Contract Source Code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Token {

    // ERC20 标准接口
    string public constant name = "Shark"; // 代币名称
    string public constant symbol = "Shark"; // 代币符号
    uint8 public constant decimals = 18; // 精度
    uint256 private _totalSupply; // 总供应量
    mapping(address => uint256) private _balances; // 账户余额
    mapping(address => mapping(address => uint256)) private _allowances; // 授权额度

    // 所有权管理
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor(uint256 initialSupply) {
        _owner = msg.sender; // 合约部署者为初始所有者
        _totalSupply = initialSupply * (10 ** uint256(decimals)); // 总供应量
        _balances[msg.sender] = _totalSupply; // 初始总供应量分配给合约创建者
        emit OwnershipTransferred(address(0), _owner); // 初始所有权转移
    }

    modifier onlyOwner() {
        require(msg.sender == _owner, "Ownable: caller is not the owner");
        _;
    }

    // ERC20 接口实现

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    function transfer(address to, uint256 amount) public returns (bool) {
        require(to != address(0), "ERC20: transfer to the zero address");
        require(_balances[msg.sender] >= amount, "ERC20: transfer amount exceeds balance");

        _balances[msg.sender] -= amount;
        _balances[to] += amount;

        emit Transfer(msg.sender, to, amount);
        return true;
    }

    function approve(address spender, uint256 amount) public returns (bool) {
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    function transferFrom(address from, address to, uint256 amount) public returns (bool) {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(_balances[from] >= amount, "ERC20: transfer amount exceeds balance");
        require(_allowances[from][msg.sender] >= amount, "ERC20: transfer amount exceeds allowance");

        _balances[from] -= amount;
        _balances[to] += amount;
        _allowances[from][msg.sender] -= amount;

        emit Transfer(from, to, amount);
        return true;
    }

    // 可选扩展功能：销毁代币
    function burn(uint256 amount) public onlyOwner {
        require(_balances[msg.sender] >= amount, "ERC20: burn amount exceeds balance");

        _balances[msg.sender] -= amount;
        _totalSupply -= amount;

        emit Transfer(msg.sender, address(0), amount); // 事件表明代币被销毁
    }

    // 所有权管理功能
    function owner() public view returns (address) {
        return _owner;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _owner = newOwner;
        emit OwnershipTransferred(msg.sender, newOwner);
    }

    function renounceOwnership() public onlyOwner {
        _owner = address(0);
        emit OwnershipTransferred(msg.sender, address(0));
    }

    // 事件声明
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}