在线合约IDE ：Remix - Ethereum IDE

1. 代码编译后可以复制ABI和bytecode

   

2. 在目录contracts/artifacts 出现*.json文件， ABI内容在JSON文件中可以找到“abi:”

   

3. Bytecode和ABI可以认为是智能合约源代码的两种外在表现形式，其中Bytecode是给机器执行的，而ABI是给DApp 开发者用的用自然语言描述的合约接口规范。 简单地将，智能合约可以理解为把“合同”变为代码，然后编译成Bytecode和ABI，Bytecode用来部署，ABI用来调用。

4. 比如Token合约,适合于以太主网或测试网

   https://goerli.etherscan.io/address/0x405ef60935c9ff11c034a56dfc85452bf3cf0656#code
   

   Bytecode:

   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  

   ABI:

   [{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[],"name":"NotPausable","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[],"name":"Pause","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpause","type":"event"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"addTrusted","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"canPause","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"notPausable","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"operator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"removeTrusted","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOperator","type":"address"}],"name":"transferOperator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"trusted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"}]
   
   

   Solidity Code:

   // SPDX-License-Identifier: MIT
   
   pragma solidity ^0.8.0;
   
   /*
    * @dev Provides information about the current execution context, including the
    * sender of the transaction and its data. While these are generally available
    * via msg.sender and msg.data, they should not be accessed in such a direct
    * manner, since when dealing with meta-transactions the account sending and
    * paying for execution may not be the actual sender (as far as an application
    * is concerned).
    *
    * This contract is only required for intermediate, library-like contracts.
    */
   abstract contract Context {
       function _msgSender() internal view virtual returns (address) {
           return msg.sender;
       }
   
       function _msgData() internal view virtual returns (bytes calldata) {
           this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
           return msg.data;
       }
   }
   
   
   /**
    * @dev Interface of the ERC20 standard as defined in the EIP.
    */
   interface IERC20 {
       /**
        * @dev Returns the amount of tokens in existence.
        */
       function totalSupply() external view returns (uint256);
   
       /**
        * @dev Returns the amount of tokens owned by `account`.
        */
       function balanceOf(address account) external view returns (uint256);
   
       /**
        * @dev Moves `amount` tokens from the caller's account to `recipient`.
        *
        * Returns a boolean value indicating whether the operation succeeded.
        *
        * Emits a {Transfer} event.
        */
       function transfer(address recipient, uint256 amount) external returns (bool);
   
       /**
        * @dev Returns the remaining number of tokens that `spender` will be
        * allowed to spend on behalf of `owner` through {transferFrom}. This is
        * zero by default.
        *
        * This value changes when {approve} or {transferFrom} are called.
        */
       function allowance(address owner, address spender) external view returns (uint256);
   
       /**
        * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
        *
        * Returns a boolean value indicating whether the operation succeeded.
        *
        * IMPORTANT: Beware that changing an allowance with this method brings the risk
        * that someone may use both the old and the new allowance by unfortunate
        * transaction ordering. One possible solution to mitigate this race
        * condition is to first reduce the spender's allowance to 0 and set the
        * desired value afterwards:
        * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        *
        * Emits an {Approval} event.
        */
       function approve(address spender, uint256 amount) external returns (bool);
   
       /**
        * @dev Moves `amount` tokens from `sender` to `recipient` using the
        * allowance mechanism. `amount` is then deducted from the caller's
        * allowance.
        *
        * Returns a boolean value indicating whether the operation succeeded.
        *
        * Emits a {Transfer} event.
        */
       function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
   
       /**
        * @dev Emitted when `value` tokens are moved from one account (`from`) to
        * another (`to`).
        *
        * Note that `value` may be zero.
        */
       event Transfer(address indexed from, address indexed to, uint256 value);
   
       /**
        * @dev Emitted when the allowance of a `spender` for an `owner` is set by
        * a call to {approve}. `value` is the new allowance.
        */
       event Approval(address indexed owner, address indexed spender, uint256 value);
   }
   
