步骤 1创建账户工厂

import { AccountMetamaskFactory } from '@aeternity/aepp-sdk';

// 创建 MetaMask 账户工厂
const accountFactory = new AccountMetamaskFactory();

步骤 2初始化账户

// 通过索引创建账户实例
// 首次使用时会提示用户安装/连接 Æternity Snap
const account = await accountFactory.initialize(0);

console.log(account.address); // 'ak_2dA...'

// 签名交易（在 MetaMask 中确认）
const signedTx = await account.signTransaction('tx_...');
console.log(signedTx); // 'tx_...' (带签名)

保存账户的 index 和 address 属性，可在应用重启后恢复：

import { AccountMetamask, AccountMetamaskFactory } from '@aeternity/aepp-sdk';

// 保存
const accountIndex = accountToPersist.index;
const accountAddress = accountToPersist.address;
localStorage.setItem('metamaskAccount', JSON.stringify({ index: accountIndex, address: accountAddress }));

// 恢复
const saved = JSON.parse(localStorage.getItem('metamaskAccount'));
const accountFactory = new AccountMetamaskFactory();
const restoredAccount = new AccountMetamask(
  accountFactory.provider, 
  saved.index, 
  saved.address
);

自动发现链上已使用过的账户：

import { Node } from '@aeternity/aepp-sdk';

const node = new Node('https://testnet.aeternity.io');

// 发现所有链上活跃的账户
const accounts = await accountFactory.discover(node);

console.log('发现账户:');
accounts.forEach(acc => console.log(acc.address));

用户拒绝操作时会抛出异常：

try {
  const account = await accountFactory.initialize(0);
} catch (err) {
  // err 是一个普通对象
  if (err.code === 4001) {
    console.log('用户拒绝了请求');
    // err.message === 'User rejected the request.'
  } else if (err.code === -32602) {
    console.log('Snap 降级被请求');
  }
}