Solidity 智能合约的交易手续费

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22年3月23日
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团队收取手续费基本上是和打进黑洞的转账操作是差不多的

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.2;
import "./ERC20.sol";
contract Token is ERC20{
 
   string private _name;    //币名字
    string private _symbol;      //币符号
    address public deadwallet = 0x0000000000000000000000000000000000000000;    //销毁地址
    address public LiquityWallet;            //铸币钱包
    mapping(address => bool) public _isBlacklisted;    //是否是黑名单,true表示这个地址是黑名单
     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
     uint256 public launchedAt;  
    address private _marketingWalletAddress;         //营销钱包，收手续费的
    uint256  marketingFee = 4;                                                       //营销钱包收进的手续费
     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
    /*
     * @dev 返回代币的名字
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }
    /**
     * @dev 返回代币的符号
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }
    /**
     * 返回代币精度
     */
    function decimals() public pure virtual returns (uint8) {
        return 18;
    }
    constructor() public{
        _name='Token';
        _symbol='Tk';
        _mint(msg.sender, 10000000000000 * (10 ** 18));            //铸币给连接此合约的账号于10000000000000个币;
        LiquityWallet=msg.sender;
         // exclude from paying fees or having max transaction amount 排除支付费用或拥有最大交易金额
        excludeFromFees(LiquityWallet, true);        //排除流动性钱包的支付手续费和最大交易金额
        excludeFromFees(address(this), true);              //排除铸币钱包的支付手续费和最大交易金额
        excludeFromFees(_marketingWalletAddress, true);      //排除营销钱包的支付手续费和最大交易金额
    }
     //交易函数
     function _transfer(address recipient, uint256 amount) public returns (bool) {
        require(!_isBlacklisted[msg.sender], 'Blacklisted address');      //如果发送方是黑名单则禁止交易
        if(LiquityWallet!=msg.sender) return super.transfer(recipient, amount); //如果铸币方是发送方则不需要销毁
         if(block.timestamp