# 用Hardhat开发智能合约，并发布ERC721 NFT By [zhongxuqi](https://paragraph.com/@zhongxuqi) · 2023-01-31 --- 1\. 安装Hardhat ------------- npm install --save-dev hardhat 2\. 初始化Hardhat工程 ---------------- 3\. 安装官方contract库 ----------------- npm install @openzeppelin/contracts 4\. 完成ERC721 NFT智能合约代码 ---------------------- 目录`contracts/DrawNFT.sol` // SPDX-License-Identifier: MIT pragma solidity ^0.8.4; import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; contract DrawNFT is ERC721, ERC721URIStorage, Ownable { using Counters for Counters.Counter; Counters.Counter private _tokenIdCounter; constructor() ERC721("DrawNFT", "DNFT") {} function safeMint(address to, string memory uri) public onlyOwner { uint256 tokenId = _tokenIdCounter.current(); _tokenIdCounter.increment(); _safeMint(to, tokenId); _setTokenURI(tokenId, uri); } // The following functions are overrides required by Solidity. function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) { super._burn(tokenId); } function tokenURI(uint256 tokenId) public view override(ERC721, ERC721URIStorage) returns (string memory) { return super.tokenURI(tokenId); } } 5\. 完成合约部署代码 ------------ 目录`scripts/deploy.ts` import { ethers } from "hardhat"; async function main() { // DrawNFT const DrawNFT = await ethers.getContractFactory("DrawNFT"); const drawNFT = await DrawNFT.deploy(); await drawNFT.deployed(); console.log(`drawNFT deployed to ${drawNFT.address}`); } // We recommend this pattern to be able to use async/await everywhere // and properly handle errors. main().catch((error) => { console.error(error); process.exitCode = 1; }); 6\. 启动本地私有链 ----------- 7\. 部署合约 -------- npx hardhat run --network localhost scripts/deploy.ts 得到合约地址 drawNFT deployed to 0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512 8\. 启动nodejs，并初始化环境 ------------------- # node Welcome to Node.js v16.15.1. Type ".help" for more information. > const { ethers } = require("ethers"); undefined > const provider = new ethers.providers.JsonRpcProvider(); undefined > account1 = new ethers.Wallet('0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80',provider) Wallet { _isSigner: true, _signingKey: [Function (anonymous)], _mnemonic: [Function (anonymous)], address: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', provider: JsonRpcProvider { _isProvider: true, _events: [], _emitted: { block: -2 }, disableCcipRead: false, formatter: Formatter { formats: [Object] }, anyNetwork: false, _networkPromise: Promise { [Object], [Symbol(async_id_symbol)]: 47, [Symbol(trigger_async_id_symbol)]: 5, [Symbol(destroyed)]: [Object] }, _maxInternalBlockNumber: -1024, _lastBlockNumber: -2, _maxFilterBlockRange: 10, _pollingInterval: 4000, _fastQueryDate: 0, connection: { url: 'http://localhost:8545' }, _nextId: 43, _eventLoopCache: { detectNetwork: null, eth_chainId: null }, _network: { chainId: 31337, name: 'unknown' } } } 9\. 初始化contract --------------- > abi = [{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"string","name":"uri","type":"string"}],"name":"safeMint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}] ... > contract = new ethers.Contract('0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512',abi,account1) ... 调用合约基本方法 > await contract.name() 'DrawNFT' > await contract.symbol() 'DNFT' 10\. mint出token --------------- > contractWithSigner = contract.connect(account1) ... > contractWithSigner.safeMint(await account1.getAddress(),'ipfs://Qmxxx') { type: 2, chainId: 31337, nonce: 2, maxPriorityFeePerGas: BigNumber { _hex: '0x59682f00', _isBigNumber: true }, maxFeePerGas: BigNumber { _hex: '0xb5f20e1e', _isBigNumber: true }, gasPrice: null, gasLimit: BigNumber { _hex: '0x01cd79', _isBigNumber: true }, to: '0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512', value: BigNumber { _hex: '0x00', _isBigNumber: true }, data: '0xd204c45e000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb922660000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000c697066733a2f2f516d7878780000000000000000000000000000000000000000', accessList: [], hash: '0x2884d83034461908dbd3be73470d36af5aec159098a8d6d049027cb5acc2c61d', v: 0, r: '0x825d7e0024a83a417f5ead21fc07044fb6e74253dea5b4de788a15c7344f1679', s: '0x3da7ab8323ab485741f9d1fdaae7a9c22fd8969a1e52ea50d9f6ab477de1cbbf', from: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', confirmations: 0, wait: [Function (anonymous)] } 查询是否mint成功 > await contractWithSigner.tokenURI(0) 'ipfs://Qmxxx' > await contractWithSigner.ownerOf(0) '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266' 11\. 发送NFT ---------- > account2 = new ethers.Wallet('0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d',provider) ... > contractWithSigner.transferFrom(await account1.getAddress(), await account2.getAddress(), 0) { type: 2, chainId: 31337, nonce: 3, maxPriorityFeePerGas: BigNumber { _hex: '0x59682f00', _isBigNumber: true }, maxFeePerGas: BigNumber { _hex: '0xac5e7c24', _isBigNumber: true }, gasPrice: null, gasLimit: BigNumber { _hex: '0xf791', _isBigNumber: true }, to: '0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512', value: BigNumber { _hex: '0x00', _isBigNumber: true }, data: '0x23b872dd000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb9226600000000000000000000000070997970c51812dc3a010c7d01b50e0d17dc79c80000000000000000000000000000000000000000000000000000000000000000', accessList: [], hash: '0x1179e89396f6c69b4f7cf5d14d673379bceca3ed86b0f4fefbe41da025aaaea9', v: 1, r: '0x06f35287e21c087138b8fae72c9b4e2008aded4e3fab4021358481d8424bc36f', s: '0x3cd8285a2ea1d9554eee14b6c799aca543d0c40006d0b7bb4a004f58fb6aa3fc', from: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', confirmations: 0, wait: [Function (anonymous)] } 查看NFT是否发送成功 > await contractWithSigner.tokenURI(0) 'ipfs://Qmxxx' > await contractWithSigner.ownerOf(0) '0x70997970C51812dc3A010C7d01b50e0d17dc79C8' --- *Originally published on [zhongxuqi](https://paragraph.com/@zhongxuqi/hardhat-erc721-nft)*