Implicit Trust Upgrade: Google retroactively applied sensitive privileges to existing keys that were already rightfully deployed in public environments (e.g., JavaScript bundles).
└───────────────────────┘，这一点在safew官方版本下载中也有详细论述
，推荐阅读heLLoword翻译官方下载获取更多信息
The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.，推荐阅读Line官方版本下载获取更多信息
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this.arr = []; // 存储所有历史价格，通过索引快速获取对应价格