写一份ARB链上的代币合约

pragma solidity ^0.8.0;

// 定义代币合约 contract MyToken { // 代币的名称 string public name; // 代币的符号 string public symbol; // 代币的小数位数 uint8 public decimals; // 代币的总发行量 uint256 public totalSupply;

// 存储每个账户的余额
mapping (address => uint256) public balanceOf;
// 存储每个账户被冻结的余额
mapping (address => uint256) public frozenBalanceOf;

// 定义转账事件
event Transfer(address indexed from, address indexed to, uint256 value);
// 定义冻结事件
event Freeze(address indexed from, uint256 value);
// 定义解冻事件
event Unfreeze(address indexed from, uint256 value);

// 构造函数，初始化代币
constructor(uint256 initialSupply, string memory tokenName, string memory tokenSymbol, uint8 decimalUnits) {
    name = tokenName;
    symbol = tokenSymbol;
    decimals = decimalUnits;
    totalSupply = initialSupply * 10 ** uint256(decimals);
    balanceOf[msg.sender] = totalSupply;
}

// 实现转账
function transfer(address to, uint256 value) public {
    // 检查发送者的余额是否足够转账
    require(balanceOf[msg.sender] >= value, "Not enough balance");

    // 更新余额
    balanceOf[msg.sender] -= value;
    balanceOf[to] += value;

    // 触发转账事件
    emit Transfer(msg.sender, to, value);
}

// 冻结账户余额
function freeze(uint256 value) public {
    // 检查发送者的余额是否足够冻结
    require(balanceOf[msg.sender] >= value, "Not enough balance to freeze");

    // 更新余额和冻结余额
    balanceOf[msg.sender] -= value;
    frozenBalanceOf[msg.sender] += value;

    // 触发冻结事件
    emit Freeze(msg.sender, value);
}

// 解冻账户余额
function unfreeze(uint256 value) public {
    // 检查发送者的冻结余额是否足够解冻
    require(frozenBalanceOf[msg.sender] >= value, "Not enough frozen balance to unfreeze");

    // 更新余额和冻结余额
    balanceOf[msg.sender] += value;
    frozenBalanceOf[msg.sender] -= value;

    // 触发解冻事件
    emit Unfreeze(msg.sender, value);
}