智能合约，我理解它就是程序机器码，可以在区块链上执行的代码，好比 C语言的*.o 文件，Java的 *.class 文件。
启动 私有链，我们的程序（合约）就跑在这条私有链上。
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geth --datadir data0 --networkid 1108 --nodiscover console
查看挖矿账户
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2web3.eth.coinbase
"0x5400ca57071e4d804e1d5f7c14f63a70fa90d541"编写solidity代码
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9pragma solidity ^0.4.0;
contract HelloWorld {
function test(uint a) constant returns(uint d){
return a * 8;
}
}编译为字节码和abi
在线编译 ，
compile - Start To compile -> Detailsbytecode只要object的值，abi 全部拷贝。注：Details -> web3Deploy有部署的示例，但我们自己手动来一遍。
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27bytecode
6060604052341561000f57600080fd5b60b98061001d6000396000f300606060405260043610603f576000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff16806329e99f07146044575b600080fd5b3415604e57600080fd5b606a600480360381019080803590602001909291905050506080565b6040518082815260200191505060405180910390f35b60006008820290509190505600a165627a7a7230582079ee88ca1fe7e781407b09bc2c5497dcabc538d6930265a54386d2b71b0cd7510029
abi
[
{
"constant": true,
"inputs": [
{
"name": "a",
"type": "uint256"
}
],
"name": "test",
"outputs": [
{
"name": "d",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}
]
abi转义
[{\"constant\":true,\"inputs\":[{\"name\":\"a\",\"type\":\"uint256\"}],\"name\":\"test\",\"outputs\":[{\"name\":\"d\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}]创建合约对象
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10赋值为本地变量。
因为是十六进制，加上 0x 赋值给 bytecode
> bytecode = '0x6060604052341561000f57600080fd5b60b98061001d6000396000f300606060405260043610603f576000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff16806329e99f07146044575b600080fd5b3415604e57600080fd5b606a600480360381019080803590602001909291905050506080565b6040518082815260200191505060405180910390f35b60006008820290509190505600a165627a7a7230582079ee88ca1fe7e781407b09bc2c5497dcabc538d6930265a54386d2b71b0cd7510029'
# abi要解析为对象。
var abi = JSON.parse('[{\"constant\":true,\"inputs\":[{\"name\":\"a\",\"type\":\"uint256\"}],\"name\":\"test\",\"outputs\":[{\"name\":\"d\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}]')
> var helloWorldContract = web3.eth.contract(abi)
undefined预估部署合约的手续费
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6eth.estimateGas({data: bytecode})
102074
查看余额，如果账户的余额不够，先挖矿。
account1 = web3.eth.coinbase
web3.eth.getBalance(account1)
600000000000000000000部署
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22解锁
personal.unlockAccount(account1, '123456')
true
部署，gas 是手续费
var helloWorldContractInstance = helloWorldContract.new({data: bytecode ,gas: 2000000, from: account1})
或者带上一个回调函数function，用于打印日志
var helloWorldContractInstance = helloWorldContract.new(
{
data: bytecode,
gas: 2000000,
from: account1
}, function (e, contract){
console.log(e, contract);
if (typeof contract.address !== 'undefined') {
console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
}
})
从log看到，合约已经创建
INFO [03-30|20:50:12] Submitted contract creation fullhash=0x583c5c0e6f8c2225cd8411b1ba0a58304505aea929d6c9cd1c0773c952657416 contract=0x05E4898E94785523c6C5AcBa4324B529B5197Bcf
null [object Object]
undefined合约等待挖矿，开始挖矿
合约需要有节点在挖矿才能部署成功，所以我们先启动挖矿。
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20miner.start()
INFO [03-30|20:51:30] Updated mining threads threads=0
INFO [03-30|20:51:30] Transaction pool price threshold updated price=18000000000
null
这里等待一会
INFO [03-30|20:51:30] Starting mining operation
INFO [03-30|20:51:30] Commit new mining work number=195 txs=1 uncles=0 elapsed=998.832µs
INFO [03-30|20:51:46] Successfully sealed new block number=195 hash=d60b89…65bffe
INFO [03-30|20:51:46] 🔗 block reached canonical chain number=190 hash=4159ba…196761
INFO [03-30|20:51:46] 🔨 mined potential block number=195 hash=d60b89…65bffe
INFO [03-30|20:51:46] Commit new mining work number=196 txs=0 uncles=0 elapsed=7.087ms
null [object Object]
Contract mined! address: 0x05e4898e94785523c6c5acba4324b529b5197bcf transactionHash: 0x583c5c0e6f8c2225cd8411b1ba0a58304505aea929d6c9cd1c0773c952657416
INFO [03-30|20:51:55] Successfully sealed new block number=196 hash=f6a947…15b0a4
INFO [03-30|20:51:55] 🔗 block reached canonical chain number=191 hash=c95b93…bdd2a6
INFO [03-30|20:51:55] 🔨 mined potential block number=196 hash=f6a947…15b0a4
INFO [03-30|20:51:55] Commit new mining work number=197 txs=0 uncles=0 elapsed=2.289ms
只要挖矿成功了，就可以停止了
miner.stop()
true检查部署结果和调用合约方法
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9helloWorldContractInstance.address
"0x05e4898e94785523c6c5acba4324b529b5197bcf"
> eth.getCode(helloWorldContractInstance.address)
"0x606060405260043610603f576000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff16806329e99f07146044575b600080fd5b3415604e57600080fd5b606a600480360381019080803590602001909291905050506080565b6040518082815260200191505060405180910390f35b60006008820290509190505600a165627a7a7230582079ee88ca1fe7e781407b09bc2c5497dcabc538d6930265a54386d2b71b0cd7510029"
>
helloWorldContractInstance.test(4)
32OK
