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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2014年，罗伯·莱纳与妻子偕三名子女杰克、罗米、尼克（右三至右一）出席活动。，更多细节参见WPS下载最新地址
"It's not a cure, but because I got a good remission, that hopefully means that I'll keep the cancer at bay for a good long time."，更多细节参见WPS官方版本下载