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Write

當您需要更新合約中的某些狀態時，可以與智能合約進行**"事務 "**交互。

導入 ethers 和 @kaiachain/ethers-ext 模塊，在 ethers.js 上添加 kaia 功能。

定義發件人地址和私人密鑰

使用指定的 kairos 測試網 URL 設置提供程序。以太坊中的提供者是訪問區塊鏈數據的只讀抽象。

此外，您還可以將提供商 URL 從 kairos 更改為 quicknode 。

用發件人私鑰和Web3 提供商創建錢包

設置由 solidity 代碼生成的 Abi

定義與之交互的合約地址

使用 ethers.Contract創建合同實例，填寫參數 contractAddr、abi、provider。您可以通過該實例讀寫合約

使用方法counter.number()獲取更新前的數字值

創建事務數據以更新編號值

如果已在區塊鏈中完成發送，wait函數將返回發送回執。

使用方法 counter.number() 獲取更新值 number

smartContractWrite.js


const ethers = require("ethers");
const { Wallet } = require("@kaiachain/ethers-ext");
const senderAddr = "0x24e8efd18d65bcb6b3ba15a4698c0b0d69d13ff7";
const senderPriv = "0x4a72b3d09c3d5e28e8652e0111f9c4ce252e8299aad95bb219a38eb0a3f4da49";
const provider = new ethers.providers.JsonRpcProvider("https://public-en-kairos.node.kaia.io");
const wallet = new Wallet(senderPriv, provider);
/* compiled in remix.ethereum.org (compiler: 0.8.18, optimizer: false)
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
contract Counter {
    uint256 public number;
    event SetNumber(uint256 number);
    constructor(uint256 initNumber) {
        number = initNumber;
    }
    function setNumber(uint256 newNumber) public {
        number = newNumber;
        emit SetNumber(number);
    }
    function increment() public {
        number++;
        emit SetNumber(number);
    }
}
*/
const abi = '[{"inputs":[{"internalType":"uint256","name":"initNumber","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"number","type":"uint256"}],"name":"SetNumber","type":"event"},{"inputs":[],"name":"increment","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"number","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newNumber","type":"uint256"}],"name":"setNumber","outputs":[],"stateMutability":"nonpayable","type":"function"}]';
const contractAddr = "0x95Be48607498109030592C08aDC9577c7C2dD505";
async function main() {
  const counter = new ethers.Contract(contractAddr, abi, wallet);
  console.log("number before", (await counter.number()).toString());
  const sentTx = await counter.increment();
  const receipt = await sentTx.wait();
  console.log("receipt", receipt);
  console.log("number after", (await counter.number()).toString());
}
main();

output


❯ node smartContractWrite.js
number before 291
receipt {
  to: '0x95Be48607498109030592C08aDC9577c7C2dD505',
  from: '0x24e8eFD18D65bCb6b3Ba15a4698c0b0d69d13fF7',
  contractAddress: null,
  transactionIndex: 0,
  gasUsed: BigNumber { _hex: '0x6d6e', _isBigNumber: true },
  logsBloom: '0x00000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000001200000002',
  blockHash: '0xbc6486ec825cf2388917f6c5c250af3f811bc838ea3f83382c1786d31b1eaaac',
  transactionHash: '0x07c87084001218f66e260cb63c207c676eae3bb4a338b7384457f6a4fdebd5da',
  logs: [
    {
      transactionIndex: 0,
      blockNumber: 148740640,
      transactionHash: '0x07c87084001218f66e260cb63c207c676eae3bb4a338b7384457f6a4fdebd5da',
      address: '0x95Be48607498109030592C08aDC9577c7C2dD505',
      topics: [Array],
      data: '0x0000000000000000000000000000000000000000000000000000000000000124',
      logIndex: 0,
      blockHash: '0xbc6486ec825cf2388917f6c5c250af3f811bc838ea3f83382c1786d31b1eaaac'
    }
  ],
  blockNumber: 148740640,
  confirmations: 1,
  cumulativeGasUsed: BigNumber { _hex: '0x6d6e', _isBigNumber: true },
  effectiveGasPrice: BigNumber { _hex: '0x05d21dba00', _isBigNumber: true },
  status: 1,
  type: 2,
  byzantium: true,
  events: [
    {
      transactionIndex: 0,
      blockNumber: 148740640,
      transactionHash: '0x07c87084001218f66e260cb63c207c676eae3bb4a338b7384457f6a4fdebd5da',
      address: '0x95Be48607498109030592C08aDC9577c7C2dD505',
      topics: [Array],
      data: '0x0000000000000000000000000000000000000000000000000000000000000124',
      logIndex: 0,
      blockHash: '0xbc6486ec825cf2388917f6c5c250af3f811bc838ea3f83382c1786d31b1eaaac',
      args: [Array],
      decode: [Function (anonymous)],
      event: 'SetNumber',
      eventSignature: 'SetNumber(uint256)',
      removeListener: [Function (anonymous)],
      getBlock: [Function (anonymous)],
      getTransaction: [Function (anonymous)],
      getTransactionReceipt: [Function (anonymous)]
    }
  ]
}
number after 292