3.1 Solidity前导知识 1. pragma-编译指示器 pragma solidity ^0.4.0; 2. import-引用文件指令 import filename; import * as symbolName from filename; import {symboll as alias, symbol2} from filename; import filename as symbolName; 3. 注释 //单行 /* ... */多行 3.2 智能合约的基本构成