The true flag for useCapture is important. Browser events propagate in two phases: first, they travel down the DOM tree from the root to the target (capture phase), then they bubble up from the target back to the root (bubble phase). By listening in the capture phase, my listener fires before any event listener attached by HotAudio’s player code. Even if fermaw tried to cancel or suppress the event, he’d be too late because the capturing listener always fires first.
（一）包含两个以上涉及不同税率、征收率的业务；
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res[i] = stack.length ? stack.at(-1) : -1;