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您可以通過 "調用 "RPC API 調用智能合約中的函數。 在這裡可以調用的功能僅限於視圖函數，不會改變合約中的任何狀態。

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

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 。

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創建合約實例，填寫參數 contractAddr、abi、provider。 您可以通過該實例讀寫合約

使用counter.number()方法從合約中獲取數字的值

SmartContractView.js

const ethers = require("ethers");

const provider = new ethers.providers.JsonRpcProvider("https://public-en-kairos.node.kaia.io");

/* 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, provider);

const number = await counter.number();

console.log("number", number.toString());

}

main();

output

❯ js SmartContractView.js

number 291