1# 启动ServiceAbility
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4ServiceAbility的启动与其他Ability并无区别，应用开发者可以在PageAbility中通过featureAbility的startAbility接口拉起ServiceAbility，在ServiceAbility中通过particleAbility的startAbility接口拉起ServiceAbility。ServiceAbility的启动规则详见[组件启动规则](component-startup-rules.md)章节。
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7如下示例展示了在PageAbility中通过startAbility启动bundleName为"com.example.myapplication"，abilityName为"ServiceAbility"的ServiceAbility的方法。启动FA模型的ServiceAbility时，需要在abilityName前拼接bundleName字符串。
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9```ts
10import featureAbility from '@ohos.ability.featureAbility';
11import Want from '@ohos.app.ability.Want';
12import promptAction from '@ohos.promptAction';
13import hilog from '@ohos.hilog';
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15const TAG: string = 'PageServiceAbility';
16const domain: number = 0xFF00;
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18@Entry
19@Component
20struct PageServiceAbility {
21  async startServiceAbility(): Promise<void> {
22    try {
23      hilog.info(domain, TAG, 'Begin to start ability');
24      let want: Want = {
25        bundleName: 'com.samples.famodelabilitydevelop',
26        abilityName: 'com.samples.famodelabilitydevelop.ServiceAbility'
27      };
28      await featureAbility.startAbility({ want });
29      promptAction.showToast({
30        message: 'start_service_success_toast'
31      });
32      hilog.info(domain, TAG, `Start ability succeed`);
33    } catch (error) {
34      hilog.error(domain, TAG, 'Start ability failed with ' + error);
35    }
36  }
37  build() {
38    // ...
39  }
40}
41```
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44执行上述代码后，Ability将通过[`startAbility()`](../reference/apis-ability-kit/js-apis-inner-application-uiAbilityContext.md#uiabilitycontextstartability)方法来启动ServiceAbility。
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47- 如果ServiceAbility尚未运行，则系统会先调用onStart()来初始化ServiceAbility，再回调Service的onCommand()方法来启动ServiceAbility。
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49- 如果ServiceAbility正在运行，则系统会直接回调ServiceAbility的onCommand()方法来启动ServiceAbility。
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