# 枚举扩展(Enumeration extension)

枚举功能可以 **发现合约已经发行的和某个用户所拥有的 NFT**。为了保证 ConfluxScan 和其他具有 NFT 展示功能的钱包能够实时获取 NFT 数据，**强烈建议**开发者在 CRC721 和 CRC1155 标准的合约中实现枚举功能。未来 ConfluxScan 可能会取消对 mint 事件的检索，未实现枚举功能的合约所发行的 NFT 将无法被查看。

实现枚举功能后，合约在 Conflux 链上单独铸造一个 NFT 的成本是 0.3～0.8 CFX。项目方如果希望获得代付设置方面的帮助，请联系刺客: <cike@confluxnetwork.org>。

&#x20;[EIP-721](https://eips.ethereum.org/EIPS/eip-721) 中把可枚举扩展作为可选项，[EIP-1155](https://eips.ethereum.org/EIPS/eip-1155) 标准去掉了可枚举扩展。对于 1155 合约，可以采用 Conflux 合约库中的 [扩展实现](https://github.com/conflux-fans/conflux-contracts/tree/main/contracts/token/CRC1155/extensions)。

范例工程合约 NFT 1.0 和 2.0在 OpenZeppelin 合约库提供[`IERC721Enumerable`](https://docs.openzeppelin.com/contracts/4.x/api/token/erc721#IERC721Enumerable)的基础上，各自分别实现了基于 Conflux 特性的枚举函数接口。


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