Question

我试图让我的第一个dapp工作;我知道我已经关闭了，但是继续遇到web3的问题。

我正在 Windows 10 上工作，通过 PowerShell 运行 testrpc 节点。我用松露来设置我的文件夹＆amp;示例文件，然后编译和迁移。

我不认为我改变了由松露构建的 app.js 文件中的任何内容......这是代码：

var accounts;
var account;

function setStatus(message) {
  var status = document.getElementById("status");
  status.innerHTML = message;
};

function refreshBalance() {
  var meta = MetaCoin.deployed();

  meta.getBalance.call(account, {from: account}).then(function(value) {
    var balance_element = document.getElementById("balance");
    balance_element.innerHTML = value.valueOf();
  }).catch(function(e) {
    console.log(e);
    setStatus("Error getting balance; see log.");
  });
};

function calcPremium() {
    var premium = parseInt(document.getElementById("benefit").value)/10000;
    document.getElementById("monthlyPremium").innerHTML = "&nbsp; &nbsp; Monthly Premium: $"+premium.toFixed(2);

};

function sendCoin() {
  var meta = MetaCoin.deployed();

  var amount = parseInt(document.getElementById("monthlyPremium").value);
  var receiver = document.getElementById("receiver").value;

  setStatus("Initiating transaction... (please wait)");

  meta.sendCoin(receiver, amount, {from: account}).then(function() {
    setStatus("Transaction complete!");
    refreshBalance();
  }).catch(function(e) {
    console.log(e);
    setStatus("Error sending coin; see log.");
  });
};

window.onload = function() {
  web3.eth.getAccounts(function(err, accs) {
    if (err != null) {
      alert("There was an error fetching your accounts.");
      return;
    }

    if (accs.length == 0) {
      alert("Couldn't get any accounts! Make sure your Ethereum client is configured correctly.");
      return;
    }

    accounts = accs;
    account = accounts[0];

    refreshBalance();
  });
}

我可以在 Chrome 浏览器中打开html文件，并启用 MetaMask 插件。但是，由于web3错误问题，我似乎无法以任何方式与合同进行交互。确切的信息是这篇文章的主题。

提前感谢您的任何帮助或指导！

Answer 1

请你试试看看。我认为 onload 正在解决这个问题。

    $(window).load function() {
  web3.eth.getAccounts(function(err,accs) {
    if (err != null) {
      alert("There was an error fetching your accounts.");
      return;
    }

    if (accs.length == 0) {
      alert("Couldn't get any accounts! Make sure your Ethereum client is configured correctly.");
      return;
    }

    accounts = accs;
    account = accounts[0];

    refreshBalance();
  });
}

未捕获的ReferenceError：在window.onload

1 个答案: