310 lines
8.0 KiB
Vue
310 lines
8.0 KiB
Vue
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<template>
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<div class="demo-wrapper">
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<div class="demo-header">
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<span class="icon">🔍</span>
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<span>无障碍对象模型 (AOM) 视角对比演示</span>
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</div>
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<div class="intro-text">
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请尝试使用<strong>纯键盘（Tab 键与 Enter 键）</strong>分别操作下方两个面板中的元素，并观察右侧“屏幕阅读器”捕获到的 AOM 层解析结果。
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</div>
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<div class="comparison-container">
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<!-- 案例 A：仅仅是看起来像按钮 -->
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<div class="case-panel bad-case">
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<h3 class="case-title">❌ 案例 A：纯粹的视觉欺骗</h3>
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<p class="case-desc">使用 <code><div></code> 结合 CSS 绘制。在渲染树上很完美，但在 AOM 树中缺失语义。</p>
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<div class="interactive-area">
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<div class="label">操作确认：</div>
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<!-- 伪造的 input -->
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<div
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class="fake-input"
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@click="simulateFocus('bad', '文本：请输入验证码')"
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>
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请输入验证码
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</div>
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<!-- 伪造的 button -->
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<div
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class="fake-button"
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@mouseenter="simulateFocus('bad', '文本：确认提交')"
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@mouseleave="clearFocus('bad')"
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@click="handleClick('bad')"
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>
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确认提交
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</div>
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</div>
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<div class="aom-monitor">
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<div class="monitor-header">💻 屏幕阅读器解析 (AOM)：</div>
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<div class="monitor-screen" :class="{ 'has-content': badCaseOutput }">
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{{ badCaseOutput || '（视障用户无法通过 Tab 键选中此区域的任何元素）' }}
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</div>
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</div>
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</div>
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<!-- 案例 B：语义化与 ARIA 规范 -->
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<div class="case-panel good-case">
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<h3 class="case-title">✅ 案例 B：语义化 + ARIA 护航</h3>
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<p class="case-desc">使用 <code><input></code>、<code><button></code> 等原生标签，补充 <code>aria-label</code>。在 AOM 树中拥有完整交互属性。</p>
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<div class="interactive-area">
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<label for="a11y-input" class="label">操作确认：</label>
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<input
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id="a11y-input"
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type="text"
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placeholder="请输入验证码"
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@focus="simulateFocus('good', '输入框：操作确认，请输入验证码')"
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@blur="clearFocus('good')"
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@mouseenter="simulateFocus('good', '输入框：操作确认，请输入验证码')"
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@mouseleave="clearFocus('good')"
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/>
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<button
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type="button"
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class="real-button"
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aria-label="提交确认验证码"
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@focus="simulateFocus('good', '按钮：提交确认验证码。按下回车键激活。')"
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@blur="clearFocus('good')"
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@mouseenter="simulateFocus('good', '按钮：提交确认验证码。')"
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@mouseleave="clearFocus('good')"
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@click="handleClick('good')"
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>
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确认提交
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</button>
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</div>
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<div class="aom-monitor">
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<div class="monitor-header">💻 屏幕阅读器解析 (AOM)：</div>
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<div class="monitor-screen" :class="{ 'has-content': goodCaseOutput }">
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{{ goodCaseOutput || '（鼠标悬停或按 Tab 键切入以查看解析）' }}
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</div>
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</div>
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</div>
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</div>
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</div>
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</template>
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<script setup>
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import { ref } from 'vue'
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const badCaseOutput = ref('')
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const goodCaseOutput = ref('')
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let timerBad = null
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let timerGood = null
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const simulateFocus = (type, text) => {
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if (type === 'bad') {
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if (timerBad) clearTimeout(timerBad)
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badCaseOutput.value = text
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} else {
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if (timerGood) clearTimeout(timerGood)
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goodCaseOutput.value = '🗣️ 正在朗读：' + text
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}
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}
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const clearFocus = (type) => {
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if (type === 'bad') {
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timerBad = setTimeout(() => { badCaseOutput.value = '' }, 400)
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} else {
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timerGood = setTimeout(() => { goodCaseOutput.value = '' }, 400)
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}
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}
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const handleClick = (type) => {
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if (type === 'bad') {
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alert('【系统提示】普通 div 虽然能绑定点击事件，但键盘用户无法使用 Tab 聚焦它，也无法用 Enter 键触发它。这对肢体障碍人士是灾难。')
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} else {
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alert('【系统提示】原生 button 点击触发成功！无论你是用鼠标点击，还是用键盘 Enter 键，都能完美触发。')
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}
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}
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</script>
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<style scoped>
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.demo-wrapper {
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background: var(--vp-c-bg-soft);
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border: 1px solid var(--vp-c-divider);
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border-radius: 10px;
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padding: 1.8rem;
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margin: 2rem 0;
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font-family: var(--vp-font-family-base);
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}
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.demo-header {
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display: flex;
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align-items: center;
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gap: 0.8rem;
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font-size: 1.25rem;
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font-weight: 700;
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color: var(--vp-c-text-1);
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margin-bottom: 1rem;
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border-bottom: 2px solid var(--vp-c-divider);
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padding-bottom: 0.8rem;
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}
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.intro-text {
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font-size: 0.95rem;
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color: var(--vp-c-text-2);
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margin-bottom: 1.8rem;
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line-height: 1.6;
