Create raw transaction & sign transaction

rawTx.js

// 地址：0x7754cea59bffd5b3638d617121fac3e224e507b3
// 私鑰：ec359d9f260fa5281b4f41c0001be1df1b0e81a742b19f69cd51fe8ed9d20dc7

> var privKey1 = '7f1a49ce75b524b81dbb0964db5da64d5b588abc4fd3f60535a97a3f8115ba43'
undefined
> var EthTx = require("ethereumjs-tx")
undefined
> var privKey1x = new Buffer(privKey1, 'hex')
undefined
> privKey1x
<Buffer 7f 1a 49 ce 75 b5 24 b8 1d bb 09 64 db 5d a6 4d 5b 58 8a bc 4f d3 f6 05 35 a9 7a 3f 81 15 ba 43>

> var rawTx = {
… nonce: web3.toHex(web3.eth.getTransactionCount(acct1)),
… to: acct2,
… gasPrice: web3.toHex(2000000000),
… gasLimit: web3.toHex(21000),
… value: web3.toHex(web3.toWei(25, 'ether')),
… data: ''
… }
undefined
> rawTx
{ nonce: '0x2',
  to: '0x1b8d0c462a116a2496bf607aebf1b3d9ee49f5f1',
  gasPrice: '0x77359400',
  gasLimit: '0x5208',
  value: '0x15af1d78b58c40000',
  data: '' }
> var tx = new EthTx(rawTx)
undefined
> tx.sign(privKey1x)
undefined
> tx.serialize().toString('hex')
'f86c028477359400825208941b8d0c462a116a2496bf607aebf1b3d9ee49f5f189015af1d78b58c40000801ca0fefa0a24e6ddd058243a1f05280481a8f0729bc951b5e2a8b171b1eb10cef737a03bd521d07f1332767d098ba4834712f77d4d63e809f6d928206edc5f1392ec50'
> web3.eth.sendRawTransaction(`0x${tx.serialize().toString('hex')}`)
'0x1b524be73803bdafd16dd5021b0c396601af32e8b606185c14e02a74732f9d1e'
> web3.eth.sendRawTransaction(`0x${tx.serialize().toString('hex')}`, (error, data) => {
… if (!error) { console.log(data) }
… })
undefined
> 0x74e76429588284eca9565f1dd6c4f2e63cb7152ecb63f7db851598e6bb654ed5