• DemoSimple.sol 这是B合约

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

contract DemoSimple {
   
    uint number = 1;
    function setNumber(uint _number) public {
   
        number = _number;
    }

    function getNumber() public view return