477 lines
14 KiB
Vue
477 lines
14 KiB
Vue
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<template>
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<div class="why-no-auto-sync-demo">
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<div class="demo-header">
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<span class="title">变量修改时发生了什么？</span>
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<span class="subtitle">原生 JavaScript vs 框架</span>
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</div>
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<div class="toggle-bar">
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<button
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:class="['toggle-btn', { active: mode === 'native' }]"
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@click="switchMode('native')"
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>
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原生 JavaScript
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</button>
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<button
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:class="['toggle-btn', { active: mode === 'framework' }]"
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@click="switchMode('framework')"
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>
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使用框架（Vue）
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</button>
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</div>
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<div class="visualization-area">
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<div class="code-col">
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<div class="col-title">你写的代码</div>
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<div class="code-block">
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<div class="code-line">
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<span class="code-comment">// 点击按钮时执行</span>
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</div>
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<div :class="['code-line', 'code-highlight', { executing: step >= 1 }]">
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<span class="code-text">count = count + 1</span>
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<span v-if="step >= 1" class="step-badge">{{ step >= 1 ? '✓ 执行' : '' }}</span>
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</div>
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<template v-if="mode === 'native'">
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<div class="code-line code-gap" />
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<div class="code-line">
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<span class="code-comment">// 你还要手动写下面这些：</span>
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</div>
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<div :class="['code-line', 'code-manual', { executing: step >= 2, missing: step === 1 }]">
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<span class="code-text">document.getElementById('count')</span>
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</div>
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<div :class="['code-line', 'code-manual', { executing: step >= 2, missing: step === 1 }]">
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<span class="code-text"> .textContent = count</span>
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<span v-if="step >= 2" class="step-badge">✓ 手动</span>
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<span v-else-if="step === 1" class="step-badge miss">需要你写</span>
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</div>
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<div :class="['code-line', 'code-manual', { executing: step >= 3, missing: step < 3 && step >= 1 }]">
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<span class="code-text">document.getElementById('total')</span>
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</div>
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<div :class="['code-line', 'code-manual', { executing: step >= 3, missing: step < 3 && step >= 1 }]">
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<span class="code-text"> .textContent = count * 99</span>
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<span v-if="step >= 3" class="step-badge">✓ 手动</span>
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<span v-else-if="step >= 1" class="step-badge miss">需要你写</span>
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</div>
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</template>
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<template v-else>
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<div class="code-line code-gap" />
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<div class="code-line">
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<span class="code-comment">// 不需要写别的了</span>
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</div>
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<div class="code-line">
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<span class="code-comment">// 框架会自动完成后续步骤</span>
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</div>
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</template>
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</div>
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</div>
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<div class="flow-col">
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<div class="col-title">执行流程</div>
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<div class="flow-steps">
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<div :class="['flow-step', { active: step >= 1, done: step > 1 }]">
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<span class="flow-num">1</span>
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<div class="flow-content">
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<div class="flow-title">JavaScript 修改变量</div>
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<div class="flow-desc">count 从 {{ count - 1 }} 变成 {{ count }}</div>
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</div>
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</div>
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<div class="flow-arrow" :class="{ active: step >= 1 }">
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<span v-if="mode === 'native'">{{ step === 1 ? '❌ 到这里就停了' : '↓' }}</span>
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<span v-else>{{ step >= 1 ? '↓ 框架自动接管' : '↓' }}</span>
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</div>
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<div :class="['flow-step', { active: step >= 2, done: step > 2, auto: mode === 'framework' }]">
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<span class="flow-num">2</span>
