ref="#相关问题" class="table-of-contents__link toc-highlight">相关问题</a></li><li><a href="#回答关键点" class="table-of-contents__link toc-highlight">回答关键点</a></li><li><a href="#知识点深入" class="table-of-contents__link toc-highlight">知识点深入</a><ul><li><a href="#1-流程图" class="table-of-contents__link toc-highlight">1. 流程图</a></li><li><a href="#2强缓存" class="table-of-contents__link toc-highlight">2.强缓存</a><ul><li><a href="#21-expires" class="table-