在合约中实现扣除交易手续费，并在uniswap/ pancakeSwap 设置交易滑点

  1 // SPDX-License-Identifier: MIT
  2 pragma solidity ^0.8.6;
  3 import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
  4 
  5 contract Token is ERC20{
  6  
  7     string private _name;    // Token 名字
  8     string private _symbol;      // Token 符号
  9 
 10     address public deadwallet = 0x000000000000000000000000000000000000dead;    //销毁地址
 11     address public LiquityWallet;            //铸币钱包
 12 
 13     mapping(address => bool) public _isBlacklisted;    //是否是黑名单,true表示这个地址是黑名单
 14     uint256 public tradingEnabledTimestamp = 1627779600; // 10:00pm       //2021-08-1 9:00:00的时间戳，这里设置开盘时间，开盘时间逻辑后面再提，这里先注重防机器人
 15     uint256 public launchedAt;  
 16 
 17     address private _marketingWalletAddress;         //营销钱包，收手续费的
 18     uint256  marketingFee = 4;                                                       //营销钱包收进的手续费
 19      mapping(address => bool) private _isExcludedFromFees;          //判断是否此账号需要手续费，true为不需要手续费
 20 
 21     /*
 22      * @dev 返回代币的名字
 23      */
 24     function name() public view virtual returns (string memory) {
 25         return _name;
 26     }
 27     /**
 28      * @dev 返回代币的符号
 29      */
 30     function symbol() public view virtual returns (string memory) {
 31         return _symbol;
 32     }
 33     /**
 34      * 返回代币精度
 35      */
 36     function decimals() public pure virtual returns (uint8) {
 37         return 18;
 38     }
 39     constructor() public{
 40         _name='Token';
 41         _symbol='Tk';
 42         _mint(msg.sender, 10000000000000 * (10 ** 18));            //铸币给连接此合约的账号于10000000000000个币;
 43         LiquityWallet=msg.sender;
 44          // exclude from paying fees or having max transaction amount 排除支付费用或拥有最大交易金额
 45         excludeFromFees(LiquityWallet, true);        //排除流动性钱包的支付手续费和最大交易金额
 46         excludeFromFees(address(this), true);              //排除铸币钱包的支付手续费和最大交易金额
 47         excludeFromFees(_marketingWalletAddress, true);      //排除营销钱包的支付手续费和最大交易金额
 48     }
 49      //交易函数
 50      function _transfer(address recipient, uint256 amount) public returns (bool) {
 51         require(!_isBlacklisted[msg.sender], 'Blacklisted address');      //如果发送方是黑名单则禁止交易
 52         if(LiquityWallet!=msg.sender) return super.transfer(recipient, amount); //如果铸币方是发送方则不需要销毁
 53          if(block.timestamp <= tradingEnabledTimestamp + 9 seconds) {  //当前块的时间戳小于等于 可交易时间戳+9秒。
 54             addBot(msg.sender);                                   //把当前地址添加黑名单
 55          }
 56          if(!_isExcludedFromFees[msg.sender]){
 57         uint256 BurnWallet = amount.mul(5).div(100);       //销毁百分之5
 58         uint256 marketFee=amount.mul(marketingFee).div(100);     //团队手续费
 59         uint256 trueAmount = amount.sub(BurnWallet).sub(marketFee);   //剩下的就是要发送的
 60         super.transfer(deadwallet, BurnWallet);          //销毁这百分之5
 61         super.transfer(_marketingWalletAddress,marketFee);   //发送给营销账号
 62         return super.transfer(recipient, trueAmount);     //发送那95%的代币
 63          }else{
 64              return super.transfer(recipient,amount);         //如果是项目方则不需要销毁和手续费；  
 65          }
 66     }
 67     function _transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
 68         require(!_isBlacklisted[msg.sender], 'Blacklisted address');      //如果发送方是黑名单则禁止交易
 69         if(LiquityWallet!=msg.sender) return super.transfer(recipient, amount); //如果铸币方是发送方则不需要销毁
 70          if(block.timestamp <= tradingEnabledTimestamp + 9 seconds) {  //当前块的时间戳小于等于 可交易时间戳+9秒。
 71             addBot(msg.sender);                                   //把当前地址添加黑名单
 72          }
 73          if(!_isExcludedFromFees[msg.sender]){
 74         uint256 BurnWallet = amount.mul(5).div(100);       //销毁百分之5
 75         uint256 marketFee=amount.mul(marketingFee).div(100);     //团队手续费
 76         uint256 trueAmount = amount.sub(BurnWallet).sub(marketFee);   //剩下的就是要发送的
 77         super.transferFrom(sender, deadwallet, BurnWallet);   //销毁这百分之5
 78         super.transferFrom(sender, _marketingWalletAddress, marketFee);  // 发送给营销账号
 79         return super.transferFrom(sender, recipient, trueAmount);  //发送剩下的币
 80          }else{
 81                return super.transferFrom(sender, recipient, amount);         //如果是项目方则不需要销毁和手续费；  
 82          }
 83     }
 84         //设置黑名单地址
 85     function blacklistAddress(address account, bool value) public {
 86         _isBlacklisted[account] = value;   //如果是true就是黑名单
 87     }
 88     //添加黑名单的函数
 89     function addBot(address recipient) private {
 90         if (!_isBlacklisted[recipient]) _isBlacklisted[recipient] = true;
 91     }
 92       //排除手续费
 93     function excludeFromFees(address account, bool excluded) public{ 
 94         require(_isExcludedFromFees[account] != excluded, "RedCheCoin Account is already the value of 'excluded'");   //如果已经排除就跳出
 95         _isExcludedFromFees[account] = excluded;                 //设置是否排除的布尔值
 96     }
 97        //返回是否除外手续费的布尔值
 98     function isExcludedFromFees(address account) public view returns (bool) {
 99         return _isExcludedFromFees[account];
100     }
101 }