UnhandledPromiseRejectionWarning：错误：返回错误：执行恢复

Question

这是我正在运行的代码，以获取我之前部署到币安智能链的合约余额：

let Web3 = require('web3');
const fs = require('fs');

let web3 = new Web3('https://data-seed-prebsc-1-s1.binance.org:8545');

const contractAddress = '0x43045f0Cec750eEb70478B023885d1956588438E';
const contractAbi = JSON.parse(fs.readFileSync("scripts/contract_abi.json").toString())
const contract = new web3.eth.Contract(contractAbi, contractAddress);

contract.methods.balanceOf(contractAddress).call().then(result=>console.log(result)).catch(err => console.log(err));

此代码向我抛出错误：

Error: Returned error: execution reverted
at Object.ErrorResponse (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/web3-core-helpers/lib/errors.js:28:19)
at /home/zuber/Projects/HelloBSC/HelloCoin/node_modules/web3-core-requestmanager/lib/index.js:303:36
at XMLHttpRequest.request.onreadystatechange (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/web3-providers-http/lib/index.js:98:13)
at XMLHttpRequestEventTarget.dispatchEvent (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/xhr2-cookies/dist/xml-http-request-event-target.js:34:22)
at XMLHttpRequest._setReadyState (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/xhr2-cookies/dist/xml-http-request.js:208:14)
at XMLHttpRequest._onHttpResponseEnd (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/xhr2-cookies/dist/xml-http-request.js:318:14)
at IncomingMessage.<anonymous> (/home/zuber/Projects/HelloBSC/HelloCoin/node_modules/xhr2-cookies/dist/xml-http-request.js:289:61)
at IncomingMessage.emit (events.js:387:35)
at endReadableNT (internal/streams/readable.js:1317:12)
at processTicksAndRejections (internal/process/task_queues.js:82:21) {
data: null}

合约从https://github.com/binance-chain/bsc-genesis-contract/blob/master/contracts/bep20_template/BEP20Token.template复制粘贴（仅在第332行添加onlyOwner修饰符）

用于将合约部署到 BSC 的 Truffle 配置：

const HDWalletProvider = require('@truffle/hdwallet-provider');
const fs = require('fs');
const mnemonic = fs.readFileSync(".secret").toString().trim();

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 8545,            // Standard BSC port (default: none)
      network_id: "*",       // Any network (default: none)
    },
    testnet: {
      provider: () => new HDWalletProvider(mnemonic, `https://data-seed-prebsc-1-s1.binance.org:8545`),
      network_id: 97,
      confirmations: 10,
      timeoutBlocks: 200,
      skipDryRun: true
    },
    bsc: {
      provider: () => new HDWalletProvider(mnemonic, `https://bsc-dataseed1.binance.org`),
      network_id: 56,
      confirmations: 10,
      timeoutBlocks: 200,
      skipDryRun: true
    },
  },

  // Set default mocha options here, use special reporters etc.
  mocha: {
    // timeout: 100000
  },

  // Configure your compilers
  compilers: {
    solc: {
      version: "0.5.16", // A version or constraint - Ex. "^0.5.0"
    }
  }
}

Answer 1

这是源自智能合约的一般错误，当合约抛出未处理的异常时。

即使您没有发布contract 源代码，我们也可以从decompiled 代码中获得有关其内容的一些基本信息。

它表明没有balanceOf()（您正在尝试调用），并且fallback()（在您尝试调用不存在的函数时使用）总是抛出异常。

---

从这里开始，最可能的可能性是您打算部署一个不同的合约（包含 balanceOf() 函数）但错误地部署了这个。

或者如果你想获取合约地址的 BNB 余额（不是代币余额），你可以使用 web3 getBalance() 方法。示例：

const balance = await web3.eth.getBalance(contractAddress);