三种token合约的一个demo

src/ERC721/MyERC721.sol

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+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Pausable.sol";
+import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+contract MyERC721 is
+    ERC721,
+    IERC721Receiver,
+    ERC721Enumerable,
+    ERC721Pausable,
+    ERC721Holder,
+    Ownable
+{
+    // onERC721Received
+    string private _address;
+
+    string private _baseUri;
+
+    constructor(
+        string memory name_,
+        string memory symbol_,
+        string memory baseUri_
+    ) ERC721(name_, symbol_) {
+        setBaseURI(baseUri_);
+    }
+
+    /**
+     * @dev 铸造NFT
+     */
+    function safeMint(address to, uint256 tokenId) public virtual onlyOwner {
+        _safeMint(to, tokenId);
+    }
+
+    /**
+     * @dev 燃烧NFT
+     */
+    function burn(uint256 tokenId) public virtual {
+        require(
+            _isApprovedOrOwner(_msgSender(), tokenId),
+            "ERC721: caller is not token owner or approved"
+        );
+        _burn(tokenId);
+    }
+
+    /**
+     * @dev 从合约中转出NFT
+     */
+    function tranferNFT(address to, uint256 tokenId) public virtual onlyOwner {
+        _safeTransfer(address(this), to, tokenId, "");
+    }
+
+    /**
+     * @dev 设置TOKEN的URI
+     */
+    function setBaseURI(string memory baseUri_) public virtual onlyOwner {
+        _baseUri = baseUri_;
+    }
+
+    /**
+     * @dev 暂停交易
+     */
+    function pause() public virtual onlyOwner {
+        _pause();
+    }
+
+    /**
+     * @dev 解除暂停
+     */
+    function unpause() public virtual onlyOwner {
+        _unpause();
+    }
+
+    function _baseURI() internal view virtual override returns (string memory) {
+        return _baseUri;
+    }
+
+    function supportsInterface(bytes4 interfaceId)
+        public
+        view
+        virtual
+        override(ERC721, ERC721Enumerable)
+        returns (bool)
+    {
+        return ERC721Enumerable.supportsInterface(interfaceId);
+    }
+
+    function _beforeTokenTransfer(
+        address from,
+        address to,
+        uint256 firstTokenId,
+        uint256 batchSize
+    ) internal virtual override(ERC721, ERC721Enumerable, ERC721Pausable) {
+        ERC721Pausable._beforeTokenTransfer(from, to, firstTokenId, batchSize);
+        ERC721Enumerable._beforeTokenTransfer(
+            from,
+            to,
+            firstTokenId,
+            batchSize
+        );
+    }
+}