1e41f4b71Sopenharmony_ci# @ohos.app.ability.Want (Want)
2e41f4b71Sopenharmony_ci
3e41f4b71Sopenharmony_ciWant是对象间信息传递的载体,可以用于应用组件间的信息传递。Want的使用场景之一是作为startAbility的参数,其包含了指定的启动目标,以及启动时需携带的相关数据,例如bundleName和abilityName字段分别指明目标Ability所在应用的包名以及对应包内的Ability名称。当UIAbilityA需要启动UIAbilityB并传入一些数据时,可使用Want作为载体将这些数据传递给UIAbilityB。
4e41f4b71Sopenharmony_ci
5e41f4b71Sopenharmony_ci> **说明:**
6e41f4b71Sopenharmony_ci>
7e41f4b71Sopenharmony_ci> 本模块首批接口从API version 9 开始支持。后续版本的新增接口,采用上角标单独标记接口的起始版本。
8e41f4b71Sopenharmony_ci
9e41f4b71Sopenharmony_ci## 导入模块
10e41f4b71Sopenharmony_ci
11e41f4b71Sopenharmony_ci```ts
12e41f4b71Sopenharmony_ciimport { Want } from '@kit.AbilityKit';
13e41f4b71Sopenharmony_ci```
14e41f4b71Sopenharmony_ci
15e41f4b71Sopenharmony_ci## 属性
16e41f4b71Sopenharmony_ci
17e41f4b71Sopenharmony_ci**原子化服务API:** 从API version 11开始,该接口支持在原子化服务中使用。
18e41f4b71Sopenharmony_ci
19e41f4b71Sopenharmony_ci**系统能力**:SystemCapability.Ability.AbilityBase
20e41f4b71Sopenharmony_ci
21e41f4b71Sopenharmony_ci| 名称        | 类型                 | 必填 | 说明                                                         |
22e41f4b71Sopenharmony_ci| ----------- | -------------------- | ---- | ------------------------------------------------------------ |
23e41f4b71Sopenharmony_ci| deviceId    | string               | 否   | 表示运行指定Ability的设备ID。如果未设置该字段,则表明指定本设备。                                |
24e41f4b71Sopenharmony_ci| bundleName   | string               | 否   | 表示待启动Ability所在的应用Bundle名称。 |
25e41f4b71Sopenharmony_ci| moduleName | string | 否 | 表示待启动的Ability所属的模块名称。 |
26e41f4b71Sopenharmony_ci| abilityName  | string               | 否   | 表示待启动Ability名称。如果在Want中该字段同时指定了BundleName和AbilityName,则Want可以直接匹配到指定的Ability。AbilityName需要在一个应用的范围内保证唯一。 |
27e41f4b71Sopenharmony_ci| action | string               | 否   | 表示要执行的通用操作(如:查看、分享、应用详情)。在隐式Want中,您可以定义该字段,配合uri或parameters来表示对数据要执行的操作。隐式Want定义及匹配规则请参见[显式Want与隐式Want匹配规则](../../application-models/explicit-implicit-want-mappings.md)。             |
28e41f4b71Sopenharmony_ci| entities | Array\<string> | 否 | 表示目标Ability额外的类别信息(如:浏览器、视频播放器)。在隐式Want中是对action字段的补充。在隐式Want中,您可以定义该字段,来过滤匹配Ability类型。 |
29e41f4b71Sopenharmony_ci| uri | string | 否 | 表示携带的数据,一般配合type使用,指明待处理的数据类型。如果在Want中指定了uri,则Want将匹配指定的Uri信息,包括`scheme`、`schemeSpecificPart`、`authority`和`path`信息。 |
30e41f4b71Sopenharmony_ci| type | string | 否 | 表示MIME type类型描述,打开文件的类型,主要用于文管打开文件。比如:'text/xml' 、 'image/*'等,MIME定义请参见https://www.iana.org/assignments/media-types/media-types.xhtml?utm_source=ld246.com。 |
31e41f4b71Sopenharmony_ci| parameters   | Record\<string, Object> | 否   | 表示WantParams描述。<br />一、以下Key均由系统赋值,开发者手动修改也不会生效,系统在数据传递时会自动修改为实际值。<br />- ohos.aafwk.param.callerPid:表示拉起方的pid,值为字符串类型。<br />- ohos.aafwk.param.callerBundleName:表示拉起方的BundleName,值为字符串类型。<br />- ohos.aafwk.param.callerAbilityName:表示拉起方的AbilityName,值为字符串类型。<br />- ohos.aafwk.param.callerNativeName:表示native调用时拉起方的进程名,值为字符串类型。<br />- ohos.aafwk.param.callerAppId:表示拉起应用的AppId信息,值为字符串类型。<br />- ohos.aafwk.param.callerAppIdentifier:表示拉起应用的AppIdentifier信息,值为字符串类型。