label="Permalink to &quot;step&quot;">​</a></h3><p>当前历史的缓存数量。</p><ul><li><strong>类型</strong></li></ul><div class="language-ts vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-dark github-light vp-code"><code><span class="line"><span style="--shiki-dark:#E1E4E8;--shiki-light:#24292E;">number;</span></span></code></pre></div><h2 id="方法" tabindex="-1">方法 <a class="header-anchor" href="#方法" 