Perl/Tk FAQ - 12.6 use和require有什么区别？

    
原文：

12.6. What is the difference between use and require?

The short answer is that something like: use Tk;

is equivalent to: BEGIN { require "Tk.pm"; import Tk; }

Hence the essential difference is that a mere require Tk; does not achieve the import of function/method names. The significance of this is that it allows one to call ->Button rather than having to call the fully qualified ->Tk::Button e.g.. For further details on this subject see man perlmod(1) or see Tom Christiansen's document at: ftp://ftp.perl.com/perl/info/everything_to_know/use_vs_require



译文：

12.6 use和require有什么区别？



简单的说，下面的语句：

use Tk;

等价于：

BEGIN { require “Tk.pm”; import Tk;}



所以，它们最本质的区别就在于，仅仅require Tk;语句并没有导入相应对象的函数（方法）名。这一点的意义在于，它就使我们可以直接使用诸如->Button的方法，而不必使用完全的包名- >Tk::Button等等。关于这个主题的更详细的讨论，可以参阅perlmod的手册，或者可以参阅Tom Christiansen's的文档：

ftp://ftp.perl.com/perl/info/everything_to_know/use_vs_require