geth+remix+metamask 實現私有鏈智能合約部署

1.首先搭建好geth私鏈平臺 看前面文章搭建.注意啓動並開啓自動挖礦.否則部署合約會失敗.

2.用remix編寫合約代碼 在線編輯地址：Remix  建議用谷歌瀏覽器編譯，能和MetaMask無縫銜接

這裏有ERC20合約代碼如下：

pragma solidity ^0.5.7;

import './safemath.sol';

contract ErbCoin {
    using SafeMath for uint256;

    string constant public name = "RongYao Coin";      //  token name
    string constant public symbol = "RYB";           //  token symbol
    uint256 public decimals = 18;            //  token digit

    //mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance; //a授權給b表示b可轉賬給其他人的代幣數
    mapping (address => uint256) public frozenBalances; //凍結餘額
    mapping (address => uint256) public balances; //可操作餘額

    uint256 public totalSupply = 0;
    bool public stopped = false;

    //uint256 constant valueFounder = 1000000;
    address constant zeroaddr = address(0);
    address owner = zeroaddr;   //合約所有者
    address founder = zeroaddr; //初始代幣持有者

    modifier isOwner {
        assert(owner == msg.sender);
        _;
    }

    modifier isFounder {
        assert(founder == msg.sender);
        _;
    }

    modifier isAdmin {
        assert(owner == msg.sender || founder == msg.sender);
        _;
    }

    modifier isRunning {
        assert (!stopped);
        _;
    }

    modifier validAddress {
        assert(zeroaddr != msg.sender);
        _;
    }

    constructor(address _addressFounder,uint256 _valueFounder) public {
        owner = msg.sender;
        founder = _addressFounder;
        totalSupply = _valueFounder*10**decimals;
        balances[founder] = totalSupply;
        emit Transfer(zeroaddr, founder, totalSupply);
    }

    function balanceOf(address _owner) public view returns (uint256) {
        //賬戶餘額 = 可操作餘額 + 被凍結餘額
        return balances[_owner] + frozenBalances[_owner];
    }

    function transfer(address _to, uint256 _value) public isRunning validAddress returns (bool success) {
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    //msg.sender 將 _from 授權給他（msg.sender）的代幣轉給 _to
    function transferFrom(address _from, address _to, uint256 _value) public isRunning validAddress returns (bool success) {
        balances[_from] = balances[_from].sub(_value);
        //balances[_to] = balances[_to].add(_value);
        frozenBalances[_to] = frozenBalances[_to].add(_value); //代幣爲凍結狀態
        allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);
        emit TransferFrozen(_to, _value);
        return true;
    }

    //msg.sender 授權 _spender 可操作代幣數
    function approve(address _spender, uint256 _value) public isRunning isFounder returns (bool success) {
        require(_value == 0 || allowance[msg.sender][_spender] == 0,"illegal operation");
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    //凍結部分釋放
    function release(address _target, uint256 _value) public isRunning isAdmin returns(bool){
        frozenBalances[_target] = frozenBalances[_target].sub(_value);
        balances[_target] = balances[_target].add(_value);
        emit Release(_target, _value);
        return true;
    }

    function stop() public isAdmin {
        stopped = true;
    }

    function start() public isAdmin {
        stopped = false;
    }

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    event TransferFrozen(address _target, uint256 _value);
    event Release(address _target, uint256 _value);
}

代碼裏還import了一個庫文件，是爲了避免數值溢出導致的bug，代碼如下命名爲safemath.sol：

pragma solidity >=0.4.22 <0.6.0;
 
/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
 
library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }
 
        uint256 c = a * b;
        require(c / a == b);
 
        return c;
    }
 
    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
 
        return c;
    }
 
    /**
     * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;
 
        return c;
    }
 
    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);
 
        return c;
    }
 
    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

部署完就直接compile 編譯，編譯完成就deploy部署了，這裏ENV這裏選擇 injected web3 因爲我們用最簡單 metamask錢包註冊登錄，注意這裏網絡選擇你自己搭建的私鏈平臺 local或自定義RPC。deploy部署時候輸入要要轉入指定賬號地址和合約總量。Deployed Contracts 這是你的合約地址，複製保存好。
另合約部署成功後，可以在Remix上調用合約接口。如果你知道其它人的合約代碼和合約地址，也可以在Remix上編譯後，在At Address這裏輸入地址調用。

如果一次將contract名稱和代幣name、symbol保持一致，可以在ImToken自定義導入的時候可以顯示XXX而不會有_UNKOWN後綴。