closeApp
The closeApp API is called by the super app to close mini programs with appId, the unique ID  to identify a mini program.
Method signature
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closeApp(appId:String?)Parameters
| Name | Type | Description | Required | 
| appId | String | Yes | The unique ID that is assigned by Mini Program Platform to identify a mini program. Note: If the appId is empty or  | 
Samples
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Griver.closeApp(appId)