purpose_handler.sol

purpose_handler.sol

pragma solidity >=0.8.0 <0.9.0;

// 其它合约引用

contract PurposeHandler {

    // 变量定义
    string public purpose = "Building Unstoppable Apps!!!";
    address public owner = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4;
    uint256 public price = 0.001 ether;
    // 事件定义

    // 构造函数
    constructor(){

    }
    // 其它函数
    function setPurpose(string memory newPurpose) payable public {
        // require(msg.sender == owner, "NOT THE OWNER");
        require(msg.value > price, "NOT ENOUGH!");
        purpose = newPurpose;
        price = msg.value;
    }
}