什么是智能合約 從技術(shù)角度來(lái)說(shuō)，智能合約可以看作一種計(jì)算機(jī)程序，這種程序可以自主地執(zhí)行全部或部分和合約相關(guān)的操作，并產(chǎn)生相應(yīng)的可以被驗(yàn)證的證據(jù)，來(lái)說(shuō)明執(zhí)行合約操作的有效性。 Web3.0的底層技術(shù)是分布式賬本技術(shù)和分布式數(shù)據(jù)庫(kù)技術(shù)，這就好比操作系統(tǒng)里的文檔系統(tǒng)（Filing）和I/O（輸出入系統(tǒng)），也像是區(qū)塊鏈里的Layer-1數(shù)據(jù)處理結(jié)構(gòu)。分布式存儲(chǔ)就像是操作系統(tǒng)里的文檔系統(tǒng)，分布式計(jì)算就像是操作系統(tǒng)里的CPU（中央處理器），分布式數(shù)據(jù)傳輸（分布式通信）也就好比I/O。CPU、文檔系統(tǒng)和I/O都是操作系統(tǒng)的基本要素，類比到Web3.0的底層技術(shù)亦是如此。I8O量化2857交易8624系統(tǒng)開發(fā) What is a smart contract From a technical point of view,a smart contract can be seen as a computer program that can independently perform all or part of contract-related operations,and generate corresponding verifiable evidence to illustrate the effectiveness of contract operations. pragma solidity^0.8.0; contract SimpleStorage{ uint public storedData; address public owner= 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); enum State{Created,Locked,InValid} State public state; modifier onlyOwner(){ require(owner==msg.sender,"only owner can call this function"); _; } struct Voter{//結(jié)構(gòu)體 uint weight; bool voted; } Voter[]public voter; function set(uint x)public onlyOwner{ storedData=x;// 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){//返回余額 return msg.sender.balance; } function testPure(uint x)public pure returns(uint){//純 return x*2; } function buy()public payable{ assert(msg.value>0);//必須大于0，不然不執(zhí)行下面的 money+=msg.value; } function mint(address account,uint256 amount)public onlyOwner{//鑄幣，當(dāng)前賬號(hào)才有權(quán)限 balance