Deprecatedv1 APIInterfaces/StructsIWETH本页总览IWETHGit SourceFunctionsdecimalsfunction decimals() external view returns (uint256);depositfunction deposit() external payable;withdrawfunction withdraw(uint256 wad) external;EventsDepositevent Deposit(address indexed dst, uint256 wad);Withdrawalevent Withdrawal(address indexed src, uint256 wad);