无法检索 MetaMask 账户的以太坊余额答案

【问题标题】：Unable to retrieve the Ethereum balance of MetaMask account无法检索 MetaMask 账户的以太坊余额
【发布时间】：2021-12-29 13:07:46
【问题描述】：

const showAccount = document.querySelector('.showAccount');  
const showBalance = document.querySelector('.showBalance');  
const Web3 = require("web3");  
getAccount();  
getBalance();

getAccount返回钱包id

async function getAccount() {  
    const accounts = await ethereum.request({ method: 'eth_requestAccounts' });  
    const account = accounts[0];  
    showAccount.innerHTML = account;  
}

getBalance 返回 undefined 而不是 Metamask 中的 Ether 数量

async function getBalance() {  
    const accounts = await ethereum.request({ method: 'eth_requestAccounts' });  
    const account = accounts[0];  
    showBalance.innerHTML = account.balance;  
}

也许有人知道一个很好的 API 可以通过示例检索比这两个更多的值，或者有一个很好的视频来学习。

我找到了 accounts 对象的属性：here

【问题讨论】：

标签： javascript ethereum web3 web3js metamask

【解决方案1】：

我自定义了您的代码，现在它显示了帐户中的以太币数量：

const showAccount = document.querySelector('.showAccount');
const showBalance = document.querySelector('.showBalance');

getAccount();
loadBalance();


async function getAccount() {
    const accounts = await ethereum.request({ method: 'eth_requestAccounts' });
    const account = accounts[0];
    showAccount.innerHTML = account;
}

function loadBalance(){
    web3Provider = null;
    contracts = {};
    account = '0x0';
    const Web3 = require("web3");
    const ethEnabled = async () => {
        if (window.ethereum) {
            await window.ethereum.send('eth_requestAccounts');
            window.web3 = new Web3(window.ethereum);
            return true;
        }
    }
    if (typeof web3 !== 'undefined') {
        // If a web3 instance is already provided by Meta Mask.
        web3Provider = web3.currentProvider;
        web3 = new Web3(web3.currentProvider);
    } else {
        // Specify default instance if no web3 instance provided
        web3Provider = new Web3.providers.HttpProvider('http://localhost:7545');
        web3 = new Web3(App.web3Provider);
    }
    $.getJSON("Market.json", function (market) {
        console.log("initializing Market contract")

        // Instantiate a new truffle contract from the artifact
        contracts.Market = TruffleContract(market);
        // Connect provider to interact with contract
        contracts.Market.setProvider(web3Provider);
    });
    $.getJSON("Users.json", function (users) {
        console.log("initializing User contract")
        // Instantiate a new truffle contract from the artifact
        contracts.Users = TruffleContract(users);
        // Connect provider to interact with contract
        contracts.Users.setProvider(App.web3Provider);
    });

    var marketInstance;
    var userInstance;

    var loader = $("#loader");
    var content = $("#content");

    //loader.show();
    content.show();

    // Load account data
    console.log("loading account data")
    var currentAccount;
    web3.eth.getCoinbase(function (err, account) {
        if (err === null) {
            console.log("Your Account: " + account)
            account = account;
            currentAccount = account;
            web3.eth.getBalance(account, function(err, balance) {
                if (err === null) {  //Note:set id="accountBalance" in your html page
                    $("#accountBalance").text(web3.fromWei(balance, "ether") + " ETH");
                }
            });
        }
    });
}

【讨论】：