ethers js基础操作

查看一个地址的余额

创建provider调用其getBalance方法
web2通过http获取内容 web3通过jsonrpc获取内容 存储在变量provider中

// 引入ethersconst { ethers } = require("ethers");// 设置JsonRpc连接const INFURA_ID = "";const provider = new ethers.providers.JsonRpcProvider(`https://mainnet.infura.io/v3/${INFURA_ID}`创建以太坊节点（通过infura网页）);const address = "0x73BCEb1Cd57C711feaC4224D062b0F6ff338501e";//这一步需要异步操作，因为它很慢，用async await包裹const main = async () => {const balance = await provider.getBalance(address);console.log(// 需要格式化地址formatEther`\nETH Balance of ${address} --> ${ethers.utils.formatEther(balance)} ETH\n`);};main();

读取智能合约

创建智能合约 参数分别是地址 abi provider
const contract = new ethers.Contract(address, ERC20_ABI, provider);

const { ethers } = require("ethers");const INFURA_ID = "";const provider = new ethers.providers.JsonRpcProvider(`https://mainnet.infura.io/v3/${INFURA_ID}`);//abi: 数组 里面是string类型的函数const ERC20_ABI = ["function name() view returns (string)","function symbol() view returns (string)","function totalSupply() view returns (uint256)","function balanceOf(address) view returns (uint)",];const address = "0x6B175474E89094C44Da98b954EedeAC495271d0F"; // DAI Contract// 关键步骤：创建智能合约 参数有3个：智能合约的地址、abi、providerconst contract = new ethers.Contract(address, ERC20_ABI, provider);const main = async () => {const name = await contract.name();const symbol = await contract.symbol();const totalSupply = await contract.totalSupply();console.log(`\nReading from ${address}\n`);console.log(`Name: ${name}`);console.log(`Symbol: ${symbol}`);console.log(`Total Supply: ${totalSupply}\n`);const balance = await contract.balanceOf("0x6c6Bc977E13Df9b0de53b251522280BB72383700");console.log(`Balance Returned: ${balance}`);console.log(`Balance Formatted: ${ethers.utils.formatEther(balance)}\n`);};main();

从一个钱包转到另一个钱包

将私钥和provider传入ether.wallet创建钱包
wallet.sendTransaction//转账

const { ethers } = require("ethers");const INFURA_ID = "";const provider = new ethers.providers.JsonRpcProvider(`https://kovan.infura.io/v3/${INFURA_ID}`);// 创建变量存储第一个钱包地址// 创建变量存储第二个钱包地址const account1 = ""; // Your account address 1const account2 = ""; // Your account address 2const privateKey1 = ""; // 存储第一个钱包的私匙const wallet = new ethers.Wallet(privateKey1, provider); //创建钱包const main = async () => {// 获得账号1的转账前余额const senderBalanceBefore = await provider.getBalance(account1);// 获得账号2的转账前余额const recieverBalanceBefore = await provider.getBalance(account2);console.log(`\nSender balance before: ${ethers.utils.formatEther(senderBalanceBefore)}`);console.log(`reciever balance before: ${ethers.utils.formatEther(recieverBalanceBefore)}\n`);// 交易const tx = await wallet.sendTransaction({to: account2,value: ethers.utils.parseEther("0.025"),});// 等待交易完成await tx.wait();console.log(tx); //在控制台显示交易过程const senderBalanceAfter = await provider.getBalance(account1);const recieverBalanceAfter = await provider.getBalance(account2);console.log(`\nSender balance after: ${ethers.utils.formatEther(senderBalanceAfter)}`);console.log(`reciever balance after: ${ethers.utils.formatEther(recieverBalanceAfter)}\n`);};main();