我正在嘗試創建一個市場智能合約來使用 ERC20 代幣買賣 NFT，但是當我嘗試實現購買功能時出現錯誤

I am trying to create a Marketplace Smart contract to buy and sell NFT with ERC20 token.

我的令牌.sol

pragma solidity ^0.8.4;


import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract YourToken is ERC20 {
   constructor() ERC20("Solu", "SOLU") {
       _mint(msg.sender, 1000 * 10 ** 18);
   }
}

我的 NFT.sol

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";


contract NFTToken is ERC721 {
   
   string public nameNFT;
   string public nameSymbol;
   string public nftTokenURI;
   uint256 public nftId;

   //Keep the record of  nfts
   mapping(uint256 => string) public tokenURIExists;
   
   
   //Keep the record for nfts value => give id returns cost 
   mapping(uint256 => uint256) public tokenIdToValue;
   

   
   // Base URI
   string  _baseURIextended;
   
   constructor () ERC721("Samresh", "SAM") {
       nameNFT = "Sam";
       nameSymbol = "SAM";
   
   }
   
   
   
   function setBaseURI(string memory baseURI_) external  {
       _baseURIextended = baseURI_;
   }
   
   
   
   function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
       require( _exists(tokenId),"ERC721Metadata: URI set of nonexistent token");
       tokenURIExists[tokenId] = _tokenURI;
   }
   
   function _baseURI() internal view virtual override returns (string memory) {
       return _baseURIextended;
   }
   
   function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
           require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

           string memory _tokenURI = tokenURIExists[tokenId];
           string memory base = _baseURI();
           
           // If there is no base URI, return the token URI.
           if (bytes(base).length == 0) {
               return _tokenURI;
           }
           // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
           if (bytes(_tokenURI).length > 0) {
               return string(abi.encodePacked(base, _tokenURI));
           }
           // // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
           // return string(abi.encodePacked(base, tokenId.toString()));
           return string(abi.encodePacked(base, tokenId));
   }
       
 
   function Mint (string memory _tokenURI, uint256 _nftPrice) public returns (uint256)  {
       require(msg.sender != address(0));
       nftTokenURI = _tokenURI;
       // used as token id 
       nftId ++;
       // check if a token exists with the above token id => incremented counter
       require(!_exists(nftId));
       tokenIdToValue[nftId] = _nftPrice;
       _mint(msg.sender,nftId);
       _setTokenURI(nftId, nftTokenURI);
       
       return nftId;
       
   }
   
   function tokenPrice (uint256 _tokenID) public view returns (uint256 nftPrice) {
       require(!_exists(nftId));
       nftPrice = tokenIdToValue[_tokenID]; 
   } 
   
   
}

我的市場.sol

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

import "./3_Ballot.sol";
import "./1_Storage.sol";


contract NFTMarketPlace {
   
   YourToken token;
   NFTToken  NFT;
  
   
  
 
   //keep the record for tokenID is listed on sale or not
   mapping(uint256 => bool) public tokenIdForSale;
   
   
   
   //keep the address of the nft buyer
   mapping(uint256 => address) public nftBuyers;
   
   
   constructor (address tokenAddress, address NFTAddress)  {
       token = YourToken(tokenAddress);
       NFT = NFTToken(NFTAddress);
      
   
   }
   
   function nftSale(uint256 _tokenId,bool forSale) external {
       require(msg.sender == NFT.ownerOf(_tokenId),"Only owners can change this status");
       tokenIdForSale[_tokenId] = forSale;
   }
   
  
   function nftBuy(uint256 _tokenId) payable public {
       require(tokenIdForSale[_tokenId],"Token must be on sale first");
       uint nftPrice = NFT.tokenPrice(_tokenId);
       require(msg.value >= nftPrice, "Insufficient balance.");
       
       token.transfer(payable(NFT.ownerOf(_tokenId)),nftPrice);
       nftBuyers[_tokenId] = msg.sender;
       
   }
   
   
   
}

一切都按預期工作，但是當我嘗試購買代幣時出現錯誤 注意：如果您發送價值並且您發送的價值應該小於您目前的餘額，則應該支付呼叫的函式。

我在 remix IDE 上部署程式碼並將 1000 Wei 作為 msg.value 發送

我是一個新手，任何幫助表示讚賞。提前致謝

您遇到的錯誤與程式碼無關。您的購買功能是一個payable功能。所以你必須在msg.value中發送一些ETH

在 remix 中，您會在視窗左側看到一個名為***value的參數。***輸入您希望轉移的乙太幣數量。該功能應該按預期工作！中提琴！

引用自：https://ethereum.stackexchange.com/questions/112885