返回缓存中当前未使用的字节数。
当缓存为空时，该值等于 Cache.maximumAvailableStorageSpace。当 AssetBundle 存入缓存后，该值将减少。缓存系统基于最近最少使用 (LRU) 算法管理缓存的内容。如果缓存中没有足够的空间来存储请求的 AssetBundle，则将迭代删除缓存中最旧的 AssetBundle，直到有足够的空间存放新 AssetBundle。 该属性不考虑总可用存储空间。如果用户计算机上缓存所在驱动器的可用磁盘空间少于 spaceFree，将无法使用 spaceFree 的所有容量。
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