<br />- ohos.aafwk.param.callerToken:表示拉起方的token,值为字符串类型。<br />- ohos.aafwk.param.callerUid:表示[BundleInfo](js-apis-bundleManager-bundleInfo.md#bundleinfo-1)中的uid,应用包里应用程序的uid,值为数值类型。<br />- component.startup.newRules:表示是否启用新的管控规则,值为布尔类型。<br />- moduleName:表示拉起方的moduleName,值为字符串类型。<br />- ability.params.backToOtherMissionStack:表示是否支持跨任务链返回,值为布尔类型。<br />- ohos.ability.params.abilityRecoveryRestart:表示当前Ability是否发生了故障恢复重启,值为布尔类型。<br />- ohos.extra.param.key.contentTitle:表示原子化服务支持分享的标题,值为字符串类型。<br />- ohos.extra.param.key.shareAbstract:表示原子化服务支持分享的内容,值为字符串类型。<br />- ohos.extra.param.key.shareUrl:表示原子化服务支持分享的链接,值为字符串类型。<br />- ohos.extra.param.key.supportContinuePageStack:表示在跨端迁移过程中是否迁移页面栈信息,值为布尔类型,默认值为true,自动迁移页面栈信息。<br />- ohos.extra.param.key.supportContinueSourceExit:表示跨端迁移源端应用是否退出,值为布尔类型,默认值为true,源端应用自动退出。<br />- ohos.extra.param.key.showMode:表示拉起原子化服务的展示模式,值为枚举类型[wantConstant.ShowMode](js-apis-app-ability-wantConstant.md#showmode12)。<br />- ohos.dlp.params.sandbox:表示数据防泄漏(DLP)文件才会涉及。仅系统应用涉及。<br />- ohos.dlp.params.bundleName:表示数据防泄漏(DLP)的BundleName,值为字符串类型。仅系统应用涉及。<br />- ohos.dlp.params.moduleName:表示数据防泄漏(DLP)的moduleName,值为字符串类型。仅系统应用涉及。<br />- ohos.dlp.params.abilityName:表示数据防泄漏(DLP)的AbilityName,值为字符串类型。仅系统应用涉及。<br />- 	ohos.dlp.params.index:表示数据防泄漏(DLP)的索引,值为数值类型。仅系统应用涉及。<br />- ohos.ability.params.asssertFaultSessionId:表示AssertFault的会话ID,值为字符串类型。仅系统应用涉及。<br /><br />二、以下是由系统定义、开发者按需赋值的Key。<br />- ability.params.stream:指示携带的文件URI要授权给目标方,值为string类型的文件URI数组。<br />- ohos.extra.param.key.appCloneIndex:指示分身应用索引。<br /><br />三、除了上述两种情况,应用间还可以相互约定传入的键值对。<br /><br />**说明**:<br/>want的Params操作的常量的具体信息请参考[wantConstant](js-apis-app-ability-wantConstant.md)。<br/>需注意,WantParams支持传输的最大数据量为200KB。当数据量超过200KB时,请使用[WriteRawDataBuffer](../apis-ipc-kit/js-apis-rpc.md#writerawdatabuffer11)或[uri](../apis-arkts/js-apis-uri.md)的方式进行数据传输。<br/>parameters的Value值仅支持基本数据类型:String、Number、Boolean、Object、undefined和null,不支持传递Object内部的function。 |
32e41f4b71Sopenharmony_ci| [flags](js-apis-ability-wantConstant.md#flags) | number | 否 | 表示处理Want的方式。默认传数字。<br />例如通过wantConstant.Flags.FLAG_ABILITY_CONTINUATION表示是否以设备间迁移方式启动Ability。 |
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34e41f4b71Sopenharmony_ci**示例:**
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36e41f4b71Sopenharmony_ci- 基础用法:在UIAbility对象中调用,示例中的context的获取方式请参见[获取UIAbility的上下文信息](../../application-models/uiability-usage.md#获取uiability的上下文信息)。
37e41f4b71Sopenharmony_ci
38e41f4b71Sopenharmony_ci  ```ts
39e41f4b71Sopenharmony_ci  import { common, Want } from '@kit.AbilityKit';
40e41f4b71Sopenharmony_ci  import { BusinessError } from '@kit.BasicServicesKit';
41e41f4b71Sopenharmony_ci
42e41f4b71Sopenharmony_ci  let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
43e41f4b71Sopenharmony_ci  let want: Want = {
44e41f4b71Sopenharmony_ci    deviceId: '', // deviceId为空表示本设备
45e41f4b71Sopenharmony_ci    bundleName: 'com.example.myapplication',
46e41f4b71Sopenharmony_ci    abilityName: 'FuncAbility',
47e41f4b71Sopenharmony_ci    moduleName: 'entry' // moduleName非必选
