1.打开Remix,创建一个空白模板，命名abc.sol https://remix.ethereum.org/2. 将以下代码粘贴至abc.sol，编译器选择0.8.7，右键点击 compliepragma solidity ^0.8.0; // import "hardhat/console.sol"; contract Comments { // Exposed data structure struct Comment { uint32 id; string topic; address creator_address; string message; uint256 created_at; } // Notify users that a comment was added event CommentAdded(Comment comment); uint32 private idCounter; mapping(string => Comment[]) private commentsByTopic; // Fetch a list of comments for a...