   
   /**
    * @dev Contract module which provides a basic access control mechanism, where
    * there is an account (an owner) that can be granted exclusive access to
    * specific functions.
    *
    * By default, the owner account will be the one that deploys the contract. This
    * can later be changed with {transferOwnership}.
    *
    * This module is used through inheritance. It will make available the modifier
    * `onlyOwner`, which can be applied to your functions to restrict their use to
    * the owner.
    */
   abstract contract Ownable is Context {
       address private _owner;
   
       event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
   
       /**
        * @dev Initializes the contract setting the deployer as the initial owner.
        */
       constructor () {
           address msgSender = _msgSender();
           _owner = msgSender;
           emit OwnershipTransferred(address(0), msgSender);
       }
   
       /**
        * @dev Returns the address of the current owner.
        */
       function owner() public view virtual returns (address) {
           return _owner;
       }
   
       /**
        * @dev Throws if called by any account other than the owner.
        */
       modifier onlyOwner() {
           require(owner() == _msgSender(), "Ownable: caller is not the owner");
           _;
       }
   
       /**
        * @dev Leaves the contract without owner. It will not be possible to call
        * `onlyOwner` functions anymore. Can only be called by the current owner.
        *
        * NOTE: Renouncing ownership will leave the contract without an owner,
        * thereby removing any functionality that is only available to the owner.
        */
       function renounceOwnership() public virtual onlyOwner {
           emit OwnershipTransferred(_owner, address(0));
           _owner = address(0);
       }
   
       /**
        * @dev Transfers ownership of the contract to a new account (`newOwner`).
        * Can only be called by the current owner.
        */
       function transferOwnership(address newOwner) public virtual onlyOwner {
           require(newOwner != address(0), "Ownable: new owner is the zero address");
           emit OwnershipTransferred(_owner, newOwner);
           _owner = newOwner;
       }
   }
   
   /**
    * @title Pausable
    * @dev Base contract which allows children to implement an emergency stop mechanism.
    */
   contract Pausable is Ownable {
     event Pause();
     event Unpause();
     event NotPausable();
   
     bool public paused = false;
     bool public canPause = true;
   
     /**
      * @dev Modifier to make a function callable only when the contract is not paused.
      */
     modifier whenNotPaused() {
       require(!paused || msg.sender == owner());
       _;
     }
   
     /**
      * @dev Modifier to make a function callable only when the contract is paused.
      */
     modifier whenPaused() {
       require(paused);
       _;
     }
   
     /**
        * @dev called by the owner to pause, triggers stopped state
     **/
     function pause() onlyOwner whenNotPaused public {
       require(canPause == true);
       paused = true;
       emit Pause();
     }
   
     /**
      * @dev called by the owner to unpause, returns to normal state
      */
     function unpause() onlyOwner whenPaused public {
       require(paused == true);
       paused = false;
       emit Unpause();
     }
     
     /**
      * @dev Prevent the token from ever being paused again
      **/
     function notPausable() onlyOwner public {
       paused = false;
       canPause = false;
       emit NotPausable();
     }
   }
   
   /**
    * @dev Implementation of the {IERC20} interface.
    *
    * This implementation is agnostic to the way tokens are created. This means
    * that a supply mechanism has to be added in a derived contract using {_mint}.
    * For a generic mechanism see {ERC20PresetMinterPauser}.
    *
    * TIP: For a detailed writeup see our guide
    * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
    * to implement supply mechanisms].
    *
    * We have followed general OpenZeppelin guidelines: functions revert instead
    * of returning `false` on failure. This behavior is nonetheless conventional
    * and does not conflict with the expectations of ERC20 applications.
    *
    * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
    * This allows applications to reconstruct the allowance for all accounts just
    * by listening to said events. Other implementations of the EIP may not emit
    * these events, as it isn't required by the specification.
    *
    * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
    * functions have been added to mitigate the well-known issues around setting
    * allowances. See {IERC20-approve}.
    */
   contract ERC20 is Context, IERC20 {
       mapping (address => uint256) private _balances;
   
       mapping (address => mapping (address => uint256)) private _allowances;
   
       uint256 private _totalSupply;
   
       string private _name;
       string private _symbol;
   
