node使用Web3js库签名合约交易

这里展示了一个调用USDT合约的 transferFrom方法的一个签名实例

#安装web3js库
npm install web3 

let Web3 = require('web3')

//api节点链接，这里我填的是BSC测试网的api地址
var web3 = new Web3("https://data-seed-prebsc-1-s1.binance.org:8545/");


//代币合约ABI。我这里是USDT的ABI
let abi = [{ "inputs": [], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [{ "indexed": true, "internalType": "address", "name": "owner", "type": "address" }, { "indexed": true, "internalType": "address", "name": "spender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" }], "name": "Approval", "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": false, "internalType": "uint256", "name": "value", "type": "uint256" }], "name": "Transfer", "type": "event" }, { "constant": true, "inputs": [], "name": "_decimals", "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "_name", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "_symbol", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [{ "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "spender", "type": "address" }], "name": "allowance", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" }], "name": "approve", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [{ "internalType": "address", "name": "account", "type": "address" }], "name": "balanceOf", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "uint256", "name": "amount", "type": "uint256" }], "name": "burn", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "decimals", "outputs": [{ "internalType": "uint8", "name": "", "type": "uint8" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "subtractedValue", "type": "uint256" }], "name": "decreaseAllowance", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "getOwner", "outputs": [{ "internalType": "address", "name": "", "type": "address" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "addedValue", "type": "uint256" }], "name": "increaseAllowance", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "uint256", "name": "amount", "type": "uint256" }], "name": "mint", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "name", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "owner", "outputs": [{ "internalType": "address", "name": "", "type": "address" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [], "name": "renounceOwnership", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "symbol", "outputs": [{ "internalType": "string", "name": "", "type": "string" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "totalSupply", "outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "recipient", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" }], "name": "transfer", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "sender", "type": "address" }, { "internalType": "address", "name": "recipient", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" }], "name": "transferFrom", "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [{ "internalType": "address", "name": "newOwner", "type": "address" }], "name": "transferOwnership", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }]



let transferFrom = async () => {
  console.log(Web3.version)
  let gasprice = await web3.eth.getGasPrice()
  console.log("gasprice:", gasprice)
  //合约地址
  let contractaddress = '0x0'
  //实例化合约
  let contractInstance = new web3.eth.Contract(abi, contractaddress)

  //获取当前交易发起地址的nonce
  let txCount = await web3.eth.getTransactionCount("0x0")


  const txObject = {
    nonce: web3.utils.toHex(txCount),
    gasLimit: web3.utils.toHex(210000), // Raise the gas limit to a much higher amount
    gasPrice: web3.utils.toHex(gasprice),
    to: contractaddress,
    //链ID，这里我填的是BSC测试网的链ID
    chainId: 97,
//这里调用的方法是代币合约里的授权转账方法
    data: contractInstance.methods.transferFrom("代币转出方", "代币接收方", 数量).encodeABI()
  }
  
  let tx = await web3.eth.accounts.signTransaction(txObject, "私钥")


  web3.eth.sendSignedTransaction(tx.rawTransaction, (err, txHash) => {
    console.log('err:', err, 'txHash:', txHash)
  })

};

transferFrom();