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}
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.comparison-container {
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display: flex;
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flex-direction: column;
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gap: 1.5rem;
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}
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@media (min-width: 768px) {
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.comparison-container {
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flex-direction: row;
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}
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.case-panel {
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flex: 1;
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min-width: 0;
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}
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}
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.case-panel {
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background: var(--vp-c-bg);
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border: 1px solid var(--vp-c-divider);
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border-radius: 8px;
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padding: 1.5rem;
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display: flex;
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flex-direction: column;
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}
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.bad-case {
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border-top: 4px solid var(--vp-c-danger-1);
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}
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.good-case {
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border-top: 4px solid var(--vp-c-brand-1);
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}
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.case-title {
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margin: 0 0 0.8rem 0;
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font-size: 1.1rem;
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font-weight: 700;
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color: var(--vp-c-text-1);
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}
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.case-desc {
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font-size: 0.85rem;
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color: var(--vp-c-text-2);
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margin-bottom: 1.5rem;
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line-height: 1.5;
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min-height: 2.5rem;
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}
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.case-desc code {
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background: var(--vp-c-bg-alt);
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padding: 0.1rem 0.3rem;
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border-radius: 4px;
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color: var(--vp-c-text-1);
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}
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.interactive-area {
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display: flex;
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flex-direction: column;
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gap: 1rem;
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margin-bottom: 2rem;
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padding: 1.5rem;
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background: var(--vp-c-bg-alt);
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border-radius: 6px;
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border: 1px dashed var(--vp-c-divider);
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}
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.label {
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font-size: 0.9rem;
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font-weight: 600;
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color: var(--vp-c-text-1);
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}
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/* 伪造元素的样式 */
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.fake-input {
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background: #fff;
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border: 1px solid #ccc;
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padding: 0.6rem 0.8rem;
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font-size: 0.9rem;
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color: #888;
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cursor: text;
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border-radius: 4px;
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}
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.fake-button {
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background: var(--vp-c-brand-soft);
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color: var(--vp-c-brand-1);
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padding: 0.6rem 1.2rem;
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text-align: center;
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font-weight: 600;
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border-radius: 4px;
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cursor: pointer;
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border: 1px solid var(--vp-c-brand-soft);
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}
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/* 注意：这里故意不写 :focus 样式，以反映一般野路子开发的现状 */
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/* 真实原生元素的样式 */
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#a11y-input {
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background: var(--vp-c-bg);
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border: 1px solid var(--vp-c-divider);
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padding: 0.6rem 0.8rem;
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font-size: 0.9rem;
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color: var(--vp-c-text-1);
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border-radius: 4px;
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transition: all 0.2s;
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}
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#a11y-input:focus {
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outline: none;
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border-color: var(--vp-c-brand-1);
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box-shadow: 0 0 0 2px var(--vp-c-brand-soft);
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}
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.real-button {
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background: var(--vp-c-brand-1);
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color: #fff;
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padding: 0.6rem 1.2rem;
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text-align: center;
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font-weight: 600;
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border-radius: 4px;
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border: none;
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cursor: pointer;
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transition: all 0.2s;
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}
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.real-button:hover {
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background: var(--vp-c-brand-2);
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}
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.real-button:focus-visible {
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outline: none;
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box-shadow: 0 0 0 3px var(--vp-c-brand-soft);
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}
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/* 屏幕阅读器模拟面板 */
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.aom-monitor {
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margin-top: auto;
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background: #1e293b;
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border-radius: 6px;
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padding: 1rem;
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border-left: 4px solid #475569;
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}
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.monitor-header {
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font-size: 0.8rem;
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color: #94a3b8;
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margin-bottom: 0.6rem;
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font-weight: 600;
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}
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.monitor-screen {
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font-family: "Courier New", Courier, monospace;
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font-size: 0.9rem;
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color: #64748b;
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min-height: 2.5rem;
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line-height: 1.4;
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}
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.monitor-screen.has-content {
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color: #34d399; /* 绿色亮起，表示正确读出语义 */
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font-weight: bold;
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}
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.dark .fake-input { background: #333; border-color: #555; }
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</style>
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