遵守ERC20协议，将以太坊协议包装在WETH中，可以实现所有的以太坊方法。

继承Openzepplin协议

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {ERC20Burnable} from "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

contract WETH is ERC20, ERC20Burnable, Ownable{
    event Deposit(address indexed account, uint amount);
    event Withdraw(address indexed account, uint amount);


    constructor(address initialOwner)
        ERC20("MyToken", "MTK")
        Ownable(initialOwner)
    {}

    fallback() external payable { 
        deposit();
    }

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }

    function deposit() public payable {
        _mint(msg.sender, msg.value);
        emit Deposit(msg.sender, msg.value);
    }

    function withdraw(uint _amount) external {
        _burn(msg.sender, _amount);
        payable(msg.sender).transfer(_amount);
        emit Withdraw(msg.sender, _amount);
    }
}