javascript - 无法通过 JavaScript 更新 solidity 合约的状态变量

Question

我有以下契约(Contract)，只想更新其状态变量值，即 totalSupply。但是，当我尝试通过 JavaScript 代码(如下所示)调用其函数(即 setTotalSupply)来尝试执行此任务时，tts 值不会更新。

pragma solidity 0.5.1;

contract MyContract {

    uint256 totalSupply; 
    mapping(address => uint256) public balances;
    address owner;

    constructor(address payable _wallet) public {
        totalSupply = 10;
        owner = _wallet;
    }

    function () external payable{
        buyToken();
    }

    function buyToken() public payable {
        require(totalSupply >= (msg.value/1000000000000000000)*2);
        balances[msg.sender] += (msg.value/1000000000000000000)*2;
        // wallet.tranfer(msg.value);
        totalSupply -=(msg.value/1000000000000000000)*2;

    }
    function getTotalSupply()public view returns  (uint256 ){
        return totalSupply;
    }
       function setTotalSupply(uint256 newSupply)public {
        require(msg.sender == owner && totalSupply<1);
        totalSupply = newSupply;

    }
    function getBalance() public view returns  (uint) {
        return address(this).balance;
    }

}

我只想更新它的值(value)，即总供应量。以下是我用于上述目的的 JavaScript 代码

var Tx = require('ethereumjs-tx').Transaction
const Web3 = require('web3');
const provider = new Web3.providers.HttpProvider("https://ropsten.infura.io/v3/7fb0bdc97c.....");
 const web3 = new Web3(provider);

var contract1  = new web3.eth.Contract(contractABI, contractAddress1)
const txData2 = contract1.methods.setTotalSupply(10).encodeABI(); 
setSupplyBalance(contractAddress1, txData2);

function setSupplyBalance(contractAddress, txData ){

web3.eth.getTransactionCount(account1, (err, txCount) => {
      txObject = {
      nonce:    web3.utils.toHex(txCount),
      gasLimit: web3.utils.toHex(1000000),
      gasPrice: web3.utils.toHex(web3.utils.toWei('100', 'gwei')),
      to: contractAddress,
      value: web3.utils.toHex(web3.utils.toWei('0', 'ether')),
      data:txData
    }




  const tx = new Tx(txObject, {chain:'ropsten', hardfork: 'petersburg'})
// sign the trx
tx.sign(privateKey1)

serializedTx = tx.serialize()

raw = '0x' + serializedTx.toString('hex')

  web3.eth.sendSignedTransaction (raw, (err, txHash)=> {
    console.log('err:', err)
    console.log('txHash', txHash)
  })

  })

}

Answer 1

更新

我想我找到了原因。在部署合约时，您没有在构造函数中为 _wallet 变量提供正确的地址，因此它不会通过 setTotalSupply 中的 require 语句。

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调用setTotalSupply时totalSupply是否等于0？

因为你在setTotalSupply中有一条require语句，如果不为0，交易会被回滚，totalSupply的值不会更新。