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<div class="flow-content">
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<div class="flow-title">
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{{ mode === 'native' ? '找到 DOM 节点' : '框架检测到变化' }}
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</div>
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<div class="flow-desc">
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{{ mode === 'native'
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? '手动调用 document.getElementById()'
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: 'Proxy 拦截了赋值操作，通知更新系统' }}
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</div>
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</div>
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<span v-if="mode === 'framework' && step >= 2" class="auto-badge">自动</span>
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</div>
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<div class="flow-arrow" :class="{ active: step >= 2 }">↓</div>
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<div :class="['flow-step', { active: step >= 3, done: step > 3, auto: mode === 'framework' }]">
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<span class="flow-num">3</span>
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<div class="flow-content">
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<div class="flow-title">
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{{ mode === 'native' ? '修改 DOM 内容' : '框架更新所有相关 DOM' }}
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</div>
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<div class="flow-desc">
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{{ mode === 'native'
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? '手动调用 .textContent = 新值'
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: '自动找到所有使用了 count 的位置并更新' }}
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</div>
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</div>
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<span v-if="mode === 'framework' && step >= 3" class="auto-badge">自动</span>
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</div>
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</div>
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</div>
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<div class="result-col">
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<div class="col-title">界面结果</div>
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<div class="result-card">
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<div :class="['result-item', { updated: step >= (mode === 'native' ? 2 : 2) }]">
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<span class="result-label">购物车</span>
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<span class="result-value">{{ step >= (mode === 'native' ? 2 : 2) ? count : count - 1 }} 件</span>
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</div>
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<div :class="['result-item', { updated: step >= (mode === 'native' ? 3 : 2), stale: mode === 'native' && step >= 1 && step < 3 }]">
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<span class="result-label">总价</span>
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<span class="result-value">¥{{ step >= (mode === 'native' ? 3 : 2) ? count * 99 : (count - 1) * 99 }}</span>
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</div>
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</div>
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<div v-if="mode === 'native' && step === 1" class="stale-warning">
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变量已经改了，但界面没有任何变化
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</div>
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<div v-if="mode === 'native' && step === 2" class="stale-warning partial">
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购物车更新了，但总价还是旧的
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</div>
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</div>
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</div>
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<div class="controls">
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<button class="action-btn" :disabled="isAnimating" @click="runStep">
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{{ step === 0 ? '执行 count = count + 1' : mode === 'native' && step < 3 ? '继续手动同步下一个' : '再执行一次' }}
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</button>
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<button class="action-btn outline" @click="reset">重置</button>
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</div>
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<div class="info-box" v-if="mode === 'native'">
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<strong>为什么不自动？</strong>
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<span>JavaScript 的变量是"无感知"的。你执行 <code>count = 4</code> 时，JavaScript 引擎只是把内存中 count 的值从 3 改成 4，仅此而已。它不会通知任何人，不会触发任何回调，不会去检查页面上哪里显示了 count。所以界面不会有任何变化——除非你自己写代码去更新 DOM。</span>
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</div>
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<div class="info-box" v-else>
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<strong>框架怎么做到的？</strong>
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<span>框架把你的数据用特殊机制包裹起来。以 Vue 为例，它用 JavaScript 的 Proxy（代理）功能拦截你对变量的赋值操作。当你写 <code>count = 4</code> 时，Proxy 会在赋值的同时自动执行一段"通知"代码，告诉框架"count 变了"，框架再去找到所有用到 count 的 DOM 节点并更新它们。整个过程你不需要写任何额外代码。</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 } from 'vue'
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const mode = ref('native')
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const step = ref(0)
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const count = ref(1)
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const isAnimating = ref(false)
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function switchMode(m) {
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if (isAnimating.value) return
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mode.value = m
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reset()
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}
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function reset() {
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step.value = 0
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count.value = 1
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isAnimating.value = false
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}
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async function runStep() {
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if (isAnimating.value) return
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if (mode.value === 'native') {
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if (step.value === 0) {
