Memory

onMemoryWarning

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The API usage is as follows: wx.onMemoryWarning(function listener)

• Functional description: Listen for low memory warning events. This event is triggered when iOS/Android issues a memory warning to the Mini Program process. Triggering this event does not mean that the Mini Program process is cleared. In most cases, it is just a warning. Developers can recycle some unnecessary resources after receiving the notification to avoid further aggravating memory shortages.

• Parameters and descriptions: function listener，Listener function for low memory warning event

  Properties	Type	Description
  level	number	Memory warning level, only available on Android, corresponding to system macro definition

• level legal value

  Legal value	Description
  5	TRIM_MEMORY_RUNNING_MODERATE
  10	TRIM_MEMORY_RUNNING_LOW
  15	TRIM_MEMORY_RUNNING_CRITICAL

• Sample code:

wx.onMemoryWarning(function () {
  console.log('onMemoryWarningReceive')
})

offMemoryWarning

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The API usage is as follows: wx.offMemoryWarning(function listener)

• Functional description: Remove the listener function for low memory warning events

• Parameters and descriptions: function listener，Listener function passed in by onMemoryWarning. If this parameter is not passed, all listeners will be removed

• Sample code:

const listener = function (res) { console.log(res) }

wx.onMemoryWarning(listener)
wx.offMemoryWarning(listener) // Pass the same function object used for listening.