itemprop="name">前言</span><meta itemprop="position" content="1"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>前言</h1><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="写作背景">写作背景<a href="#写作背景" class="hash-link" aria-label="Direct link to 写作背景" title="Direct link to 写作背景">​</a></