▍1. solidity5
说明: 入门 属性访问权限 通过地址的转账实现 无符号整型与有符号整型 与或非运算讲解 整型数值运算的讲解 整型中Var的使用 字典哈希表一对一存储 字符串基础(Introduction Property access Transfer by address Unsigned and signed integers And or non operation explanation Explanation of integer numerical operation The use of VaR in integer Dictionary hash table one-to-one storage String basis)