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[fix] 修复Solidity-103, 34课 ERC721 文档与示例代码不相符的问题. #244

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[fix] 修复Solidity-103, 34课 ERC721 文档与示例代码不相符的问题. #244

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10 changes: 9 additions & 1 deletion docs/solidity-103/34_ERC721/readme.md
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,14 @@ interface IERC721 is IERC165 {
```solidity
// ERC721接收者接口：合约必须实现这个接口来通过安全转账接收ERC721
interface IERC721Receiver {
/**
* @dev 每个 {IERC721} `tokenId` 通过 {IERC721-safeTransferFrom} 由 `operator` 从 `from` 转移到
* 该合约时，该函数会被调用。
*
* 该函数必须返回其 Solidity selector 以确认代币的转账。
* 如果返回了其他值，或者 tokenId 接收者没有实现该接口，则转账将被回滚。
*
*/
function onERC721Received(
address operator,
address from,
Expand Down Expand Up @@ -209,7 +217,7 @@ import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./String.sol";

contract ERC721 is IERC721, IERC721Metadata{
contract ERC721 is IERC721, IERC165, IERC721Metadata{
using Strings for uint256; // 使用String库，

// Token名称
Expand Down