48e41f4b71Sopenharmony_ci  };
49e41f4b71Sopenharmony_ci
50e41f4b71Sopenharmony_ci  context.startAbility(want, (err: BusinessError) => {
51e41f4b71Sopenharmony_ci    if (err.code) {
52e41f4b71Sopenharmony_ci      // 显式拉起Ability,通过bundleName、abilityName和moduleName可以唯一确定一个Ability
53e41f4b71Sopenharmony_ci      console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
54e41f4b71Sopenharmony_ci    }
55e41f4b71Sopenharmony_ci  });
56e41f4b71Sopenharmony_ci  ```
57e41f4b71Sopenharmony_ci
58e41f4b71Sopenharmony_ci- 目前支持的数据类型有:字符串、数字、布尔、对象、数组和文件描述符等。
59e41f4b71Sopenharmony_ci
60e41f4b71Sopenharmony_ci    * 字符串(String)
61e41f4b71Sopenharmony_ci        ```ts
62e41f4b71Sopenharmony_ci        import { common, Want } from '@kit.AbilityKit';
63e41f4b71Sopenharmony_ci        import { BusinessError } from '@kit.BasicServicesKit';
64e41f4b71Sopenharmony_ci
65e41f4b71Sopenharmony_ci        let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
66e41f4b71Sopenharmony_ci        let want: Want = {
67e41f4b71Sopenharmony_ci          bundleName: 'com.example.myapplication',
68e41f4b71Sopenharmony_ci          abilityName: 'FuncAbility',
69e41f4b71Sopenharmony_ci          parameters: {
70e41f4b71Sopenharmony_ci            keyForString: 'str',
71e41f4b71Sopenharmony_ci          },
72e41f4b71Sopenharmony_ci        };
73e41f4b71Sopenharmony_ci
74e41f4b71Sopenharmony_ci        context.startAbility(want, (err: BusinessError) => {
75e41f4b71Sopenharmony_ci          if (err.code) {
76e41f4b71Sopenharmony_ci            console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
77e41f4b71Sopenharmony_ci          }
78e41f4b71Sopenharmony_ci        });
79e41f4b71Sopenharmony_ci        ```
80e41f4b71Sopenharmony_ci    * 数字(Number)
81e41f4b71Sopenharmony_ci        ```ts
82e41f4b71Sopenharmony_ci        import { common, Want } from '@kit.AbilityKit';
83e41f4b71Sopenharmony_ci
84e41f4b71Sopenharmony_ci        let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
85e41f4b71Sopenharmony_ci        let want: Want = {
86e41f4b71Sopenharmony_ci          bundleName: 'com.example.myapplication',
87e41f4b71Sopenharmony_ci          abilityName: 'FuncAbility',
88e41f4b71Sopenharmony_ci          parameters: {
89e41f4b71Sopenharmony_ci            keyForInt: 100,
90e41f4b71Sopenharmony_ci            keyForDouble: 99.99,
91e41f4b71Sopenharmony_ci          },
92e41f4b71Sopenharmony_ci        };
93e41f4b71Sopenharmony_ci
94e41f4b71Sopenharmony_ci        context.startAbility(want, (err) => {
95e41f4b71Sopenharmony_ci          if (err.code) {
96e41f4b71Sopenharmony_ci            console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
97e41f4b71Sopenharmony_ci          }
98e41f4b71Sopenharmony_ci        });
99e41f4b71Sopenharmony_ci        ```
100e41f4b71Sopenharmony_ci    * 布尔(Boolean)
101e41f4b71Sopenharmony_ci        ```ts
102e41f4b71Sopenharmony_ci        import { common, Want } from '@kit.AbilityKit';
103e41f4b71Sopenharmony_ci        import { BusinessError } from '@kit.BasicServicesKit';
104e41f4b71Sopenharmony_ci
