*/ event Approval(address indexed owner, address indexed spender, uint256 value); } ERC-20 ERC-20是对IERC-20接口的实现,具体代码如下所示: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol 代码语言:javascript 代码运行次数:0 运行 AI代码解释 pragma...
Approval(address owner, address spender, uint256 value) event Emitted when the allowance of a spender for an owner is set by a call to approve. value is the new allowance.ERC20Implementation of the IERC20 interface.This implementation is agnostic to the way tokens are created. This means th...
Returns the account balance of another account with address `_owner`. 返回地址为`_owner`的另一个帐户的帐户余额。 functionbalanceOf(address_owner)publicviewreturns(uint256balance) 转移(transfer) Transfers `_value` amount of tokens to address `_to`, and MUST fire the `Transfer` event. The func...
address spender)publicviewreturns(uint);functiontransfer(addressto, uint tokens)publicreturns(bool);functionapprove(address spender, uint tokens)publicreturns(bool);functiontransferFrom(addressfrom, addressto, uint tokens)publicreturns(bool);
So while we’re used to seeing and dealing with ERC-20 tokens, few people know exactly what they are, how they work, or even what ERC-20 means. In case you’re wondering, ERC stands for “Ethereum Request Comment”, and “20” is the arbitrary number assigned to the proposal. ...
At the core of an ERC-20 token contract are the public API functions transfer() andtransferFrom(), which implement the secure transfer of tokens from one address to another. Thetransfer()function lets an account holder transfer a certain amount of their own tokens to another address. The code...
8, means to divide the token amount by 100000000 to get its user representation. // //OPTIONAL - This method can be used to improve usability, but interfaces and other contracts MUST NOT expect these values to be present. // 精度 function decimals() view returns (uint8 decimals); //...
ERC-20 tokens are built on Ethereum, which means they have the same level of security as Ethereum does. They’re also compatible with other projects within the Ethereum ecosystem. Given Ethereum’s position as the number one blockchain for decentralized applications and decentralized finance serv...
The next wave of standards might emerge from unexpected use cases – perhaps social tokens that combine ERC-721’s uniqueness with ERC-20’s transferability or new standards that address cross-chain compatibility. For developers and users, mastering these standards means more than understanding their...
"Token" and "Cryptocurrency" are often used interchangeably; all cryptocurrencies are tokens, but not all tokens are cryptocurrencies. Tokens often represent assets and rights that are external to a blockchain. Token, in the context of ERC-20 compliance, simply means a blockchain representation of...