web3.js链接以太坊并查询钱包u余额

Posted 2023-03-30 netXiaobao

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了web3.js链接以太坊并查询钱包u余额相关的知识，希望对你有一定的参考价值。

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:

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/.
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?

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
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":以上是关于web3.js链接以太坊并查询钱包u余额的主要内容，如果未能解决你的问题，请参考以下文章 
 Web3.js查询以太币和代币余额以及转账
 笔记区块链ETH学习1--基础概念与钱包使用
 如何通过web3.js通过余额获得前N个以太坊账户？
 区块链-前端交互第一篇：使用python交互以太测试网（奔向JS）
 前端Vue项目调用页面web3.js:连接metaMask钱包,(查询钱包ETH余额,查询代币余额,ETH转账,代币转账,代币授权,查询授权数量,计算价格)等功能
 区块链教程之以太坊查询余额及其转账