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由 Jeremy Kemper 提交于
respond_to recognizes JSON. render :json => @person.to_json automatically sets the content type and takes a :callback option to specify a client-side function to call using the rendered JSON as an argument. References #4185. git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5694 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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