简单实操¶

如何计算Gas手续费:

> var estimateGas = eth.estimateGas({from:eth.accounts[1], to: eth.accounts[2], value: web3.toWei(1)})
undefined

> console.log(estimateGas)
21000
undefined

> var cost = estimateGas * gasPrice
undefined

> console.log(cost)
378000000000000
undefined

> web3.fromWei(cost)
"0.000378"

转账过程:

1. 解锁
> personal.unlockAccount(eth.accounts[0], "q1w2e3r4");
true
2. 转账
> eth.sendTransaction({from: eth.accounts[0], data : "0x0c"});
"0x5f5b0227108511f91db89f0aae641183856c4f2987158fb75aed6bb2fc12b3cc"

> trans = "0x5f5b0227108511f91db89f0aae641183856c4f2987158fb75aed6bb2fc12b3cc";

3. 刚开始, blockHash为0,说明挖矿还未成功,交易还未生效
> eth.getTransaction(trans);
{
  blockHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
  blockNumber: null,
  from: "0xfd13005f4d9415b1c5cacecbedeb7d8f94468750",
  gas: 90000,
  gasPrice: 1000000000,
  hash: "0x5f5b0227108511f91db89f0aae641183856c4f2987158fb75aed6bb2fc12b3cc",
  input: "0x0c",
  nonce: 10,
  r: "0x88985aed98d6a1835fcf071e40448e72b7b7038bd7f0ab1d2754d8855089f336",
  s: "0x428c137455a6b083045b4a218cf82cb7fa3902a609cdc71eb2cb67e4248ac395",
  to: null,
  transactionIndex: 0,
  v: "0x41",
  value: 0
}

4. 一段时间后, 交易生效
> eth.getTransaction(trans);
{
  blockHash: "0x1009e504e9088eb88342924aa383ac951ec0438bee58fa761dbd9f2def270e85",
  blockNumber: 3299,
  from: "0xfd13005f4d9415b1c5cacecbedeb7d8f94468750",
  gas: 90000,
  gasPrice: 1000000000,
  hash: "0x5f5b0227108511f91db89f0aae641183856c4f2987158fb75aed6bb2fc12b3cc",
  input: "0x0c",
  nonce: 10,
  r: "0x88985aed98d6a1835fcf071e40448e72b7b7038bd7f0ab1d2754d8855089f336",
  s: "0x428c137455a6b083045b4a218cf82cb7fa3902a609cdc71eb2cb67e4248ac395",
  to: null,
  transactionIndex: 0,
  v: "0x41",
  value: 0
}

转出账号中所有 ETH，Ethereum Wallet 中的 Send everything 实现方法:

> personal.unlockAccount(eth.accounts[3], "12345678")
true

> eth.sendTransaction({from: eth.accounts[3], to: eth.accounts[5], value: eth.getBalance(eth.accounts[3]) - cost, gas: estimateGas})
"0x4e27a477e128b200239bc2ecd899077c6ae064da963a919fef41bcc7462aec8d"

// 查看交易细节
> web3.eth.getTransaction("0x4e27a477e128b200239bc2ecd899077c6ae064da963a919fef41bcc7462aec8d")
{
  blockHash: "0x59a9905831e7ae3cb9e7c6f125cf48e2688ef4b39317838f6f6b6c8837d01404",
  blockNumber: 4367,
  from: "0x8efb99ec55bcfbe2cfe47918f2d9e55fa732111f",
  gas: 21000,
  gasPrice: 18000000000,
  hash: "0x4e27a477e128b200239bc2ecd899077c6ae064da963a919fef41bcc7462aec8d",
  input: "0x",
  nonce: 15,
  r: "0xa297401df3a1fb0298cbc1dd609deebe9ded319fadc55934ecef4d525198215",
  s: "0x780d8c46bc8d1bb89ae9d78055307d9d68a4f89ba699ef86d3f8ba88383139a6",
  to: "0xf0688330101d53bd0c6ede2ef04d33c2010e9a5d",
  transactionIndex: 0,
  v: "0x42",
  value: 999622000000000000
}

// 现在查看from账号，余额已经清零
> eth.getBalance(eth.accounts[3])
0





// 返回交易信息
> web3.eth.getTransaction("0xece08c46f872bc70406f67c7ce03ba9606532f3459fdaa8b8efeeb12ac8f1004")
> eth.getBlock(213)
// 返回交易收据
> web3.eth.getTransactionReceipt("0x4e27a477e128b200239bc2ecd899077c6ae064da963a919fef41bcc7462aec8d")

// 返回值说明
Object - 交易的收据对象，如果找不到返回null
blockHash: String - 32字节，这个交易所在区块的哈希。
blockNumber: Number - 交易所在区块的块号。
transactionHash: String - 32字节，交易的哈希值。
transactionIndex: Number - 交易在区块里面的序号，整数。
from: String - 20字节，交易发送者的地址。
to: String - 20字节，交易接收者的地址。如果是一个合约创建的交易，返回null。
cumulativeGasUsed: Number - 当前交易执行后累计花费的gas总值10。
gasUsed: Number - 执行当前这个交易单独花费的gas。
contractAddress: String - 20字节，创建的合约地址。如果是一个合约创建交易，返回合约地址，其它情况返回null。
logs: Array - 这个交易产生的日志对象数组。

eth.syncing 同步状态:

> eth.syncing
// 显示百分比
> console.log(parseInt(eth.syncing.currentBlock/eth.syncing.highestBlock*100,10)+'%')
// 剩余块数
eth.syncing.highestBlock - eth.syncing.currentBlock
setInterval(function(){
  console.log(eth.syncing.highestBlock - eth.syncing.currentBlock)
},5000);
// 进度监控
var lastPercentage = 0;var lastBlocksToGo = 0;var timeInterval = 10000;
setInterval(function(){
    var percentage = eth.syncing.currentBlock/eth.syncing.highestBlock*100;
    var percentagePerTime = percentage - lastPercentage;
    var blocksToGo = eth.syncing.highestBlock - eth.syncing.currentBlock;
    var bps = (lastBlocksToGo - blocksToGo) / (timeInterval / 1000)
    var etas = 100 / percentagePerTime * (timeInterval / 1000)

    var etaM = parseInt(etas/60,10);
    console.log(parseInt(percentage,10)+'% ETA: '+etaM+' minutes @ '+bps+'bps');

    lastPercentage = percentage;lastBlocksToGo = blocksToGo;
},timeInterval);