105e41f4b71Sopenharmony_ci        let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
106e41f4b71Sopenharmony_ci        let want: Want = {
107e41f4b71Sopenharmony_ci          bundleName: 'com.example.myapplication',
108e41f4b71Sopenharmony_ci          abilityName: 'FuncAbility',
109e41f4b71Sopenharmony_ci          parameters: {
110e41f4b71Sopenharmony_ci            keyForBool: true,
111e41f4b71Sopenharmony_ci          },
112e41f4b71Sopenharmony_ci        };
113e41f4b71Sopenharmony_ci
114e41f4b71Sopenharmony_ci        context.startAbility(want, (err: BusinessError) => {
115e41f4b71Sopenharmony_ci          if (err.code) {
116e41f4b71Sopenharmony_ci            console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
117e41f4b71Sopenharmony_ci          }
118e41f4b71Sopenharmony_ci        });
119e41f4b71Sopenharmony_ci        ```
120e41f4b71Sopenharmony_ci    * 对象(Object)
121e41f4b71Sopenharmony_ci        ```ts
122e41f4b71Sopenharmony_ci        import { common, Want } from '@kit.AbilityKit';
123e41f4b71Sopenharmony_ci        import { BusinessError } from '@kit.BasicServicesKit';
124e41f4b71Sopenharmony_ci
125e41f4b71Sopenharmony_ci        let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
126e41f4b71Sopenharmony_ci        let want: Want = {
127e41f4b71Sopenharmony_ci          bundleName: 'com.example.myapplication',
128e41f4b71Sopenharmony_ci          abilityName: 'FuncAbility',
129e41f4b71Sopenharmony_ci          parameters: {
130e41f4b71Sopenharmony_ci            keyForObject: {
131e41f4b71Sopenharmony_ci              keyForObjectString: 'str',
132e41f4b71Sopenharmony_ci              keyForObjectInt: -200,
133e41f4b71Sopenharmony_ci              keyForObjectDouble: 35.5,
134e41f4b71Sopenharmony_ci              keyForObjectBool: false,
135e41f4b71Sopenharmony_ci            },
136e41f4b71Sopenharmony_ci          },
137e41f4b71Sopenharmony_ci        };
138e41f4b71Sopenharmony_ci
139e41f4b71Sopenharmony_ci        context.startAbility(want, (err: BusinessError) => {
140e41f4b71Sopenharmony_ci          if (err.code) {
141e41f4b71Sopenharmony_ci            console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
142e41f4b71Sopenharmony_ci          }
143e41f4b71Sopenharmony_ci        });
144e41f4b71Sopenharmony_ci        ```
145e41f4b71Sopenharmony_ci    * 数组(Array)
146e41f4b71Sopenharmony_ci
147e41f4b71Sopenharmony_ci        ```ts
148e41f4b71Sopenharmony_ci        import { common, Want } from '@kit.AbilityKit';
149e41f4b71Sopenharmony_ci        import { BusinessError } from '@kit.BasicServicesKit';
150e41f4b71Sopenharmony_ci
151e41f4b71Sopenharmony_ci        let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
152e41f4b71Sopenharmony_ci        let want: Want = {
153e41f4b71Sopenharmony_ci          bundleName: 'com.example.myapplication',
154e41f4b71Sopenharmony_ci          abilityName: 'FuncAbility',
155e41f4b71Sopenharmony_ci          parameters: {
156e41f4b71Sopenharmony_ci            keyForArrayString: ['str1', 'str2', 'str3'],
