tronweb如何在imtoken中updateAccountPermissions，请用js实现

要在 imToken 中使用 TronWeb 更新账户权限，需要遵循以下步骤：

1. 创建 TronWeb 实例

const HttpProvider = TronWeb.providers.HttpProvider;
const fullNode = new HttpProvider("https://api.trongrid.io");
const solidityNode = new HttpProvider("https://api.trongrid.io");
const eventServer = new HttpProvider("https://api.trongrid.io");
const tronWeb = new TronWeb(fullNode, solidityNode, eventServer);

2. 获取账户的私钥

const privateKey = "your private key";

3. 创建 PermissionUpdate 对象

const permissionUpdate = {
    owner_address: "your address",
    owner_permission: {
        threshold: 2,
        keys: [
            {
                address: "new address",
                weight: 1
            }
        ],
        accounts: [
            {
                address: "address to remove",
                permission_name: "active",
                weight: 0
            }
        ]
    },
    witness_permission: {
        threshold: 2,
        keys: [
            {
                address: "new address",
                weight: 1
            }
        ]
    },
    actives: [
        {
            type: 2,
            permission: {
                threshold: 1,
                keys: [
                    {
                        address: "new address",
                        weight: 1
                    }
                ],
                accounts: [
                    {
                        address: "address to remove",
                        permission_name: "active",
                        weight: 0
                    }
                ]
            }
        }
    ],
    description: "update account permissions"
};

4. 签名并广播交易

tronWeb.transactionBuilder.updateAccountPermissions(permissionUpdate, privateKey).then((signedTransaction) => {
    tronWeb.trx.sendRawTransaction(signedTransaction, (err, txid) => {
        if (err) {
            console.error(err);
        } else {
            console.log(`Transaction ID: ${txid}`);
        }
    });
}).catch((err) => {
    console.error(err);
});

以上代码仅供参考，具体实现可能需要做一些修改以适应你的需求。