// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
contract lockFunction{
    address private owner;
    bool private openFunction = true;
    uint num=1;

     /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        owner = payable(msg.sender);
    }
    //手动开启
    function unlock() public onlyOwner{
        openFunction = true;
    }
    //手动关闭
    function lock() public onlyOwner{
        openFunction = false;
    }

    function getNumber(string memory thisThing)public view returns(string memory){
        require(openFunction,"close");
        string memory setRecord = thisThing;
        return setRecord;
    }

    modifier onlyOwner() {
        require(isOwner());
        _;
    }

    function isOwner() internal view returns (bool) {
        return msg.sender == owner;
    }
}

之前提问过这个问题，特地为各位做个总结，require(openFunction,"close");是需要加在每个方法的第一列，记住lock需要用onlyowner，否则每个人都可以开关，这很危险