ARB 链挖矿 dapp 系统开发模式定制
作者：开发v-hkkf5566
- 2023-04-23 广东
本文字数：3045 字
阅读完需：约 10 分钟
ARB 的英文全称是 Arbitrum，项目开发 I34-合约 I633-定制 53I9，Arbitrum 是 Offchain 实验室开发的一套以太坊扩展解决方案，也就是热门的以太坊 L2 扩容解决方案，二层扩容解决方案采用 Optimistic Rollup 技术目的是提高链上合约的可扩展性、快速性和私有性，并且与其开发者友好的设计与 EVM 全面兼容。
高度可扩展性：ARB 链采用了一种名为 “二层解决方案” 的技术，可以在链外实现高效的交易和支付，从而实现高度可扩展性，避免了以太坊等区块链平台的网络拥堵和交易延迟问题。
高速和低成本：ARB 链的交易速度非常快，且交易成本非常低。这使得 ARB 代币可以被广泛应用于各种场景，包括支付、转账、投资等。
支持 ERC-20 和 ERC-721 标准：ARB 代币是基于以太坊的 ERC-20 标准发行的，同时也支持 ERC-721 标准，这使得 ARB 代币可以方便地与其他以太坊代币进行交易和互操作。
// SPDX-License-Identifier: MITpragma solidity ^ 0.8 . 0 ;
import "./IERC20.sol" ;import "./IERC20Metadata.sol" ;contract ERC20 is IERC20, IERC20Metadata {// 地址余额 mapping(address => uint256) private _balances;// 授权地址余额 mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name; string private _symbol;
// 设定代币名称符号，并初始化铸造了10000000000代币在发布者帐号下。 constructor() { _name = "HarryToken" ; _symbol = "HYT" ; _mint(msg.sender, 10000000000 ); }
function name() public view virtual override returns (string memory) { return _name; }
function symbol() public view virtual override returns (string memory) { return _symbol; }
/// 小数点位数一般为 18 function decimals() public view virtual override returns (uint8) { return 18 ; }
// 返回当前流通代币的总量 function totalSupply() public view virtual override returns (uint256) { return _totalSupply; }
// 查询指定帐号地址余额 function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; }
// 转帐功能 function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = msg.sender; _transfer(owner, to, amount); return true ; }
// 获取被授权者可使用授权帐号的可使用余额 function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; }
// 授权指定帐事情可使用自己一定额度的帐户余额。 // 授权spender, 可将自己余额。使用可使用的余额的总量为amount function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = msg.sender; _approve(owner, spender, amount); return true ; }
//approve函数中的spender调用，将授权人 from 帐户中的代币转入to 帐户中 function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = msg.sender; _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true ; }
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = msg.sender; _approve(owner, spender, _allowances[owner][spender] + addedValue); return true ; }
function decreaseAllowance(address spender, uint256 substractedValue) public virtual returns (bool) { address owner = msg.sender; uint256 currentAllowance = _allowances[owner][spender]; require(currentAllowance >= substractedValue, "ERC20: decreased allowance below zero" ); unchecked { _approve(owner, spender, currentAllowance - substractedValue); } return true ; }
function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address( 0 ), "ERC20: transfer from the zero address" ); require(to != address( 0 ), "ERC20: transfer to the zero address" );
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance" ); unchecked { _balances[from] = fromBalance - amount; } _balances[to] += amount;
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount); }
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);
_afterTokenTransfer(address( 0 ), account, amount); }
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" ); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address( 0 ), amount); _afterTokenTransfer(account, address( 0 ), amount); }
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); }
function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance" ); unchecked { _approve(owner, spender, currentAllowance - amount); } } }
function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {}
function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {}
复制代码
}
划线
评论
复制
发布于: 刚刚阅读数: 5
开发v-hkkf5566
关注
还未添加个人签名 2022-05-27 加入
还未添加个人简介
评论