunction example, you have a key listener, which when invoked does nothing but return a function to the invoker, which does nothing with the return values from the event listener.
This is a snippet of the _.debounce(...) definition:
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Your key event listener must invoke the returned function from _.debounce(...), or you can do as in your non-anonymous example and use the returned function from the _.debounce(...) call as your event listener.
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