推荐 ：https://wizard.openzeppelin.com/
basic erc20
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
␊
contract MyToken is ERC20 {␊
constructor() ERC20("MyToken", "MTK") {}␊
}␊
`erc20 with snapshots
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Snapshot.sol";␊
import "@openzeppelin/contracts/access/Ownable.sol";␊
␊
contract MyToken is ERC20, ERC20Snapshot, Ownable {␊
constructor() ERC20("MyToken", "MTK") {}␊
␊
function snapshot() public onlyOwner {␊
_snapshot();␊
}␊
␊
// The following functions are overrides required by Solidity.␊
␊
function _beforeTokenTransfer(address from, address to, uint256 amount)␊
internal␊
override(ERC20, ERC20Snapshot)␊
{␊
super._beforeTokenTransfer(from, to, amount);␊
}␊
}␊
`erc20 burnable
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";␊
␊
contract MyToken is ERC20, ERC20Burnable {␊
constructor() ERC20("MyToken", "MTK") {}␊
}␊
`erc20 burnable with snapshots
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Snapshot.sol";␊
import "@openzeppelin/contracts/access/Ownable.sol";␊
␊
contract MyToken is ERC20, ERC20Burnable, ERC20Snapshot, Ownable {␊
constructor() ERC20("MyToken", "MTK") {}␊
␊
function snapshot() public onlyOwner {␊
_snapshot();␊
}␊
␊
// The following functions are overrides required by Solidity.␊
␊
function _beforeTokenTransfer(address from, address to, uint256 amount)␊
internal␊
override(ERC20, ERC20Snapshot)␊
{␊
super._beforeTokenTransfer(from, to, amount);␊
}␊
}␊
`erc20 pausable
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/security/Pausable.sol";␊
import "@openzeppelin/contracts/access/Ownable.sol";␊
␊
contract MyToken is ERC20, Pausable, Ownable {␊
constructor() ERC20("MyToken", "MTK") {}␊
␊
function pause() public onlyOwner {␊
_pause();␊
}␊
␊
function unpause() public onlyOwner {␊
_unpause();␊
}␊
␊
function _beforeTokenTransfer(address from, address to, uint256 amount)␊
internal␊
whenNotPaused␊
override␊
{␊
super._beforeTokenTransfer(from, to, amount);␊
}␊
}␊
`erc20 pausable with roles
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/security/Pausable.sol";␊
import "@openzeppelin/contracts/access/AccessControl.sol";␊
␊
contract MyToken is ERC20, Pausable, AccessControl {␊
bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");␊
␊
constructor() ERC20("MyToken", "MTK") {␊
_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);␊
_setupRole(PAUSER_ROLE, msg.sender);␊
}␊
␊
function pause() public onlyRole(PAUSER_ROLE) {␊
_pause();␊
}␊
␊
function unpause() public onlyRole(PAUSER_ROLE) {␊
_unpause();␊
}␊
␊
function _beforeTokenTransfer(address from, address to, uint256 amount)␊
internal␊
whenNotPaused␊
override␊
{␊
super._beforeTokenTransfer(from, to, amount);␊
}␊
}␊
`erc20 burnable pausable
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";␊
import "@openzeppelin/contracts/security/Pausable.sol";␊
import "@openzeppelin/contracts/access/Ownable.sol";␊
␊
contract MyToken is ERC20, ERC20Burnable, Pausable, Ownable {␊
constructor() ERC20("MyToken", "MTK") {}␊
␊
function pause() public onlyOwner {␊
_pause();␊
}␊
␊
function unpause() public onlyOwner {␊
_unpause();␊
}␊
␊
function _beforeTokenTransfer(address from, address to, uint256 amount)␊
internal␊
whenNotPaused␊
override␊
{␊
super._beforeTokenTransfer(from, to, amount);␊
}␊
}␊
`erc20 burnable pausable with snapshots
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Snapshot.sol";␊
import "@openzeppelin/contracts/access/Ownable.sol";␊
import "@openzeppelin/contracts/security/Pausable.sol";␊
␊
contract MyToken is ERC20, ERC20Burnable, ERC20Snapshot, Ownable, Pausable {␊
constructor() ERC20("MyToken", "MTK") {}␊
␊
function snapshot() public onlyOwner {␊
_snapshot();␊
}␊
␊
function pause() public onlyOwner {␊
_pause();␊
}␊
␊
