If a developer needs to use the JavaScript UI framework to display the bar chart of the month's product sales, he can use the chart component to implement this function.
Which of the following statements is true about the use of the previewer?
HarmonyOS supports developers to customize permissions in the "reqPermissions" field to access permission-protected objects
When developing a HarmonyOS application, a developer receives the following product request: If a user logs in to the same HarmonyOS account on device A and device B, the user can log in to the app on device A and synchronize the application account authentication information to account B as needed. After the account authentication information is synchronized, the user can open the application on device B and log in directly without entering the application account authentication information again. Which of the following descriptions of this scene is correct?
In a HarmonyOS application, there must be one and only one HAP of the feature type.