web3.js链接以太坊并查询钱包USDT余额

  • 环境:
  • 一、链接以太坊主网:
  • 二、创建一个ABI
    • 那么该如何获取ABI?
  • 三、查询代码
  • 四、输出结果
  • 五、整体代码

环境:

web3.js版本:6.14.15
不会安装以及使用web3.js的小伙伴看:https://blog.csdn.net/qq_45844443/article/details/124330035

一、链接以太坊主网:

  1. 获取以太坊的链接地址(也就是以太坊官网的主网链接)
    获取地址: https://chainlist.org/.
  2. 创建一个js文件并且创建”providers”,填上刚才随意取得的主网链接.
let Web3 = require('web3');var web3 = new Web3(new Web3.providers.HttpProvider("https://rpc.flashbots.net"));

二、创建一个ABI

那么该如何获取ABI” />https://www.yitaifang.com/accounts/.
直接右上角查询账户地址，找到里面随意一个USDT的交易并复制下来该合约地址

  • 通过合约地址查询该ABI
    查询合约地址的AB链接 :https://etherscan.io/
    复制的合约地址通过该页面查询



    获取了相应的ABI后,创建个变量
    • var abi=...//太长了，就不全部贴出来了

    三、查询代码

    var tokenContract = new web3.eth.Contract(abi, '0xdac17f958d2ee523a2206206994597c13d831ec7'); //第二个参数是刚才复制查询的ABI的合约地址tokenContract.methods.balanceOf('0x5041ed759dd4afc3a72b8192c143f72f4724081a').call({from: '0x5041ed759dd4afc3a72b8192c143f72f4724081a'}, function (error, result) {console.log(error);console.log(result);console.log(web3.utils.fromWei(result, 'mwei')); //转换成mwei是因为wei与USDT的数量转化比为"1:1000000"});//new web3.eth.Contract(abi, '刚才复制查询的ABI的合约地址')//balanceOf('查询的账号地址')//{form:'查询的账号地址'}

    四、输出结果

    五、整体代码

    let Web3 = require('web3');var web3 = new Web3(new Web3.providers.HttpProvider("https://rpc.flashbots.net"));var abi = [{"constant": true,"inputs": [],"name": "name","outputs": [{"name": "", "type": "string"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": false,"inputs": [{"name": "_upgradedAddress", "type": "address"}],"name": "deprecate","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": false,"inputs": [{"name": "_spender", "type": "address"}, {"name": "_value", "type": "uint256"}],"name": "approve","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": true,"inputs": [],"name": "deprecated","outputs": [{"name": "", "type": "bool"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": false,"inputs": [{"name": "_evilUser", "type": "address"}],"name": "addBlackList","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": true,"inputs": [],"name": "totalSupply","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": false,"inputs": [{"name": "_from", "type": "address"}, {"name": "_to", "type": "address"}, {"name": "_value","type": "uint256"}],"name": "transferFrom","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": true,"inputs": [],"name": "upgradedAddress","outputs": [{"name": "", "type": "address"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [{"name": "", "type": "address"}],"name": "balances","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [],"name": "decimals","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [],"name": "maximumFee","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [],"name": "_totalSupply","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": false,"inputs": [],"name": "unpause","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": true,"inputs": [{"name": "_maker", "type": "address"}],"name": "getBlackListStatus","outputs": [{"name": "", "type": "bool"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [{"name": "", "type": "address"}, {"name": "", "type": "address"}],"name": "allowed","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [],"name": "paused","outputs": [{"name": "", "type": "bool"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [{"name": "who", "type": "address"}],"name": "balanceOf","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": false,"inputs": [],"name": "pause","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": true,"inputs": [],"name": "getOwner","outputs": [{"name": "", "type": "address"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [],"name": "owner","outputs": [{"name": "", "type": "address"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [],"name": "symbol","outputs": [{"name": "", "type": "string"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": false,"inputs": [{"name": "_to", "type": "address"}, {"name": "_value", "type": "uint256"}],"name": "transfer","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": false,"inputs": [{"name": "newBasisPoints", "type": "uint256"}, {"name": "newMaxFee", "type": "uint256"}],"name": "setParams","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": false,"inputs": [{"name": "amount", "type": "uint256"}],"name": "issue","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": false,"inputs": [{"name": "amount", "type": "uint256"}],"name": "redeem","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": true,"inputs": [{"name": "_owner", "type": "address"}, {"name": "_spender", "type": "address"}],"name": "allowance","outputs": [{"name": "remaining", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [],"name": "basisPointsRate","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": true,"inputs": [{"name": "", "type": "address"}],"name": "isBlackListed","outputs": [{"name": "", "type": "bool"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": false,"inputs": [{"name": "_clearedUser", "type": "address"}],"name": "removeBlackList","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": true,"inputs": [],"name": "MAX_UINT","outputs": [{"name": "", "type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"}, {"constant": false,"inputs": [{"name": "newOwner", "type": "address"}],"name": "transferOwnership","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"constant": false,"inputs": [{"name": "_blackListedUser", "type": "address"}],"name": "destroyBlackFunds","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}, {"inputs": [{"name": "_initialSupply", "type": "uint256"}, {"name": "_name", "type": "string"}, {"name": "_symbol","type": "string"}, {"name": "_decimals", "type": "uint256"}],"payable": false,"stateMutability": "nonpayable","type": "constructor"}, {"anonymous": false,"inputs": [{"indexed": false, "name": "amount", "type": "uint256"}],"name": "Issue","type": "event"}, {"anonymous": false,"inputs": [{"indexed": false, "name": "amount", "type": "uint256"}],"name": "Redeem","type": "event"}, {"anonymous": false,"inputs": [{"indexed": false, "name": "newAddress", "type": "address"}],"name": "Deprecate","type": "event"}, {"anonymous": false,"inputs": [{"indexed": false, "name": "feeBasisPoints", "type": "uint256"}, {"indexed": false,"name": "maxFee","type": "uint256"}],"name": "Params","type": "event"}, {"anonymous": false,"inputs": [{"indexed": false, "name": "_blackListedUser", "type": "address"}, {"indexed": false,"name": "_balance","type": "uint256"}],"name": "DestroyedBlackFunds","type": "event"}, {"anonymous": false,"inputs": [{"indexed": false, "name": "_user", "type": "address"}],"name": "AddedBlackList","type": "event"}, {"anonymous": false,"inputs": [{"indexed": false, "name": "_user", "type": "address"}],"name": "RemovedBlackList","type": "event"}, {"anonymous": false,"inputs": [{"indexed": true, "name": "owner", "type": "address"}, {"indexed": true,"name": "spender","type": "address"}, {"indexed": false, "name": "value", "type": "uint256"}],"name": "Approval","type": "event"}, {"anonymous": false,"inputs": [{"indexed": true, "name": "from", "type": "address"}, {"indexed": true,"name": "to","type": "address"}, {"indexed": false, "name": "value", "type": "uint256"}],"name": "Transfer","type": "event"}, {"anonymous": false, "inputs": [], "name": "Pause", "type": "event"}, {"anonymous": false,"inputs": [],"name": "Unpause","type": "event"}]var tokenContract = new web3.eth.Contract(abi, '0xdac17f958d2ee523a2206206994597c13d831ec7');tokenContract.methods.balanceOf('0x5041ed759dd4afc3a72b8192c143f72f4724081a').call({from: '0x5041ed759dd4afc3a72b8192c143f72f4724081a'}, function (error, result) {console.log(error);console.log(result);console.log(web3.utils.fromWei(result, 'mwei'));});