function unpause() public onlyOwner {␊
_unpause();␊
}␊
␊
function _beforeTokenTransfer(address from, address to, uint256 amount)␊
internal␊
whenNotPaused␊
override(ERC20, ERC20Snapshot)␊
{␊
super._beforeTokenTransfer(from, to, amount);␊
}␊
}␊
`erc20 preminted
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
␊
contract MyToken is ERC20 {␊
constructor() ERC20("MyToken", "MTK") {␊
_mint(msg.sender, 1000 * 10 ** decimals());␊
}␊
}␊
`erc20 premint of 0
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
␊
contract MyToken is ERC20 {␊
constructor() ERC20("MyToken", "MTK") {}␊
}␊
`erc20 mintable
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/access/Ownable.sol";␊
␊
contract MyToken is ERC20, Ownable {␊
constructor() ERC20("MyToken", "MTK") {}␊
␊
function mint(address to, uint256 amount) public onlyOwner {␊
_mint(to, amount);␊
}␊
}␊
`erc20 mintable with roles
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/access/AccessControl.sol";␊
␊
contract MyToken is ERC20, AccessControl {␊
bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");␊
␊
constructor() ERC20("MyToken", "MTK") {␊
_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);␊
_setupRole(MINTER_ROLE, msg.sender);␊
}␊
␊
function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {␊
_mint(to, amount);␊
}␊
}␊
`erc20 permit
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol";␊
␊
contract MyToken is ERC20, ERC20Permit {␊
constructor() ERC20("MyToken", "MTK") ERC20Permit("MyToken") {}␊
}␊
`erc20 votes
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Votes.sol";␊
␊
contract MyToken is ERC20, ERC20Permit, ERC20Votes {␊
constructor() ERC20("MyToken", "MTK") ERC20Permit("MyToken") {}␊
␊
// The following functions are overrides required by Solidity.␊
␊
function _afterTokenTransfer(address from, address to, uint256 amount)␊
internal␊
override(ERC20, ERC20Votes)␊
{␊
super._afterTokenTransfer(from, to, amount);␊
}␊
␊
function _mint(address to, uint256 amount)␊
internal␊
override(ERC20, ERC20Votes)␊
{␊
super._mint(to, amount);␊
}␊
␊
function _burn(address account, uint256 amount)␊
internal␊
override(ERC20, ERC20Votes)␊
{␊
super._burn(account, amount);␊
}␊
}␊
`erc20 flashmint
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";␊
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20FlashMint.sol";␊
␊
contract MyToken is ERC20, ERC20FlashMint {␊
constructor() ERC20("MyToken", "MTK") {}␊
}␊
`erc20 full upgradeable transparent
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20BurnableUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20SnapshotUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-ERC20PermitUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20VotesUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20FlashMintUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";␊
␊
contract MyToken is Initializable, ERC20Upgradeable, ERC20BurnableUpgradeable, ERC20SnapshotUpgradeable, AccessControlUpgradeable, PausableUpgradeable, ERC20PermitUpgradeable, ERC20VotesUpgradeable, ERC20FlashMintUpgradeable {␊
bytes32 public constant SNAPSHOT_ROLE = keccak256("SNAPSHOT_ROLE");␊
bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");␊
bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");␊
␊
function initialize() initializer public {␊
__ERC20_init("MyToken", "MTK");␊
__ERC20Burnable_init();␊
__ERC20Snapshot_init();␊
__AccessControl_init();␊
__Pausable_init();␊
__ERC20Permit_init("MyToken");␊
__ERC20FlashMint_init();␊
␊
_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);␊
_setupRole(SNAPSHOT_ROLE, msg.sender);␊
_setupRole(PAUSER_ROLE, msg.sender);␊
_mint(msg.sender, 2000 * 10 ** decimals());␊
_setupRole(MINTER_ROLE, msg.sender);␊
}␊
␊
function snapshot() public onlyRole(SNAPSHOT_ROLE) {␊
