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.
// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错
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= $appBridge.minAppNavigationHomepageVersion? $publish('APP_NAVIGATION', { targetId: 'homepage' }) : window.location.href = $el.href"
技术栈：HTML5 + Tailwind CSS（或其他轻量级 CSS 方案）。"