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<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>05 Array｜JavaScript Development Lab</title>
  <link rel="stylesheet" href="css/style.css">
</head>
<body>
  <main class="container">
    <header class="hero">
      <p class="eyebrow">JavaScript Development Lab · 05</p>
      <h1>数组：管理一组有顺序的数据</h1>
      <p class="lead">通过一个最小产品集合，观察 JavaScript 如何创建数组、通过索引读取和修改数据，以及使用 <code>push()</code>、<code>pop()</code>、<code>shift()</code>、<code>unshift()</code> 改变数组。</p>
    </header>

    <section class="panel">
      <div class="section-head">
        <div>
          <span class="step">实验 A</span>
          <h2>创建数组与读取元素</h2>
        </div>
        <code>products[0]</code>
      </div>
      <div class="result-grid">
        <div class="result-item"><span>第 1 个产品</span><strong id="first-product">-</strong></div>
        <div class="result-item"><span>第 2 个产品</span><strong id="second-product">-</strong></div>
        <div class="result-item primary"><span>数组长度</span><strong id="product-count">-</strong></div>
      </div>
    </section>

    <section class="panel">
      <div class="section-head">
        <div>
          <span class="step">实验 B</span>
          <h2>修改指定位置的数据</h2>
        </div>
        <code>products[1] = 'Cladding'</code>
      </div>
      <div class="compare-grid">
        <div class="compare-item">
          <span>修改前</span>
          <strong id="before-update">-</strong>
        </div>
        <div class="arrow">→</div>
        <div class="compare-item primary">
          <span>修改后</span>
          <strong id="after-update">-</strong>
        </div>
      </div>
    </section>

    <section class="panel">
      <div class="section-head">
        <div>
          <span class="step">实验 C</span>
          <h2>向数组两端添加和删除数据</h2>
        </div>
        <code>push / pop / unshift / shift</code>
      </div>
      <div class="action-list" id="array-actions"></div>
    </section>

    <section class="panel">
      <div class="section-head">
        <div>
          <span class="step">实验 D</span>
          <h2>查看最终数组</h2>
        </div>
        <code>products</code>
      </div>
      <div class="product-list" id="product-list"></div>
    </section>

    <section class="panel note">
      <h2>本章观察重点</h2>
      <ol>
        <li>数组适合保存一组有顺序的数据。</li>
        <li>数组索引从 <code>0</code> 开始，而不是从 <code>1</code> 开始。</li>
        <li><code>length</code> 表示数组当前包含多少个元素。</li>
        <li>通过索引可以读取或修改指定位置的数据。</li>
        <li><code>push()</code> / <code>pop()</code> 操作数组尾部，<code>unshift()</code> / <code>shift()</code> 操作数组头部。</li>
      </ol>
    </section>
  </main>

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