https://June6699.github.io/tags/%E6%8A%80%E6%9C%AF/%E5%89%8D%E7%AB%AF/javascript/Recent content in 技术/前端/JavaScript on June's BlogHugozh-cnWed, 08 Apr 2026 00:00:00 +0000https://June6699.github.io/posts/%E5%BB%96%E9%9B%AA%E5%B3%B0-javascript-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0-2--%E5%AF%B9%E8%B1%A1/Wed, 08 Apr 2026 00:00:00 +0000https://June6699.github.io/posts/%E5%BB%96%E9%9B%AA%E5%B3%B0-javascript-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0-2--%E5%AF%B9%E8%B1%A1/<h2 id="0一些链接">0、一些链接</h2> <div class="callout callout-important" data-callout="important" role="note" aria-label="重要"> <div class="callout-head"> <span class="callout-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><path d="M8 10h8"/><path d="M8 14h5"/><path d="M6 19h8a4 4 0 0 0 4-4V9a4 4 0 0 0-4-4H10a4 4 0 0 0-4 4z"/><path d="m6 19-2 2v-5"/></svg></span> <span class="callout-title">重要</span> </div> <div class="callout-body"><p>文档手册：<a href="https://www.runoob.com/jsref/jsref-tutorial.html">JavaScript 和 HTML DOM 参考手册 | 菜鸟教程</a></p> <p>廖雪峰（本笔记来源）：<a href="https://liaoxuefeng.com/books/javascript">廖雪峰 JavaScript教程</a></p>https://June6699.github.io/posts/%E5%BB%96%E9%9B%AA%E5%B3%B0-javascript-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0-1--%E5%85%A5%E9%97%A8+%E5%87%BD%E6%95%B0/Mon, 06 Apr 2026 00:00:00 +0000https://June6699.github.io/posts/%E5%BB%96%E9%9B%AA%E5%B3%B0-javascript-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0-1--%E5%85%A5%E9%97%A8+%E5%87%BD%E6%95%B0/<h2 id="0一些链接">0、一些链接</h2> <div class="callout callout-important" data-callout="important" role="note" aria-label="重要"> <div class="callout-head"> <span class="callout-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><path d="M8 10h8"/><path d="M8 14h5"/><path d="M6 19h8a4 4 0 0 0 4-4V9a4 4 0 0 0-4-4H10a4 4 0 0 0-4 4z"/><path d="m6 19-2 2v-5"/></svg></span> <span class="callout-title">重要</span> </div> <div class="callout-body"><p>文档手册：<a href="https://www.runoob.com/jsref/jsref-tutorial.html">JavaScript 和 HTML DOM 参考手册 | 菜鸟教程</a></p> <p>廖雪峰（本笔记来源）：<a href="https://liaoxuefeng.com/books/javascript">廖雪峰 JavaScript教程</a></p>https://June6699.github.io/posts/%E5%BB%96%E9%9B%AA%E5%B3%B0-javascript-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0-0.1--%E6%95%B0%E5%AD%97%E7%B2%BE%E5%BA%A6/Sun, 15 Mar 2026 00:00:00 +0000https://June6699.github.io/posts/%E5%BB%96%E9%9B%AA%E5%B3%B0-javascript-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0-0.1--%E6%95%B0%E5%AD%97%E7%B2%BE%E5%BA%A6/<h2 id="1-为什么整数安全范围是-2而不是-2">1. 为什么整数安全范围是 ±2⁵³，而不是 ±2⁶³？</h2> <p>因为 JavaScript 里的 <code>Number</code> <strong>不是整数类型</strong>，而是 <strong>64 位双精度浮点数</strong>（IEEE 754 double）。</p> <p>这两种&quot;64 位&quot;的本质区别是：</p>