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缓存从入门到放弃
source link: https://juejin.im/post/5bfe879a51882531b81b0891
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什么是缓存? 缓存的定义 缓存就是数据交换的缓冲区（称作Cache），这个概念最初是来自于内存和CPU。当某一硬件要读取数据时，会首先从缓存中查找需要的数据，如果找到了则直接执行，找不到的话则从内存中找。由于缓存的运行速度比内存快得多，故缓存的作用就是帮助硬件
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