303 lines
6.5 KiB
Vue
303 lines
6.5 KiB
Vue
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<template>
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<div class="data-ui-gap-demo">
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<div class="two-panels">
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<div class="panel data-panel">
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<div class="panel-header">
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<span class="panel-badge data">数据（JavaScript 变量）</span>
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</div>
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<div class="data-display">
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<div class="data-row">
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<span class="data-key">商品数量</span>
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<span class="data-val">{{ dataCount }}</span>
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</div>
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<div class="data-row">
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<span class="data-key">总价</span>
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<span class="data-val">¥{{ dataCount * 99 }}</span>
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</div>
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<div class="data-row">
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<span class="data-key">状态</span>
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<span class="data-val">{{ dataCount > 5 ? '过多' : '正常' }}</span>
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</div>
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</div>
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<button class="action-btn" @click="addItem">添加商品（修改数据）</button>
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</div>
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<div class="gap-indicator" :class="{ desynced: isDesynced }">
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<div class="gap-line" />
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<span class="gap-label">{{ isDesynced ? '❌ 不同步' : '✅ 同步' }}</span>
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<div class="gap-line" />
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</div>
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<div class="panel ui-panel">
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<div class="panel-header">
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<span class="panel-badge ui">界面（用户看到的）</span>
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</div>
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<div class="ui-display">
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<div class="ui-row" :class="{ stale: uiCount !== dataCount }">
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<span class="ui-key">购物车</span>
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<span class="ui-val">{{ uiCount }} 件</span>
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</div>
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<div class="ui-row" :class="{ stale: uiCount !== dataCount }">
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<span class="ui-key">总价</span>
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<span class="ui-val">¥{{ uiCount * 99 }}</span>
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</div>
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<div class="ui-row" :class="{ stale: uiCount !== dataCount }">
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<span class="ui-key">状态</span>
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<span class="ui-val">{{ uiCount > 5 ? '过多' : '正常' }}</span>
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</div>
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</div>
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<button class="sync-btn" :disabled="!isDesynced" @click="syncUI">
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{{ isDesynced ? '手动同步界面' : '已同步' }}
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</button>
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</div>
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</div>
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<div class="controls-row">
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<button class="action-btn outline" @click="reset">重置</button>
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<span v-if="desyncCount > 0" class="desync-stat">
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累计不同步 {{ desyncCount }} 次
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</span>
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</div>
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<div class="info-box">
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<strong>核心问题：</strong>
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<span>在没有框架的情况下，数据变了，界面不会自动跟着变。你必须自己写代码去更新界面，一旦忘了，用户看到的就是过时的、错误的信息。</span>
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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, computed } from 'vue'
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const dataCount = ref(0)
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const uiCount = ref(0)
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const desyncCount = ref(0)
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const isDesynced = computed(() => dataCount.value !== uiCount.value)
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function addItem() {
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dataCount.value++
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if (dataCount.value > 1 && isDesynced.value) {
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desyncCount.value++
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}
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}
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function syncUI() {
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uiCount.value = dataCount.value
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}
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function reset() {
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dataCount.value = 0
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uiCount.value = 0
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desyncCount.value = 0
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}
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</script>
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<style scoped>
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.data-ui-gap-demo {
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border: 1px solid var(--vp-c-divider);
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border-radius: 6px;
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background-color: var(--vp-c-bg-soft);
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padding: 0.75rem;
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margin: 0.5rem 0;
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}
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.two-panels {
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display: grid;
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grid-template-columns: 1fr auto 1fr;
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gap: 0.75rem;
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align-items: start;
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margin-bottom: 0.75rem;
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}
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.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: 6px;
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padding: 0.75rem;
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}
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.panel-header {
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text-align: center;
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margin-bottom: 0.75rem;
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}
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.panel-badge {
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display: inline-block;
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padding: 0.2rem 0.6rem;
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border-radius: 9999px;
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font-size: 0.72rem;
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font-weight: 600;
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}
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.panel-badge.data {
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background: rgba(59, 130, 246, 0.1);
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color: var(--vp-c-brand);
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}
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.panel-badge.ui {
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background: rgba(16, 185, 129, 0.1);
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color: var(--vp-c-green-1);
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}
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.data-display,
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.ui-display {
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display: flex;
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flex-direction: column;
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gap: 0.4rem;
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margin-bottom: 0.75rem;
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}
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.data-row,
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.ui-row {
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display: flex;
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justify-content: space-between;
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align-items: center;
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padding: 0.35rem 0.5rem;
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background: var(--vp-c-bg-alt);
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border-radius: 4px;
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font-size: 0.82rem;
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border: 1px solid transparent;
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transition: all 0.3s;
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}
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.ui-row.stale {
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border-color: var(--vp-c-danger-1);
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background: rgba(239, 68, 68, 0.06);
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}
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.data-key,
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.ui-key {
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color: var(--vp-c-text-2);
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}
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.data-val,
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.ui-val {
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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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.gap-indicator {
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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gap: 0.35rem;
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padding-top: 2.5rem;
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}
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.gap-line {
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width: 2px;
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height: 2rem;
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background: var(--vp-c-green-1);
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transition: background 0.3s;
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}
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.gap-indicator.desynced .gap-line {
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background: var(--vp-c-danger-1);
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animation: pulse-line 1s infinite;
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}
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@keyframes pulse-line {
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0%, 100% { opacity: 0.4; }
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50% { opacity: 1; }
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}
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.gap-label {
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font-size: 0.72rem;
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font-weight: 600;
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white-space: nowrap;
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}
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.action-btn {
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display: block;
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width: 100%;
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padding: 0.35rem 0.75rem;
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background: var(--vp-c-brand);
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color: white;
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border: none;
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border-radius: 4px;
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cursor: pointer;
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font-size: 0.82rem;
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transition: opacity 0.2s;
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}
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.action-btn:hover { opacity: 0.85; }
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.action-btn.outline {
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background: transparent;
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border: 1px solid var(--vp-c-divider);
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color: var(--vp-c-text-1);
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}
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.action-btn.outline:hover {
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border-color: var(--vp-c-brand);
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color: var(--vp-c-brand);
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}
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.sync-btn {
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display: block;
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width: 100%;
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padding: 0.35rem 0.75rem;
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background: var(--vp-c-green-1);
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color: white;
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border: none;
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border-radius: 4px;
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cursor: pointer;
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font-size: 0.82rem;
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transition: opacity 0.2s;
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}
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.sync-btn:disabled {
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opacity: 0.5;
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cursor: not-allowed;
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}
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.controls-row {
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display: flex;
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align-items: center;
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gap: 0.75rem;
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margin-bottom: 0.75rem;
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}
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.controls-row .action-btn {
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width: auto;
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}
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.desync-stat {
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font-size: 0.8rem;
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color: var(--vp-c-danger-1);
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font-weight: 600;
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}
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.info-box {
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background: var(--vp-c-bg-alt);
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padding: 0.75rem;
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border-radius: 6px;
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font-size: 0.85rem;
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color: var(--vp-c-text-2);
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display: flex;
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gap: 0.25rem;
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}
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.info-box strong {
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white-space: nowrap;
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flex-shrink: 0;
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color: var(--vp-c-text-1);
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}
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@media (max-width: 720px) {
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.two-panels {
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grid-template-columns: 1fr;
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}
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.gap-indicator {
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flex-direction: row;
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padding-top: 0;
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}
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.gap-line {
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width: 2rem;
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height: 2px;
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}
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}
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</style>
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