       /**
        * @dev Sets the values for {name} and {symbol}.
        *
        * The defaut value of {decimals} is 18. To select a different value for
        * {decimals} you should overload it.
        *
        * All three of these values are immutable: they can only be set once during
        * construction.
        */
       constructor (string memory name_, string memory symbol_) {
           _name = name_;
           _symbol = symbol_;
       }
   
       /**
        * @dev Returns the name of the token.
        */
       function name() public view virtual returns (string memory) {
           return _name;
       }
   
       /**
        * @dev Returns the symbol of the token, usually a shorter version of the
        * name.
        */
       function symbol() public view virtual returns (string memory) {
           return _symbol;
       }
   
       /**
        * @dev Returns the number of decimals used to get its user representation.
        * For example, if `decimals` equals `2`, a balance of `505` tokens should
        * be displayed to a user as `5,05` (`505 / 10 ** 2`).
        *
        * Tokens usually opt for a value of 18, imitating the relationship between
        * Ether and Wei. This is the value {ERC20} uses, unless this function is
        * overloaded;
        *
        * NOTE: This information is only used for _display_ purposes: it in
        * no way affects any of the arithmetic of the contract, including
        * {IERC20-balanceOf} and {IERC20-transfer}.
        */
       function decimals() public view virtual returns (uint8) {
           return 18;
       }
   
       /**
        * @dev See {IERC20-totalSupply}.
        */
       function totalSupply() public view virtual override returns (uint256) {
           return _totalSupply;
       }
   
       /**
        * @dev See {IERC20-balanceOf}.
        */
       function balanceOf(address account) public view virtual override returns (uint256) {
           return _balances[account];
       }
   
       /**
        * @dev See {IERC20-transfer}.
        *
        * Requirements:
        *
        * - `recipient` cannot be the zero address.
        * - the caller must have a balance of at least `amount`.
        */
       function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
           _transfer(_msgSender(), recipient, amount);
           return true;
       }
   
       /**
        * @dev See {IERC20-allowance}.
        */
       function allowance(address owner, address spender) public view virtual override returns (uint256) {
           return _allowances[owner][spender];
       }
   
       /**
        * @dev See {IERC20-approve}.
        *
        * Requirements:
        *
        * - `spender` cannot be the zero address.
        */
       function approve(address spender, uint256 amount) public virtual override returns (bool) {
           _approve(_msgSender(), spender, amount);
           return true;
       }
   
       /**
        * @dev See {IERC20-transferFrom}.
        *
        * Emits an {Approval} event indicating the updated allowance. This is not
        * required by the EIP. See the note at the beginning of {ERC20}.
        *
        * Requirements:
        *
        * - `sender` and `recipient` cannot be the zero address.
        * - `sender` must have a balance of at least `amount`.
        * - the caller must have allowance for ``sender``'s tokens of at least
        * `amount`.
        */
       function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
           _transfer(sender, recipient, amount);
   
           uint256 currentAllowance = _allowances[sender][_msgSender()];
           require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
           _approve(sender, _msgSender(), currentAllowance - amount);
   
           return true;
       }
   
       /**
        * @dev Atomically increases the allowance granted to `spender` by the caller.
        *
        * This is an alternative to {approve} that can be used as a mitigation for
        * problems described in {IERC20-approve}.
        *
        * Emits an {Approval} event indicating the updated allowance.
        *
        * Requirements:
        *
        * - `spender` cannot be the zero address.
        */
       function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
           _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
           return true;
       }
   
       /**
        * @dev Atomically decreases the allowance granted to `spender` by the caller.
        *
        * This is an alternative to {approve} that can be used as a mitigation for
        * problems described in {IERC20-approve}.
        *
        * Emits an {Approval} event indicating the updated allowance.
        *
        * Requirements:
        *
        * - `spender` cannot be the zero address.
        * - `spender` must have allowance for the caller of at least
        * `subtractedValue`.
        */
       function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
           uint256 currentAllowance = _allowances[_msgSender()][spender];
           require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
           _approve(_msgSender(), spender, currentAllowance - subtractedValue);
   
           return true;
       }
   
       /**
        * @dev Moves tokens `amount` from `sender` to `recipient`.
        *
        * This is internal function is equivalent to {transfer}, and can be used to
        * e.g. implement automatic token fees, slashing mechanisms, etc.
        *
        * Emits a {Transfer} event.
        *
        * Requirements:
        *
        * - `sender` cannot be the zero address.
        * - `recipient` cannot be the zero address.
        * - `sender` must have a balance of at least `amount`.
        */
       function _transfer(address sender, address recipient, uint256 amount) internal virtual {
           require(sender != address(0), "ERC20: transfer from the zero address");
           require(recipient != address(0), "ERC20: transfer to the zero address");
   
