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const realIdx = i % len; // 取模映射到真实数组索引，模拟循环

drop-newest: Discards incoming data when full. Useful when you want to process what you have without being overwhelmed.

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有前款第三项行为的，予以取缔。被取缔一年以内又实施的，处十日以上十五日以下拘留，并处三千元以上五千元以下罚款。