1# API Switching Overview 2 3 4Due to the differences in the thread model and process model, certain APIs can be used only in the FA model. They are marked with **FAModelOnly** in the SDK. When switching an application from the FA model to the stage model, replace the APIs marked with **FAModelOnly** in the application with the APIs supported in the stage model. This topic uses the switching of **startAbility()** as an example. 5 6 7 8 9 10- Sample code of **startAbility()** in the FA model: 11 12 ```ts 13 import fa from '@ohos.ability.featureAbility'; 14 import { BusinessError } from '@ohos.base'; 15 16 fa.startAbility({ 17 "want": { 18 bundleName: "com.example.myapplication", 19 abilityName: "com.example.myapplication.EntryAbility" 20 } 21 }).then((data) => { 22 console.info('startAbility success'); 23 }).catch((error: BusinessError) => { 24 console.error('startAbility failed.'); 25 }) 26 ``` 27 28- Sample code of **startAbility()** in the stage model: 29 30 ```ts 31 import Want from '@ohos.app.ability.Want'; 32 33 // Context is a member of the ability object and is required for invoking inside a non-ability object. 34 // Pass in the Context object. 35 let wantInfo: Want = { 36 bundleName: "com.example.myapplication", 37 abilityName: "EntryAbility" 38 }; 39 this.context.startAbility(wantInfo).then(() => { 40 console.info('startAbility success.'); 41 }).catch((error: BusinessError) => { 42 console.error('startAbility failed.'); 43 }) 44 ``` 45