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isAnimating.value = true
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count.value++
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step.value = 1
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isAnimating.value = false
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} else if (step.value === 1) {
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step.value = 2
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} else if (step.value === 2) {
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step.value = 3
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} else {
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reset()
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await new Promise(r => setTimeout(r, 100))
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runStep()
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}
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} else {
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if (step.value === 0 || step.value >= 3) {
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if (step.value >= 3) {
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reset()
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await new Promise(r => setTimeout(r, 100))
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}
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isAnimating.value = true
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count.value++
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step.value = 1
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await new Promise(r => setTimeout(r, 400))
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step.value = 2
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await new Promise(r => setTimeout(r, 400))
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step.value = 3
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isAnimating.value = false
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}
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}
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}
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</script>
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<style scoped>
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.why-no-auto-sync-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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.demo-header {
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display: flex;
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flex-wrap: wrap;
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align-items: baseline;
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gap: 0.5rem;
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margin-bottom: 0.75rem;
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}
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.demo-header .title { font-size: 1rem; font-weight: 600; }
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.demo-header .subtitle { font-size: 0.85rem; color: var(--vp-c-text-2); }
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.toggle-bar {
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display: flex;
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gap: 0.5rem;
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margin-bottom: 0.75rem;
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}
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.toggle-btn {
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padding: 0.4rem 0.8rem;
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border: 1px solid var(--vp-c-divider);
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border-radius: 6px;
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background: var(--vp-c-bg);
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cursor: pointer;
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font-size: 0.85rem;
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color: var(--vp-c-text-1);
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transition: all 0.2s;
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}
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.toggle-btn:hover { border-color: var(--vp-c-brand); }
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.toggle-btn.active { background: var(--vp-c-brand); color: white; border-color: var(--vp-c-brand); }
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.visualization-area {
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display: grid;
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grid-template-columns: 1fr 1fr 0.8fr;
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gap: 0.75rem;
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margin-bottom: 0.75rem;
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}
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.col-title {
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font-size: 0.78rem;
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font-weight: 600;
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color: var(--vp-c-text-2);
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margin-bottom: 0.5rem;
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}
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.code-col, .flow-col, .result-col {
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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: 0.6rem;
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}
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.code-block {
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font-family: var(--vp-font-family-mono);
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font-size: 0.72rem;
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line-height: 1.6;
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}
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.code-line {
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padding: 0.1rem 0.3rem;
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border-radius: 3px;
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display: flex;
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align-items: center;
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gap: 0.3rem;
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}
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.code-gap { height: 0.3rem; }
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.code-comment { color: var(--vp-c-text-3); }
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.code-text { color: var(--vp-c-text-1); }
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.code-highlight.executing {
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background: rgba(16, 185, 129, 0.1);
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border-left: 2px solid var(--vp-c-green-1);
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}
