web3.eth.accounts返回一个函数

Question

我正在遵循这里使用testrpc和web3.js的教程.安装软件包后ethereumjs-testrpc和web3,testrpc开始这给10个可用的帐户和私钥.

web3是1.0.0-beta.18和ethereumjs-testrpc4.1.1.

运行以下代码时

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

我得到以下输出而不是10个帐户,如教程中所示.什么地方出了错？

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web3.eth.accounts部署合同时,需要在本教程的后面部分

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

Answer 1

该教程是在web3.js v1发布之前编写的.API在v1中发生了重大变化,包括eth.accounts.您可以固定到旧版本的web3.js 0.19.0,或者在新的v1文档中找到等效方法.

现在异步完成检索帐户,就像新API中的许多其他调用一样.所以你可以通过回调或使用promises来调用它.将帐户列表打印到控制台将如下所示:

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

从web3.eth.getAccountsv1文档

所以特别重写你最后引用的部分:

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...
})