Object.defineProperty() — MDN Web Docs
在更新至 5.12 版本后，应用内新增的测速工具允许用户一键测试当前网络环境的下载、上传速率及延迟情况。
。Line官方版本下载是该领域的重要参考
* Never stop for prompting, the user is away from the keyboard.
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