问连接到我在多边形测试网上的智能合同(孟买)

EN

import maticjs from '@maticnetwork/maticjs';
const { POSClient,use } = maticjs;
import maticjsWeb3 from '@maticnetwork/maticjs-web3';
const { Web3ClientPlugin } = maticjsWeb3;
import HDWalletProvider from "@truffle/hdwallet-provider";
import * as dotenv from 'dotenv'
dotenv.config()

// install web3 plugin
use(Web3ClientPlugin);

const posClient = new POSClient();

let fromAddress = "<my private address (also the miner of the contract)>";

await posClient.init({
    network: 'testnet',
    version: 'mumbai',
    parent: {
      provider: new HDWalletProvider(process.env.MNEMONIC, process.env.MUMBAI_RPC_URL)
    },
    child: {
      provider: new HDWalletProvider(process.env.MNEMONIC, process.env.MUMBAI_RPC_URL),
      defaultConfig: {
        from : fromAddress
      }
    }
});

const erc20ChildToken = posClient.erc20("<MyContract address>");

const balance = await erc20ChildToken.getBalance(fromAddress);
console.log('balance', balance/10**18);


const result = await erc20ChildToken.stake(10);
console.log('result ', result)