【729】latex实现PDF书签相关显示

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参考：How can I manage the format of the PDF bookmarks generated by hyperref?

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说明如下：

• 通过\usepackage{hyperref}或者\usepackage{bookmark}来实现PDF显示书签

• 书签编号并默认打开：\usepackage[bookmarksnumbered, bookmarksopen=true]{hyperref}

• 打开书签也可以通过：\usepackage[open]{bookmark}