157e41f4b71Sopenharmony_ci            keyForArrayInt: [100, 200, 300, 400],
158e41f4b71Sopenharmony_ci            keyForArrayDouble: [0.1, 0.2],
159e41f4b71Sopenharmony_ci            keyForArrayObject: [{ obj1: 'aaa' }, { obj2: 100 }],
160e41f4b71Sopenharmony_ci          },
161e41f4b71Sopenharmony_ci        };
162e41f4b71Sopenharmony_ci
163e41f4b71Sopenharmony_ci        context.startAbility(want, (err: BusinessError) => {
164e41f4b71Sopenharmony_ci          if (err.code) {
165e41f4b71Sopenharmony_ci            console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
166e41f4b71Sopenharmony_ci          }
167e41f4b71Sopenharmony_ci        });
168e41f4b71Sopenharmony_ci        ```
169e41f4b71Sopenharmony_ci
170e41f4b71Sopenharmony_ci    * 文件描述符(FD)
171e41f4b71Sopenharmony_ci
172e41f4b71Sopenharmony_ci        ```ts
173e41f4b71Sopenharmony_ci        import { fileIo } from '@kit.CoreFileKit';
174e41f4b71Sopenharmony_ci        import { common, Want } from '@kit.AbilityKit';
175e41f4b71Sopenharmony_ci        import { BusinessError } from '@kit.BasicServicesKit';
176e41f4b71Sopenharmony_ci
177e41f4b71Sopenharmony_ci        let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
178e41f4b71Sopenharmony_ci        let fd: number = 0;
179e41f4b71Sopenharmony_ci
180e41f4b71Sopenharmony_ci        try {
181e41f4b71Sopenharmony_ci          fd = fileIo.openSync('/data/storage/el2/base/haps/pic.png').fd;
182e41f4b71Sopenharmony_ci        } catch(err) {
183e41f4b71Sopenharmony_ci          let code = (err as BusinessError).code;
184e41f4b71Sopenharmony_ci          let message = (err as BusinessError).message;
185e41f4b71Sopenharmony_ci          console.error(`Failed to openSync. Code: ${code}, message: ${message}`);
186e41f4b71Sopenharmony_ci        }
187e41f4b71Sopenharmony_ci        let want: Want = {
188e41f4b71Sopenharmony_ci          deviceId: '', // deviceId为空表示本设备
189e41f4b71Sopenharmony_ci          bundleName: 'com.example.myapplication',
190e41f4b71Sopenharmony_ci          abilityName: 'FuncAbility',
191e41f4b71Sopenharmony_ci          moduleName: 'entry', // moduleName非必选
192e41f4b71Sopenharmony_ci          parameters: {
193e41f4b71Sopenharmony_ci            'keyFd': { 'type': 'FD', 'value': fd } // {'type':'FD', 'value':fd}是固定用法,用于表示该数据是FD
194e41f4b71Sopenharmony_ci          }
195e41f4b71Sopenharmony_ci        };
196e41f4b71Sopenharmony_ci
197e41f4b71Sopenharmony_ci        context.startAbility(want, (err: BusinessError) => {
198e41f4b71Sopenharmony_ci          if (err.code) {
199e41f4b71Sopenharmony_ci            console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
200e41f4b71Sopenharmony_ci          }
201e41f4b71Sopenharmony_ci        });
202e41f4b71Sopenharmony_ci        ```
203e41f4b71Sopenharmony_ci
204e41f4b71Sopenharmony_ci    * parameter参数用法:parameter携带开发者自定义参数,由UIAbilityA传递给UIAbilityB,并在UIAbilityB中进行获取。
205e41f4b71Sopenharmony_ci
206e41f4b71Sopenharmony_ci        ```ts
207e41f4b71Sopenharmony_ci        // (1) UIAbilityA通过startability启动UIAbilityB
208e41f4b71Sopenharmony_ci        import { common, Want } from '@kit.AbilityKit';
