ERC20, ERC721和ERC1155

简介

ERC20：以太坊上最重要、最广泛采用的可替代代币（Fungible Token）标准
ERC721：以太坊上定义非同质化代币（Non-Fungible Token, NFT）的标准接口，使得每个代币都具有唯一性、不可分割性和可验证的所有权，成为数字收藏品、游戏资产、身份凭证等场景的核心基础设施
ERC1155：以太坊上一种多代币标准（Multi-Token Standard），它突破了 ERC-20（同质化）和 ERC-721（非同质化）的单一模型限制，允许在单个智能合约中同时管理任意数量的同质化、非同质化甚至半同质化代币，显著提升效率并降低 Gas 成本

ERC20

其包含两个事件

Transfer事件
Approval事件

go 复制代码

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, uint256 value) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

ERC721

支持安全转帐，当接收地址为合约地址时，会失败
<<interface>>
ERC721
<<interface>>
IERC165

其继承IERC165

go 复制代码

interface IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    function balanceOf(address owner) external view returns (uint256 balance);
    function ownerOf(uint256 tokenId) external view returns (address owner);
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function transferFrom(address from, address to, uint256 tokenId) external;
    function approve(address to, uint256 tokenId) external;
    function setApprovalForAll(address operator, bool approved) external;
    function getApproved(uint256 tokenId) external view returns (address operator);
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

IERC165只有一个方法supportsInterface是否支持接口

go 复制代码

interface IERC165 {
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

IERC1155

<<interface>>
IERC1155
<<interface>>
IERC165

其继承IERC165

go 复制代码

interface IERC1155 is IERC165 {
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);
    event URI(string value, uint256 indexed id);

    function balanceOf(address account, uint256 id) external view returns (uint256);
    function balanceOfBatch(
        address[] calldata accounts,
        uint256[] calldata ids
    ) external view returns (uint256[] memory);
    function setApprovalForAll(address operator, bool approved) external;
    function isApprovedForAll(address account, address operator) external view returns (bool);
    function safeTransferFrom(address from, address to, uint256 id, uint256 value, bytes calldata data) external;
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external;
}