说明：  20多年前，正是《重构：改善既有代码的设计》第1版的出版，使重构终于从编程高手们的小圈子走出，成为众多普通程序员日常开发工作中不可或缺的一部分。如今，Martin Fowler的《重构：改善既有代码的设计》一书已经成为全球有经验的程序员手中的利器，既可用来改善既有代码的设计、提升软件的可维护性，又可用于使既有代码更易理解、焕发出新的活力。这本备受关注的第2版在第1版的基础上做了全面修订，反映了编程领域业已发生的许多变化。第2版中介绍的重构列表更加内聚，并用JavaScript 语言重写了代码范例。此外，第2版中还新增了与函数式编程相关的重构范例，旨在教会读者如何在没有类的环境下开展重构。
(More than 20 years ago, it was the publication of The Refactoring: Improving the Design of Existing Code that finally emerged from the small circle of programming gurus and became an integral part of the daily development work of many ordinary programmers. Today, Martin Fowler's book Refactoring: Improving the Design of Existing Code has become a weapon for experienced programmers around the world to improve the design of existing code, improve the maintainability of software, and make existing code easier to understand and revitalise. This much-watched 2nd edition is overhauled on the basis of the 1st edition, reflecting many of the changes that have taken place in the field of programming. The refactoring list described in Release 2 is more cohesive and rewrites the code paradigm in the JavaScript language. In addition, new examples of refactoring related to functional programming have been added in release 2 to teach readers how to refactor in a class-free environment.)