web3中的備份功能

我在這裡找到瞭如何製作可升級契約的答案

如何在 web3 上使用備份函式從 currentVersion 呼叫函式？

   contract Relay {
   address public currentVersion;
   address public owner;

   function Relay(address initAddr){
       currentVersion = initAddr;
       owner = msg.sender;
   }

   function update(address newAddress){
       if(msg.sender != owner) throw;
       currentVersion = newAddress;
   }

   function(){
       if(!currentVersion.delegatecall(msg.data)) throw;
   }
}

您可以使用sendTransaction函式執行此操作，如下所示：

web3.eth.sendTransaction({
 from: sendingAccount,
 to: contract.address,
 data: yourData, // optional, if you want to pass data or specify another function to be called by delegateCall you do that here
 gas: requiredGas, // technically optional, but you almost certainly need more than the default 21k gas
 value: value //optional, if you want to pay the contract Ether
});

您可能不再需要它，但您可以將中繼地址重新輸入到實例合約：

contract Instance{
  function doSomething(){ ... }
}

然後如果 Relay.deployed() 位於地址 0x12345678，請執行以下操作：

in = Instance.at('0x12345678')
in.then(function(i){ i.doSomething(); })

引用自：https://ethereum.stackexchange.com/questions/23369