- Release Notes and Announcements
- Product Introduction
- Purchasing Guide
- Getting Started
- Introduction to Platform Functions
- Guidelines for Code Integration
- Get Demo and SDK
- Android
- iOS
- Flutter
- Guildlines for Mini Program Development
- Mini Program Introduction and Development Environment
- Mini Program Code Composition
- Guidance
- Framework
- Components
- API
- API Overview
- Fundamentals
- Routing
- Redirect
- Forwarding
- Interface
- Network
- Data Caching
- Data Analysis
- Canvas
- Worker
- Media
- WXML
- File
- Device
- Contact
- Vibration
- Battery Level
- Screen
- Memory
- Device Orientation
- Accessibility
- Network
- Keyboard
- Phone Number
- Accelerometer
- Compass
- Gyroscope
- SMS
- Code Scanning
- Encryption
- NFC－Ndef
- NFC－NfcA
- NFC－NfcB
- NFC－NfcF
- NFC－NfcV
- WiFi
- Calendar
- Clipboard
- NFC－getNFCAdapter
- NFC－NFCAdapter
- NFC－IsoDep
- NFC－MifareClassic
- NFC－MifareUltralight
- Bluetooth - Low Energy Central Device
- Bluetooth - Low Energy Peripheral Device
- Bluetooth - Beacon
- Bluetooth - General
- Location
- Open APIs
- Custom APIs
- Sensitive APIs
- H5 Real-Time Communication
- JS SDK
- Base Library
- IDE Operation Instructions
- FAQs
- API Documentation
- Application APIs
- Management-Sensitive APIs
- Platform Management APIs
- Mini Program APIs
- DescribeMNPOfflinePackageURL
- CreateMNPDomainACL
- CreateMNP
- ReleaseMNPVersion
- CreateMNPApproval
- DescribeMNPAllStageVersions
- DeleteMNP
- DescribeMNP
- DescribeMNPList
- DescribeMNPCategory
- DescribeMNPPreview
- ModifyMNP
- ConfigureMNPPreview
- ProcessMNPApproval
- CreateMNPVersion
- DescribeMNPVersion
- DescribeMNPReleasedVersionHistory
- RemoveMNP
- RollbackMNPVersion
- Team Management APIs
- Global Domain Management APIs
- User Management APIs
- Role Management APIs
- Sensitive API-related APIs
- Agreements
- Release Notes and Announcements
- Product Introduction
- Purchasing Guide
- Getting Started
- Introduction to Platform Functions
- Guidelines for Code Integration
- Get Demo and SDK
- Android
- iOS
- Flutter
- Guildlines for Mini Program Development
- Mini Program Introduction and Development Environment
- Mini Program Code Composition
- Guidance
- Framework
- Components
- API
- API Overview
- Fundamentals
- Routing
- Redirect
- Forwarding
- Interface
- Network
- Data Caching
- Data Analysis
- Canvas
- Worker
- Media
- WXML
- File
- Device
- Contact
- Vibration
- Battery Level
- Screen
- Memory
- Device Orientation
- Accessibility
- Network
- Keyboard
- Phone Number
- Accelerometer
- Compass
- Gyroscope
- SMS
- Code Scanning
- Encryption
- NFC－Ndef
- NFC－NfcA
- NFC－NfcB
- NFC－NfcF
- NFC－NfcV
- WiFi
- Calendar
- Clipboard
- NFC－getNFCAdapter
- NFC－NFCAdapter
- NFC－IsoDep
- NFC－MifareClassic
- NFC－MifareUltralight
- Bluetooth - Low Energy Central Device
- Bluetooth - Low Energy Peripheral Device
- Bluetooth - Beacon
- Bluetooth - General
- Location
- Open APIs
- Custom APIs
- Sensitive APIs
- H5 Real-Time Communication
- JS SDK
- Base Library
- IDE Operation Instructions
- FAQs
- API Documentation
- Application APIs
- Management-Sensitive APIs
- Platform Management APIs
- Mini Program APIs
- DescribeMNPOfflinePackageURL
- CreateMNPDomainACL
- CreateMNP
- ReleaseMNPVersion
- CreateMNPApproval
- DescribeMNPAllStageVersions
- DeleteMNP
- DescribeMNP
- DescribeMNPList
- DescribeMNPCategory
- DescribeMNPPreview
- ModifyMNP
- ConfigureMNPPreview
- ProcessMNPApproval
- CreateMNPVersion
- DescribeMNPVersion
- DescribeMNPReleasedVersionHistory
- RemoveMNP
- RollbackMNPVersion
- Team Management APIs
- Global Domain Management APIs
- User Management APIs
- Role Management APIs
- Sensitive API-related APIs
- Agreements
onMemoryWarning
This API is used via wx.onMemoryWarning(function listener).
Feature Description: Monitors low memory warning events. When iOS/Android issues a memory warning to the mini program process, these events are triggered. The triggering of such events does not imply that the mini program process has been cleared. In most cases, it is merely a warning. Developers can recycle some unnecessary resources to avoid further exacerbating memory tension after receiving the notification.
Parameter and Description: function listener, the monitoring function for low memory warning events.
Attribute | Type | Description |
level | number | Memory warning level, only available on Android, corresponds to system macro definition. |
Valid Values for Level
Valid Values | 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
This API is used via wx.offMemoryWarning(function listener).
Feature Description: Removes the listener function for low memory warning events.
Parameters and Description: function listener, the listener function passed in by onMemoryWarning. If this parameter is not passed in, all listener functions will be removed.
Sample Code
const listener = function (res) { console.log(res) }wx.onMemoryWarning(listener)wx.offMemoryWarning(listener) // The same function object as the listener must be passed in.
Yes
No
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