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红酒链游元宇宙DAPP系统制度开发项目详情
在两个或多个参与方之间执行特定的任务开发项目I76案例好的2o72演示9II9智能合约是区块技术世界不可或缺的一局部这些合约是软件程序，当满足了规则的条件时。从实质上说，它就像一个自执行的常规合约，不需求中介，由于它依赖于它的编程值。
红酒链游NFT智能合约的编程示例：
typescript
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pragma solidity ^0.8.0;
function setBaseURI(string memory baseURI_) public onlyOwner {
_baseURIExtended = baseURI_;
}
function _baseURI() internal view virtual override returns (string memory) {
return _baseURIExtended;
}
}
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
contract WineGometaNFT is ERC721, Ownable {
uint256 public constant MAX_TOKENS = 10000;
uint256 public constant PRICE = 0.1 ether;
uint256 public constant MAX_PER_MINT = 10;
string private _baseURIExtended;
constructor(string memory _name, string memory _symbol, string memory baseURI) ERC721(_name, _symbol) {
setBaseURI(baseURI);
}
function mint(uint256 _count) public payable {
require(_count > 0 && _count <= MAX_PER_MINT, "Invalid number of tokens requested");
require(totalSupply() + _count <= MAX_TOKENS, "Purchase would exceed max supply");
require(msg.value == PRICE * _count, "Ether value sent is not correct");
for (uint256 i = 0; i < _count; i++) {
_safeMint(msg.sender, totalSupply() + 1);
}
}