阿凡达泰山众筹平台开发（模式搭建）

去中心化应用（Dapp）一般是指运行在分布式网络上，参与者的信息被安全保护（也可能是匿名的），通过网络节点不同人，进行去中心化操作的应用。从以太坊角度来说它是一个交易协议，根据区块链上设定的条件来执行的一个合约或者一组合约系统開发180-383I-97Z4。

ragma solidity ^0.8.0;

contract SimpleStorage {

    uint public storedData;

    address  public  owner=0x5B38Da6a701c568545dCfcB03FcB875f56beddC4;

    uint256 public money;

    address public thisAddress=address(this);

    address public thisAddress2=msg.sender;

    uint public etherTest=1 gwei;

    mapping(address => uint256) public balances;

    event Set(uint x);//事件

     enum State { Created, Locked, InValid } // 枚举

     State public state;

    modifier onlyOwner(){

       require(owner == msg.sender,"only owner can call this function");

       _;

    }

    struct Voter { // 结构体

        uint weight;

        bool voted;

    }

    Voter[] public voter;

    function set(uint x) public onlyOwner {

        storedData = x;    // 错误的，多加了一个加号

        emit  Set(storedData);

    }

    function setState(State _state) public{

        state=_state;

    }

    function f(uint len) public pure {

        uint[] memory a = new uint[](7);

        bytes memory b = new bytes(len);

        assert(a.length == 7);

        assert(b.length == len);

        a[6] = 8;

    }

    function setVoter( uint _weight,bool _voted) public {

        voter.push(Voter(_weight,_voted));

    }

    function bal()   public   view returns(uint){//返回余额

        return msg.sender.balance;

    }

    function testPure(uint x)   public   pure returns(uint){//纯

        return x*2;

    }

    function buy() public payable{

        assert(msg.value>0);//必须大于0，不然不执行下面的

        money =msg.value;

    }

    function mint(address account,uint256 amount) public onlyOwner{//铸币，当前账号才有权限

        balances[account] = amount;由系统开发对接威：lovei130908编辑整理发布

    }

}