Hack-learning-

代码说明：

  想做黑客绝对值的一本书，通俗易懂，用形象的话来解释深刻的含义，让你更容易的理解，而且包括众多例子，绝对经典(Hackers want the absolute value of a book, easy to understand, with the image of the words to explain the profound meaning, makes it easier to understand, but also many examples, absolute classic)