本贴主要分析概念原理和解决方案，不讨论具体程序语法，立足于让初学者能运行起第一个程序。其他事宜如解释入门语法等本文基本不涉及。-The main analysis of the concept of principles and paste solution, does not discuss the specific syntax, based on the so beginners can run a program from the first. Other matters such as grammar, etc. This article explains the basic entry is not involved.