#鸿蒙通关秘籍#如何检查及激活持久化权限？

检查和激活文件的持久化权限对于保持应用的文件访问非常重要。以下步骤展示如何实现：

1. 首先检查持久化权限
2. 如果权限有效，即可激活

javascript import { fileShare } from '@kit.CoreFileKit'; import { fileIo as fs } from '@kit.CoreFileKit';

async function activatePersistentPermission() { try { let uri = "file://docs/storage/Users/username/tmp.txt"; let policyInfo = { uri: uri, operationMode: fileShare.OperationMode.READ_MODE }; let policies = [policyInfo];

let results = await fileShare.checkPersistentPermission(policies);

for (let i = 0; i < results.length; i++) {
  if (results[i]) {
    await fileShare.activatePermission([policies[i]]);
    console.info("Permission activated successfully");
  }
}

let fd = await fs.open(uri);
await fs.close(fd);

} catch (error) { console.error('Failed to activate permission: ', JSON.stringify(error)); } }