209e41f4b71Sopenharmony_ci        import { BusinessError } from '@kit.BasicServicesKit';
210e41f4b71Sopenharmony_ci
211e41f4b71Sopenharmony_ci        let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
212e41f4b71Sopenharmony_ci        let want: Want = {
213e41f4b71Sopenharmony_ci          bundleName: 'com.example.myapplication',
214e41f4b71Sopenharmony_ci          abilityName: 'UIAbilityB',
215e41f4b71Sopenharmony_ci          parameters: {
216e41f4b71Sopenharmony_ci            developerParameters: 'parameters',
217e41f4b71Sopenharmony_ci          },
218e41f4b71Sopenharmony_ci        };
219e41f4b71Sopenharmony_ci
220e41f4b71Sopenharmony_ci        context.startAbility(want, (err: BusinessError) => {
221e41f4b71Sopenharmony_ci          if (err.code) {
222e41f4b71Sopenharmony_ci            console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
223e41f4b71Sopenharmony_ci          }
224e41f4b71Sopenharmony_ci        });
225e41f4b71Sopenharmony_ci        ```
226e41f4b71Sopenharmony_ci
227e41f4b71Sopenharmony_ci        ```ts
228e41f4b71Sopenharmony_ci        // (2) 以UIAbilityB实例首次启动为例,会进入到UIAbilityB的onCreate生命周期
229e41f4b71Sopenharmony_ci        import { UIAbility, Want, AbilityConstant } from '@kit.AbilityKit';
230e41f4b71Sopenharmony_ci
231e41f4b71Sopenharmony_ci        class UIAbilityB extends UIAbility {
232e41f4b71Sopenharmony_ci          onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
233e41f4b71Sopenharmony_ci            console.log(`onCreate, want parameters: ${want.parameters?.developerParameters}`);
234e41f4b71Sopenharmony_ci          }
235e41f4b71Sopenharmony_ci        }
236e41f4b71Sopenharmony_ci        ```
237e41f4b71Sopenharmony_ci    * parameter参数中[wantConstant](js-apis-app-ability-wantConstant.md)的Key的使用方法。
238e41f4b71Sopenharmony_ci
239e41f4b71Sopenharmony_ci        ```ts
240e41f4b71Sopenharmony_ci        import { common, Want, wantConstant } from '@kit.AbilityKit';
241e41f4b71Sopenharmony_ci        import { BusinessError } from '@kit.BasicServicesKit';
242e41f4b71Sopenharmony_ci
243e41f4b71Sopenharmony_ci        let context = getContext(this) as common.UIAbilityContext; // UIAbilityContext
244e41f4b71Sopenharmony_ci        let want: Want = {
245e41f4b71Sopenharmony_ci          bundleName: 'com.example.myapplication',
246e41f4b71Sopenharmony_ci          abilityName: 'FuncAbility',
247e41f4b71Sopenharmony_ci          parameters: {
248e41f4b71Sopenharmony_ci            [wantConstant.Params.CONTENT_TITLE_KEY]: 'contentTitle',
249e41f4b71Sopenharmony_ci          },
250e41f4b71Sopenharmony_ci        };
251e41f4b71Sopenharmony_ci
252e41f4b71Sopenharmony_ci        context.startAbility(want, (err: BusinessError) => {
253e41f4b71Sopenharmony_ci          if (err.code) {
254e41f4b71Sopenharmony_ci            console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`);
255e41f4b71Sopenharmony_ci          }
256e41f4b71Sopenharmony_ci        });
257e41f4b71Sopenharmony_ci        ```
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