使用和要求之间的差异
问题描述：
任何人都可以解释使用和 require 之间的区别，无论是直接使用还是：在和 ns 宏中使用：require ？
Can anyone explain the difference between use and require, both when used directly and as :use and :require in the ns macro?
答
require 加载libs（尚未加载）使用做同样的加上它指它们的命名空间与 clojure.core / refer 使用：exclude 等与 clojure.core / refer 一样。两者建议在 ns 中使用，而不是直接使用。
require loads libs (that aren't already loaded), use does the same plus it refers to their namespaces with clojure.core/refer (so you also get the possibility of using :exclude etc like with clojure.core/refer). Both are recommended for use in ns rather than directly.