web3.Eth.Accounts返回功能



我在此处遵循一个教程,该教程将testrpc与Web3.js一起使用。安装包装以ethereumjs-testrpc和web3js之后,启动了TestRPC,可提供10个可用帐户及其私钥。

web3在1.0.0-beta.18,ethereumjs-testrpc为4.1.1。

运行以下代码

Web3 = require('web3');
web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
web3.eth.accounts

我将获得以下输出,而不是教程中所示的10个帐户。怎么了?

Accounts {
  currentProvider: [Getter/Setter],
  _requestManager:
   RequestManager {
     provider: HttpProvider { host: 'http://localhost:8545', timeout: 0, connected: false },
     providers:
      { WebsocketProvider: [Function: WebsocketProvider],
        HttpProvider: [Function: HttpProvider],
        IpcProvider: [Function: IpcProvider] },
     subscriptions: {} },
  givenProvider: null,
  providers:
   { WebsocketProvider: [Function: WebsocketProvider],
     HttpProvider: [Function: HttpProvider],
     IpcProvider: [Function: IpcProvider] },
  _provider: HttpProvider { host: 'http://localhost:8545', timeout: 0, connected: false },
  setProvider: [Function],
  _ethereumCall:
   { getId:
      { [Function: send]
        method: [Object],
        request: [Function: bound ],
        call: 'net_version' },
     getGasPrice:
      { [Function: send]
        method: [Object],
        request: [Function: bound ],
        call: 'eth_gasPrice' },
     getTransactionCount:
      { [Function: send]
        method: [Object],
        request: [Function: bound ],
        call: 'eth_getTransactionCount' } },
  wallet:
   Wallet {
     length: 0,
     _accounts: [Circular],
     defaultKeyName: 'web3js_wallet' } }

在教程的稍后,部署合同时需要web3.eth.accounts

deployedContract = VotingContract.new(['Rama','Nick','Jose'],
    {data: byteCode, from: web3.eth.accounts[0], gas: 4700000})

该教程是在Web3.js V1出来之前编写的。API在V1中发生了很大变化,包括eth.accounts。您可以固定到旧版本的Web3.js,例如0.19.0,也可以在新的V1文档中找到等效方法。

像新API中的许多其他调用一样,现在不同步地检索帐户。因此,您可以用回调或使用承诺调用它。打印到您的控制台的帐户列表看起来像:

web3.eth.getAccounts(console.log);
// or
web3.eth.getAccounts().then(console.log);

来自web3.eth.getAccounts V1文档

特别是重写了您最后引用的部分:

web3.eth.getAccounts()
.then(function (accounts) {
  return VotingContract.new(['Rama','Nick','Jose'],
    {data: byteCode, from: accounts[0], gas: 4700000});
})
.then(function (deployedContract) {
  // whatever you want to do with deployedContract...
})

如果web3.eth.accounts未显示预期结果然后,按照这两个简单的步骤(在松露控制台内)

  1. web3.eth.getAccounts().then(function(acc){ accounts = acc })

  2. accounts

那是...如果您想要特定的帐户,则accounts[0/1/2...9]

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