Shallow Size：对象自身占用内存的大小，不包括它引用的对象。JavaScript 对象会将一些内存用于自身的说明和保存中间值。通常，只有数组和字符串会有明显的浅层大小。 Retained Size：这是将对象本身连同其无法从 GC root 到达的相关对象一起删除后释放的内存大小。

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