HarmonyOS 图片缓存策略

import app from '@system.app'  
onPageShow(): void {  
  Log.showInfo(TAG, 'onPageShow');  
  if (typeof globalThis.IsSetImageRawDataCacheSize === 'undefined') {  
  Log.showInfo(TAG, 'onPageShow setImageRawDataCacheSize');  
  // ImageRawDataCache：缓存解码前的原始数据和解码后的PixelMap  
  app.setImageRawDataCacheSize(/* size */);  
  globalThis.IsSetImageRawDataCacheSize = true;  
}  
}
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