# wx.onShow(function callback)
Listens on the event that the Mini Game is switched to the foreground.
# Parameters
# function callback
The callback function for the event that the Mini Game is switched to the foreground.
# Parameters
# Object res
| Property | Type | Description |
|---|---|---|
| scene | string | Scene value |
| query | Object | Query parameter |
| shareTicket | string | shareTicket |
| referrerInfo | object | This field is returned when the Mini Game is opened from another Mini Program, Official Account, or app. |
referrerInfo is composed as follows
| Property | Type | Description |
|---|---|---|
| appId | string | The appId of the source Mini Program, Official Account, or app. |
| extraData | object | The data transfered from the source Mini Program, supported when scene=1037 or 1038. |