wx.onMemoryWarning(function callback)官网的说明是：当 iOS/Android 向小程序进程发出内存警告时，触发该事件。触发该事件不意味小程序被杀，大部分情况下仅仅是告警，开发者可在收到通知后回收一些不必要资源避免进一步加剧内存紧张。
对开发者来说，怎么回收一些不必要的资源呢？有API吗？
相关问题
相关文档
- wx.onMemoryWarning: 小程序/开发/API/设备/内存/wx.onMemoryWarning
- Function explaination: Mini Program/Development/Capabilities/Commercial capabilities/Mini Program alliance/Push client/Function explaination
- Function explaination: Mini Program/Development/Capabilities/Commercial capabilities/Mini Program alliance/Merchant end/Function explaination
- Callback Back Sample: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Event callback access process: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/Event callback access process
回收一些不必要资源的方法：
迫切希望官方提供内存告警时能清除缓存API