web3.js（二）根据私钥推出地址查询以太数量

最新推荐文章于 2025-06-20 09:31:45 发布

原创最新推荐文章于 2025-06-20 09:31:45 发布 · 2.9k 阅读

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#eth #以太坊 #web3

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安装web3+bignumber.js+ethereumjs-util

npm i web3 -s
npm i bignumber.js -s
npm i ethereumjs-util -s

code：

const Web3 = require("web3");
const BigNumber = require('bignumber.js');
const Ether = new BigNumber(10e+17);
const EthUtil = require('ethereumjs-util');
let web3 = new Web3(new Web3.providers.HttpProvider('https://api.myetherapi.com/eth'));
let privateKey = '291c09fc38eb9a253ee9e2d8e90c91b4f08cd87aa3d9bf707d5fd54a3b4aa442'
let publicKey = EthUtil.privateToPublic(new Buffer(privateKey, 'hex'));
let addr ="0x"+ EthUtil.publicToAddress(publicKey).toString('hex');
console.log(addr);
web3.eth.getBalance(addr).then(v => {
    let ret = new BigNumber(v);
    return parseFloat(ret.dividedBy(Ether)).toFixed(2);
}).then(sum => {
    console.log(sum);
})