_snapshot();␊
}␊
␊
function pause() public onlyRole(PAUSER_ROLE) {␊
_pause();␊
}␊
␊
function unpause() public onlyRole(PAUSER_ROLE) {␊
_unpause();␊
}␊
␊
function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {␊
_mint(to, amount);␊
}␊
␊
function _beforeTokenTransfer(address from, address to, uint256 amount)␊
internal␊
whenNotPaused␊
override(ERC20Upgradeable, ERC20SnapshotUpgradeable)␊
{␊
super._beforeTokenTransfer(from, to, amount);␊
}␊
␊
// The following functions are overrides required by Solidity.␊
␊
function _afterTokenTransfer(address from, address to, uint256 amount)␊
internal␊
override(ERC20Upgradeable, ERC20VotesUpgradeable)␊
{␊
super._afterTokenTransfer(from, to, amount);␊
}␊
␊
function _mint(address to, uint256 amount)␊
internal␊
override(ERC20Upgradeable, ERC20VotesUpgradeable)␊
{␊
super._mint(to, amount);␊
}␊
␊
function _burn(address account, uint256 amount)␊
internal␊
override(ERC20Upgradeable, ERC20VotesUpgradeable)␊
{␊
super._burn(account, amount);␊
}␊
}␊
`erc20 full upgradeable uups
Snapshot 1
`// SPDX-License-Identifier: MIT␊
pragma solidity ^0.8.2;␊
␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20BurnableUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20SnapshotUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-ERC20PermitUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20VotesUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20FlashMintUpgradeable.sol";␊
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";␊
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";␊
␊
contract MyToken is Initializable, ERC20Upgradeable, ERC20BurnableUpgradeable, ERC20SnapshotUpgradeable, AccessControlUpgradeable, PausableUpgradeable, ERC20PermitUpgradeable, ERC20VotesUpgradeable, ERC20FlashMintUpgradeable, UUPSUpgradeable {␊
bytes32 public constant SNAPSHOT_ROLE = keccak256("SNAPSHOT_ROLE");␊
bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");␊
bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");␊
bytes32 public constant UPGRADER_ROLE = keccak256("UPGRADER_ROLE");␊
␊
function initialize() initializer public {␊
__ERC20_init("MyToken", "MTK");␊
__ERC20Burnable_init();␊
__ERC20Snapshot_init();␊
__AccessControl_init();␊
__Pausable_init();␊
__ERC20Permit_init("MyToken");␊
__ERC20FlashMint_init();␊
__UUPSUpgradeable_init();␊
␊
_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);␊
_setupRole(SNAPSHOT_ROLE, msg.sender);␊
_setupRole(PAUSER_ROLE, msg.sender);␊
_mint(msg.sender, 2000 * 10 ** decimals());␊
_setupRole(MINTER_ROLE, msg.sender);␊
_setupRole(UPGRADER_ROLE, msg.sender);␊
}␊
␊
function snapshot() public onlyRole(SNAPSHOT_ROLE) {␊
_snapshot();␊
}␊
␊
function pause() public onlyRole(PAUSER_ROLE) {␊
_pause();␊
}␊
␊
function unpause() public onlyRole(PAUSER_ROLE) {␊
_unpause();␊
}␊
␊
function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE) {␊
_mint(to, amount);␊
}␊
␊
function _beforeTokenTransfer(address from, address to, uint256 amount)␊
internal␊
whenNotPaused␊
override(ERC20Upgradeable, ERC20SnapshotUpgradeable)␊
{␊
super._beforeTokenTransfer(from, to, amount);␊
}␊
␊
function _authorizeUpgrade(address newImplementation)␊
internal␊
onlyRole(UPGRADER_ROLE)␊
override␊
{}␊
␊
// The following functions are overrides required by Solidity.␊
␊
function _afterTokenTransfer(address from, address to, uint256 amount)␊
internal␊
override(ERC20Upgradeable, ERC20VotesUpgradeable)␊
{␊
super._afterTokenTransfer(from, to, amount);␊
}␊
␊
function _mint(address to, uint256 amount)␊
internal␊
override(ERC20Upgradeable, ERC20VotesUpgradeable)␊
{␊
super._mint(to, amount);␊
}␊
␊
function _burn(address account, uint256 amount)␊
internal␊
override(ERC20Upgradeable, ERC20VotesUpgradeable)␊
{␊
super._burn(account, amount);␊
}␊
}␊
`