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.code-manual {
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transition: all 0.3s;
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}
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.code-manual.executing {
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background: rgba(59, 130, 246, 0.08);
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border-left: 2px solid var(--vp-c-brand);
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}
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.code-manual.missing {
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opacity: 0.5;
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border-left: 2px dashed var(--vp-c-danger-1);
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}
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.step-badge {
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font-size: 0.62rem;
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padding: 0 0.3rem;
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border-radius: 3px;
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background: var(--vp-c-green-1);
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color: white;
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flex-shrink: 0;
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margin-left: auto;
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}
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.step-badge.miss {
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background: var(--vp-c-danger-1);
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}
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.flow-steps {
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display: flex;
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flex-direction: column;
|
|||
|
|
gap: 0.2rem;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.flow-step {
|
|||
|
|
display: flex;
|
|||
|
|
align-items: flex-start;
|
|||
|
|
gap: 0.4rem;
|
|||
|
|
padding: 0.4rem 0.5rem;
|
|||
|
|
border: 1px solid var(--vp-c-divider);
|
|||
|
|
border-radius: 6px;
|
|||
|
|
background: var(--vp-c-bg-alt);
|
|||
|
|
transition: all 0.3s;
|
|||
|
|
opacity: 0.4;
|
|||
|
|
position: relative;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.flow-step.active { opacity: 1; border-color: var(--vp-c-brand); }
|
|||
|
|
.flow-step.done { opacity: 1; border-color: var(--vp-c-green-1); }
|
|||
|
|
.flow-step.auto.active { border-color: var(--vp-c-green-1); background: rgba(16, 185, 129, 0.05); }
|
|||
|
|
|
|||
|
|
.flow-num {
|
|||
|
|
width: 1.2rem;
|
|||
|
|
height: 1.2rem;
|
|||
|
|
display: flex;
|
|||
|
|
align-items: center;
|
|||
|
|
justify-content: center;
|
|||
|
|
border-radius: 50%;
|
|||
|
|
background: var(--vp-c-bg);
|
|||
|
|
border: 1px solid var(--vp-c-divider);
|
|||
|
|
font-size: 0.68rem;
|
|||
|
|
font-weight: 700;
|
|||
|
|
flex-shrink: 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.flow-step.active .flow-num { background: var(--vp-c-brand); color: white; border-color: var(--vp-c-brand); }
|
|||
|
|
.flow-step.done .flow-num { background: var(--vp-c-green-1); color: white; border-color: var(--vp-c-green-1); }
|
|||
|
|
|
|||
|
|
.flow-content { flex: 1; min-width: 0; }
|
|||
|
|
.flow-title { font-size: 0.78rem; font-weight: 600; color: var(--vp-c-text-1); }
|
|||
|
|
.flow-desc { font-size: 0.7rem; color: var(--vp-c-text-2); margin-top: 0.1rem; }
|
|||
|
|
|
|||
|
|
.auto-badge {
|
|||
|
|
position: absolute;
|
|||
|
|
top: 0.25rem;
|
|||
|
|
right: 0.35rem;
|
|||
|
|
font-size: 0.58rem;
|
|||
|
|
padding: 0 0.3rem;
|
|||
|
|
border-radius: 3px;
|
|||
|
|
background: var(--vp-c-green-1);
|
|||
|
|
color: white;
|
|||
|
|
font-weight: 600;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.flow-arrow {
|
|||
|
|
text-align: center;
|
|||
|
|
font-size: 0.75rem;
|
|||
|
|
color: var(--vp-c-text-3);
|
|||
|
|
padding: 0.1rem 0;
|
|||
|
|
transition: color 0.3s;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.flow-arrow.active { color: var(--vp-c-brand); font-weight: 600; }
|
|||
|
|
|
|||
|
|
.result-card {
|
|||
|
|
display: flex;
|
|||
|
|
flex-direction: column;
|
|||
|
|
gap: 0.4rem;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.result-item {
|
|||
|
|
display: flex;
|
|||
|
|
justify-content: space-between;
|
|||
|
|
align-items: center;
|
|||
|
|
padding: 0.4rem 0.5rem;
|
|||
|
|
background: var(--vp-c-bg-alt);
|
|||
|
|
border: 1px solid var(--vp-c-divider);
|
|||
|
|
border-radius: 4px;
|
|||
|
|
font-size: 0.82rem;
|
|||
|
|
transition: all 0.3s;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.result-item.updated { border-color: var(--vp-c-green-1); background: rgba(16, 185, 129, 0.06); }
|
|||
|
|
.result-item.stale { border-color: var(--vp-c-danger-1); background: rgba(239, 68, 68, 0.06); }
|
|||
|
|
|
|||
|
|
.result-label { color: var(--vp-c-text-2); }
|
|||
|
|
.result-value { font-weight: 700; }
|
|||
|
|
|
|||
|
|
.stale-warning {
|
|||
|
|
margin-top: 0.4rem;
|
|||
|
|
font-size: 0.75rem;
|
|||
|
|
color: var(--vp-c-danger-1);
|
|||
|
|
font-weight: 600;
|
|||
|
|
padding: 0.3rem 0.5rem;
|
|||
|
|
background: rgba(239, 68, 68, 0.06);
|
|||
|
|
border-radius: 4px;
|
|||
|
|
text-align: center;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.stale-warning.partial { color: var(--vp-c-warning-1); background: rgba(255, 206, 86, 0.08); }
|
|||
|
|
|
|||
|
|
.controls {
|
|||
|
|
display: flex;
|
|||
|
|
gap: 0.5rem;
|
|||
|
|
margin-bottom: 0.75rem;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.action-btn {
|
|||
|
|
padding: 0.35rem 0.8rem;
|
|||
|
|
background: var(--vp-c-brand);
|
|||
|
|
color: white;
|
|||
|
|
border: none;
|
|||
|
|
border-radius: 4px;
|
|||
|
|
cursor: pointer;
|
|||
|
|
font-size: 0.82rem;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.action-btn:disabled { opacity: 0.6; cursor: not-allowed; }
|
|||
|
|
.action-btn.outline { background: transparent; border: 1px solid var(--vp-c-divider); color: var(--vp-c-text-1); }
|
|||
|
|
.action-btn.outline:hover { border-color: var(--vp-c-brand); color: var(--vp-c-brand); }
|
|||
|
|
|
|||
|
|
.info-box {
|
|||
|
|
background: var(--vp-c-bg-alt);
|
|||
|
|
padding: 0.75rem;
|
|||
|
|
border-radius: 6px;
|
|||
|
|
font-size: 0.85rem;
|
|||
|
|
color: var(--vp-c-text-2);
|
|||
|
|
display: flex;
|
|||
|
|
gap: 0.25rem;
|
|||
|
|
line-height: 1.5;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.info-box strong { white-space: nowrap; flex-shrink: 0; color: var(--vp-c-text-1); }
|
|||
|
|
|
|||
|
|
.info-box code {
|
|||
|
|
background: var(--vp-c-bg);
|
|||
|
|
padding: 0 0.2rem;
|
|||
|
|
border-radius: 2px;
|
|||
|
|
font-size: 0.78rem;
|
|||
|
|
font-family: var(--vp-font-family-mono);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
@media (max-width: 720px) {
|
|||
|
|
.visualization-area { grid-template-columns: 1fr; }
|
|||
|
|
.toggle-bar { flex-direction: column; }
|
|||
|
|
.toggle-btn { width: 100%; }
|
|||
|
|
}
|
|||
|
|
</style>
|