如何初始化waveskeeper对象？

npm install @waves/keeper

import { Keeper } from '@waves/keeper';

// 创建 Waves Keeper 实例
const keeper = new Keeper('testnet'); // 或 'mainnet' 根据您的需求

if (typeof window.wavesKeeper !== 'undefined') {
    console.log('Waves Keeper is available');
} else {
    console.log('Please install Waves Keeper extension');
}

async function connectToKeeper() {
    try {
        const address = await keeper.connect();
        console.log('Connected to Waves Keeper with address:', address);
    } catch (error) {
        console.error('Failed to connect to Waves Keeper:', error);
    }
}

// 调用连接函数
connectToKeeper();

async function sendTransaction() {
    const tx = {
        type: 4, // 交易类型，例如转账
        data: {
            amount: 1000000, // 转账金额（以最小单位表示）
            recipient: 'recipientAddress', // 接收者地址
            fee: 100000, // 交易费用
        },
    };

    try {
        const txId = await keeper.signAndPublish(tx);
        console.log('Transaction sent with ID:', txId);
    } catch (error) {
        console.error('Failed to send transaction:', error);
    }
}

// 调用发送交易函数
sendTransaction();