合同地址在控制台中返回为未定义

Question

var web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

var accounts_list = web3.eth.accounts;
var code = fs.readFileSync('Voting.sol').toString();
var compiledCode = solc.compile(code);
var abiDefinition = JSON.parse(compiledCode.contracts[':Voting'].interface)
var VotingContract = web3.eth.contract(abiDefinition)
var byteCode = compiledCode.contracts[':Voting'].bytecode
var deployedContract = VotingContract.new(['Itachi','Luffy','Midoriya'],{data: byteCode, from: web3.eth.accounts[0], gas: 4700000})
var deployedContractAddress = deployedContract.address;

var contractInstance = VotingContract.at(deployedContract.address);
// contractInstance.voteForCandidate('Itachi', {from: web3.eth.accounts[0]}) // function to vote for Itachi
// contractInstance.totalVotesFor.call('Itachi').toLocaleString() // function to return Itachi's votes

var deployedAddress = contractInstance.address;

console.log(contractInstance.address);

输出是：undefined

但是当我手动运行节点控制台上的每个命令时，情况并非如此。当我尝试 typeof contractInstance.address 它输出为 "String"

但我不想运行每次都手动执行每个命令因此尝试运行在脚本中使用它

Answer 1

Per the documentation，如果您同步部署合约，函数 returns 会立即使用交易哈希，但您需要轮询交易的状态，直到它被挖掘。（只有这样合约的地址才可用。）

作为替代方案，您可以异步部署合约：

VotingContract.new(['Itachi','Luffy','Midoriya'],{data: byteCode, from: web3.eth.accounts[0], gas: 4700000}, function (err, deployedContract) {
    if (deployedContract.address) {
        console.log(`Address: ${deployedContract.address}`);
        // use deployedContract here
    }
});

合同地址在控制台中返回为未定义

Contract address returning as undefined in console

node.js

ethereum

web3