# @ohos.app.ability.StartOptions (StartOptions)

**StartOptions** is used as an input parameter of [startAbility()](js-apis-inner-application-uiAbilityContext.md#uiabilitycontextstartability-1) to specify the window mode of an ability.

> **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

```ts
import { StartOptions } from '@kit.AbilityKit';
```

## Properties

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

| Name| Type| Read-only| Optional| Description|
| -------- | -------- | -------- | -------- | -------- |
| windowMode<sup>12+<sup> | number | No| Yes| Window mode when the ability is started. For details, see [WindowMode](./js-apis-app-ability-abilityConstant.md#windowmode12).|
| displayId | number | No| Yes| Display ID mode. The default value is **0**, indicating the current display.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| withAnimation<sup>11+</sup> | boolean | No| Yes| Whether the ability has the animation effect.|
| windowLeft<sup>11+</sup> | number | No| Yes| Left position of the window.|
| windowTop<sup>11+</sup> | number | No| Yes| Top position of the window.|
| windowWidth<sup>11+</sup> | number | No| Yes| Width of the window.|
| windowHeight<sup>11+</sup> | number | No| Yes| Height of the window.|
| processMode<sup>12+</sup> | [contextConstant.ProcessMode](js-apis-app-ability-contextConstant.md#processmode12) | No| Yes| Process mode.<br>**Constraints**:<br>1. This property takes effect only on tablets.<br>2. This property takes effect only in [UIAbilityContext.startAbility](js-apis-inner-application-uiAbilityContext.md#uiabilitycontextstartability-1).<br>3. **processMode** and **startupVisibility** must be set in pair.|
| startupVisibility<sup>12+</sup> | [contextConstant.StartupVisibility](js-apis-app-ability-contextConstant.md#startupvisibility12) | Yes| No| Visibility of the ability after it is started.<br>**Constraints**:<br>1. This property takes effect only on tablets.<br>2. This property takes effect only in [UIAbilityContext.startAbility](js-apis-inner-application-uiAbilityContext.md#uiabilitycontextstartability-1).<br>3. **processMode** and **startupVisibility** must be set in pair.|

**Example**

  ```ts
  import { UIAbility, Want, StartOptions } from '@kit.AbilityKit';
  import { BusinessError } from '@kit.BasicServicesKit';

  export default class EntryAbility extends UIAbility {

    onForeground() {
      let want: Want = {
        deviceId: '',
        bundleName: 'com.example.myapplication',
        abilityName: 'EntryAbility'
      };
      let options: StartOptions = {
        displayId: 0
      };

      try {
        this.context.startAbility(want, options, (err: BusinessError) => {
          if (err.code) {
            // Process service logic errors.
            console.error(`startAbility failed, code is ${err.code}, message is ${err.message}`);
            return;
          }
          // Carry out normal service processing.
          console.info('startAbility succeed');
        });
      } catch (err) {
        // Process input parameter errors.
        let code = (err as BusinessError).code;
        let message = (err as BusinessError).message;
        console.error(`startAbility failed, code is ${code}, message is ${message}`);
      }
    }
  }
  ```