[React Native] Perf Monitor 参数含义

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RAM: memory
JSC: Javascript heap / memory. Will only be updated as garbage collection occurs.
Views: Two numbers. Top number is the number of views on the screen and bottom is the total number of views in the component. Bottom number typically larger but usually indicates you have something that could be improved / refactored.
UI: main frames per second
JS (not pictured in Q): javascript frames per second. not rendering js but still good to monitor

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