> For the complete documentation index, see [llms.txt](https://neochain.gitbook.io/project/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://neochain.gitbook.io/project/ethereum/zhi-neng-he-yue-bian-xie-02.md).

# 智能合约编写02

## MyTransfer.sol

```
pragma solidity ^0.4.22;

contract MyTransfer {
  mapping (address => uint) public balances;

  constructor() public {
    balances[msg.sender] = 1000000;
  }

  function transfer(address _to, uint _amount) public {
    require(balances[msg.sender] < _amount, "you do not have enough money");
    balances[msg.sender] -= _amount;
    balances[_to] += _amount;
  }
}

```

## 编译合约

```bash
#编译方法有两种，一种是命令行编译（当前使用），一种是用Remid IDE编译（后面有介绍）
#从github上面下载solc编译工具
#用下面的命令行，生成abi和bin文件
../solc -o . --bin --abi MyTransfer.sol

ransAbi01 = JSON.parse('ABI文件的全部内容');
transBin01 = '0x'+'BIN文件的全部内容';
```

## 开启私链或测试链

测试链开启，请查看前面的章节

私链开启，请查看后面的章节

本例用了私链

## 部署并使用合约

```bash
#在BC01开启geth
./geth --datadir=~/eth001 --networkid 1 --bootnodes=enode://f2576f4b3334979404226043bb412e9a1f3c33d2ce9f9894e1478f9dfde5493a3f3db189393db841b308cbf35dfa4a6dafa63796968eae8721b285c12ff40bae@[172.16.172.81]:30301 console

#在BC01解锁账号
personal.unlockAccount('c230847d2669091b77053df0cbc7f533a0a4cf1c','patient1',3600)

#在BC01部署合约
var ransAbi01 = JSON.parse('[{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balances","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]');
var transFactory01 = eth.contract(transAbi01);   
var transBin01 = '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';   
    
var mytrans01 = transFactory01.new({from: eth.accounts[0], data: transBin01, gas: '100000000'}, function (e, contract){
    if(e) {
      console.error(e);
      return;
    }

    if(!contract.address) {
      console.log("Contract transaction send: TransactionHash: " + contract.transactionHash + " waiting to be mined...");

    } else {
      console.log("Contract mined! Address: " + contract.address);
      console.log(contract);
    }
 });

#部署合约结果，一定要记录合约地址
INFO [05-01|21:43:26] Submitted contract creation              fullhash=0xd501d03d450eb51daa910fabb330d8831eafabcb037303aa1bd44982fcfba23e contract=0x952704a96A017ca3EB292947B91830dB25C48185
Contract transaction send: TransactionHash: 0xd501d03d450eb51daa910fabb330d8831eafabcb037303aa1bd44982fcfba23e waiting to be mined...

#等待合约被挖坑

#在BC01查看合约内容
mytrans01 = transFactory01.at('0x952704a96A017ca3EB292947B91830dB25C48185')  
mytrans01.balances("0xc230847d2669091b77053df0cbc7f533a0a4cf1c")
mytrans01.balances("0xc9fec0bd5aab52ba08a826af70bdecd2963bf5c9")

#在BC01进行合约转账
mytrans01.transfer.sendTransaction("0xc9fec0bd5aab52ba08a826af70bdecd2963bf5c9",100,{from:eth.accounts[0]})

#转账结果
INFO [05-01|22:18:25] Submitted transaction                    fullhash=0x6141f0524b8ca179eeee772f1ddf10ff50cb5e9f6c796a7e5de56675a1343640 recipient=0x952704a96A017ca3EB292947B91830dB25C48185

#等待被挖坑

#在BC02查看转账结果
var ransAbi01 = JSON.parse('[{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balances","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]');
var transFactory01 = eth.contract(transAbi01);
#这个地址就是部署合约时，返回的合约地址
var mytrans01= transFactory01.at('0x952704a96A017ca3EB292947B91830dB25C48185')  
mytrans01.balances("0xc230847d2669091b77053df0cbc7f533a0a4cf1c")
mytrans01.balances("0xc9fec0bd5aab52ba08a826af70bdecd2963bf5c9")
```


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