# StartOptions

The **StartOptions** module implements ability startup options.

> **NOTE**
>
> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
> The APIs of this module can be used only in the stage model.

## Modules to Import

```
import StartOptions from '@ohos.application.StartOptions';
```

## Attributes

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

| Name| Readable| Writable| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- | -------- | -------- |
| [windowMode](js-apis-application-abilityConstant.md#AbilityConstant.WindowMode) | Yes| No| number | No| Window mode.|
| displayId | Yes| No| number | No| Display ID.|