           _beforeTokenTransfer(sender, recipient, amount);
   
           uint256 senderBalance = _balances[sender];
           require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
           _balances[sender] = senderBalance - amount;
           _balances[recipient] += amount;
   
           emit Transfer(sender, recipient, amount);
       }
   
       /** @dev Creates `amount` tokens and assigns them to `account`, increasing
        * the total supply.
        *
        * Emits a {Transfer} event with `from` set to the zero address.
        *
        * Requirements:
        *
        * - `to` cannot be the zero address.
        */
       function _mint(address account, uint256 amount) internal virtual {
           require(account != address(0), "ERC20: mint to the zero address");
   
           _beforeTokenTransfer(address(0), account, amount);
   
           _totalSupply += amount;
           _balances[account] += amount;
           emit Transfer(address(0), account, amount);
       }
   
       /**
        * @dev Destroys `amount` tokens from `account`, reducing the
        * total supply.
        *
        * Emits a {Transfer} event with `to` set to the zero address.
        *
        * Requirements:
        *
        * - `account` cannot be the zero address.
        * - `account` must have at least `amount` tokens.
        */
       function _burn(address account, uint256 amount) internal virtual {
           require(account != address(0), "ERC20: burn from the zero address");
   
           _beforeTokenTransfer(account, address(0), amount);
   
           uint256 accountBalance = _balances[account];
           require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
           _balances[account] = accountBalance - amount;
           _totalSupply -= amount;
   
           emit Transfer(account, address(0), amount);
       }
   
       /**
        * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
        *
        * This internal function is equivalent to `approve`, and can be used to
        * e.g. set automatic allowances for certain subsystems, etc.
        *
        * Emits an {Approval} event.
        *
        * Requirements:
        *
        * - `owner` cannot be the zero address.
        * - `spender` cannot be the zero address.
        */
       function _approve(address owner, address spender, uint256 amount) internal virtual {
           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);
       }
   
       /**
        * @dev Hook that is called before any transfer of tokens. This includes
        * minting and burning.
        *
        * Calling conditions:
        *
        * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
        * will be to transferred to `to`.
        * - when `from` is zero, `amount` tokens will be minted for `to`.
        * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
        * - `from` and `to` are never both zero.
        *
        * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
        */
       function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
   }
   
   
   contract OperableToken is ERC20, Ownable, Pausable {
     address public operator;
     mapping(address=>bool) public trusted;
   
     modifier onlyTrusted {
         require(trusted[msg.sender] || msg.sender == owner(), "not trusted");
         _;
     }
     modifier onlyOperator {
         require(msg.sender == operator, "operator only");
         _;
     }
   
     constructor(string memory name, string memory symbol) ERC20(name, symbol) {
       operator = msg.sender;
     }
   
     function transferOperator(address newOperator) public onlyOperator {
       require(newOperator != address(0), "zero operator");
       operator = newOperator;
     }
   
     function addTrusted(address user) public onlyOperator {
         trusted[user] = true;
     }
   
     function removeTrusted(address user) public onlyOperator {
         trusted[user] = false;
     }
   
     function mint(address account, uint amount) public onlyTrusted {
       _mint(account, amount);
     }
   
     function burn(address account, uint amount) public onlyTrusted {
       _burn(account, amount);
     }
   
     /**
      * @dev Transfer tokens when not paused
      */
     function transfer(address _to, uint256 _value) public whenNotPaused override returns (bool) {
       return super.transfer(_to, _value);
     }
       
     /**
      * @dev transferFrom function to tansfer tokens when token is not paused
      **/
     function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused override returns (bool) {
       return super.transferFrom(_from, _to, _value);
     }
   }
   
   contract IToken is OperableToken {
     constructor() OperableToken("IToken Token", "ITK") {}
   }
   

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