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 principles and concepts of the main analysis posted solutions that do not discuss specific program syntax, based on the so beginners can run from the first program. Other matters suc