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.
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，详情可参考雷电模拟器官方版本下载
这类并购之所以相对成功，在于潍柴背后有完整的发动机与动力系统产业链支撑，而不是单纯的财务投资冲动。
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