Shadow DOM is a web component feature that lets you attach an isolated DOM subtree to any HTML element, hidden from the main document’s standard queries. A querySelector('audio') on the main document cannot see inside a Shadow Root unless you specifically traverse into it. If fermaw’s player was mounted inside a Shadow Root, basic DOM searches would come up empty.
Фото: Abdul Saboor / Reuters
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swap(&arr[low], &arr[randomIdx]); // 基准换到开头,这一点在搜狗输入法下载中也有详细论述
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