如何修改NFT的元数据

    //管理员修改tokenuri
    function setTokenURI(uint256 tokenId, string calldata uri) public onlyOwner {
        require(_ownerOf(tokenId)!=address(0),"tokenId is error");
        _setTokenURI(tokenId, uri);
    }

    //用户修改tokenuri
    function UserSetTokenURI(uint256 tokenId, string calldata uri) public {
        require(_ownerOf(tokenId)==msg.sender,"user address is error");
        _setTokenURI(tokenId, uri);
    }