[区块链]web3.js链接以太坊并查询钱包u余额

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?

1. 有过交易的信息,上面都会显示交易的合约地址,我们找到后直接复制下来
   随便找一个以太坊账户查询的网址,查找该账户的交易信息,并找到合约地址
   给你们推荐一个: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
   
   
2. 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'));
});

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