概念

ERC-20 标准的 ABI 是一组函数和事件定义，用于在以太坊上实现可互换的代币标准。ERC-20 代币标准由以太坊社区提出，定义了一组基础接口和功能，如余额查询、转账和授权等。

目前以太坊等支持evm的链上最活跃的合约标准，大量的加密货币依赖此合约进行交易。

ERC-20 ABI 说明

• Functions：

  • totalSupply：返回代币的总供应量。
  • balanceOf：查询指定地址的余额。
  • transfer：从发送者地址向指定地址发送代币。
  • approve：批准某个地址可以花费指定数量的代币。
  • allowance：查询某个地址对另一个地址授权的代币数量。
  • transferFrom：从指定地址向另一个地址转移代币（需要先批准）。

• Events：

  • Transfer：代币转移事件，记录从一个地址向另一个地址转移的情况。
  • Approval：授权事件，记录某个地址被授权花费代币。

• Metadata Functions（非强制但通常包含）：

  • name：代币的名称。
  • symbol：代币的符号。
  • decimals：代币的小数位数，通常是 18。

ERC-20 标准 ABI

以下是 ERC-20 标准 ABI，用于与符合 ERC-20 标准的合约进行交互：

[
  {
    "constant": true,
    "inputs": [{"name": "_owner", "type": "address"}],
    "name": "balanceOf",
    "outputs": [{"name": "balance", "type": "uint256"}],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {"name": "_to", "type": "address"},
      {"name": "_value", "type": "uint256"}
    ],
    "name": "transfer",
    "outputs": [{"name": "", "type": "bool"}],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {"name": "_spender", "type": "address"},
      {"name": "_value", "type": "uint256"}
    ],
    "name": "approve",
    "outputs": [{"name": "", "type": "bool"}],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [
      {"name": "_owner", "type": "address"},
      {"name": "_spender", "type": "address"}
    ],
    "name": "allowance",
    "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": [{"name": "", "type": "bool"}],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "constructor"
  },
  {
    "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"
  },
  {
    "constant": true,
    "inputs": [],
    "name": "totalSupply",
    "outputs": [{"name": "", "type": "uint256"}],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [],
    "name": "name",
    "outputs": [{"name": "", "type": "string"}],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [],
    "name": "symbol",
    "outputs": [{"name": "", "type": "string"}],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [],
    "name": "decimals",
    "outputs": [{"name": "", "type": "uint8"}],
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  }
]

如何使用 ERC-20 ABI

使用上面的 ABI 和 web3.js 或 ethers.js 库，可以轻松与符合 ERC-20 标准的智能合约交互。

使用 ethers.js 示例：

使用 web3.js 示例：

const Web3 = require('web3');
const web3 = new Web3('https://mainnet.infura.io/v3/YOUR_INFURA_PROJECT_ID');

const erc20ABI = [/* 这里粘贴上面的 ERC-20 ABI */];
const contractAddress = '0xTokenContractAddress'; // 替换为 ERC-20 代币合约地址

const erc20Contract = new web3.eth.Contract(erc20ABI, contractAddress);

erc20Contract.methods.balanceOf('0xYourAddress').call()
  .then(balance => console.log(`Token Balance: ${balance}`));

总结

ERC-20 标准 ABI 包含了代币的核心功能，如代币转移、余额查询和授权操作。通过使用此标准的 ABI，你可以与任何 ERC-20 兼容的合约进行交互。

如何调用任意ERC20合约

详见github项目BlockChain_InteractTools