Solidity学习疑问总结

1字节(Byte)=8位(bit)

创建对象？

    struct People {
        string name;
        uint age;
    }
    People public person = People({name:'ljq',age:12});

创建数组？查询mapping映射？

contract SimpleStorage {

    mapping (string => uint256) public nameToFavoriteNumber;

    struct People {

        string name;

        uint age;

    }

    People[] public PeopleList;

    function addPerson(string memory name, uint256 age ) public {

        PeopleList.push(People({name:'qq',age:13}));

        nameToFavoriteNumber[name] = age;

    }

}

 calldata,memory,storage?  calldata：不可修改的临时变量 memory:可修改的临时变量 storage:可修改的永久变量

import合约?

import "./SimpleStorage.sol";

contract StorageFactory {
    SimpleStorage public simpleStorage;
    function createSimpleStorageContract() public {
        simpleStorage = new SimpleStorage();
    }
}

与其它合约交互?

继承和重写？

import "./SimpleStorage.sol";

contract ExtraStorage is SimpleStorage{
    // is:给ExtraStorage合约加一些额外的函数，同时也包含了SimpleStorage合约的所有功能
    // virtual: 允许该函数被重写
    function store(uint256 _favNumber) public virtual {
        favNumber = _favNumber + 5;
    }
}