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// Hash computation is fast，这一点在im钱包官方下载中也有详细论述
this.arr = []; // 存储所有历史价格，通过索引快速获取对应价格。关于这个话题，快连下载安装提供了深入分析
Given all that complexity, along with the fact that I’m using a high-level dynamic programming language, I wasn’t surprised when my initial benchmarks showed the server responding in 200 microseconds (µs).