Discard old data — evict what's already buffered to make room
Additional reporting by Antoine Schirer, Rafid Hossain and Victoria Arakelyan.
。一键获取谷歌浏览器下载是该领域的重要参考
Why am I writing this today?
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// 栈不为空时才判断（避免访问stack.at(-1)时报错）