278 lines
7.2 KiB
Vue
278 lines
7.2 KiB
Vue
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<template>
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<div class="encoding-explorer">
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<div class="input-row">
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<label class="input-label">输入任意文字，看看它在计算机里长什么样</label>
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<input
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v-model="inputText"
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class="text-input"
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placeholder="输入文字，如：你好 Hello 🎉"
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maxlength="20"
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/>
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<div class="quick-btns">
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<button v-for="preset in presets" :key="preset" class="preset-btn" @click="inputText = preset">
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{{ preset }}
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</button>
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</div>
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</div>
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<div v-if="inputText" class="char-breakdown">
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<div class="breakdown-header">
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<span class="col-char">字符</span>
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<span class="col-arrow">→</span>
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<span class="col-unicode">Unicode 码点</span>
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<span class="col-arrow">→</span>
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<span class="col-utf8">UTF-8 字节</span>
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<span class="col-bytes">字节数</span>
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</div>
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<transition-group name="fade" tag="div">
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<div
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v-for="(item, i) in charData"
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:key="i"
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class="char-row"
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:class="item.type"
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>
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<span class="col-char char-glyph">{{ item.char }}</span>
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<span class="col-arrow dim">→</span>
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<span class="col-unicode codepoint">{{ item.codepoint }}</span>
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<span class="col-arrow dim">→</span>
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<div class="col-utf8 bytes-grid">
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<span v-for="(b, j) in item.utf8Bytes" :key="j" class="hex-byte">{{ b }}</span>
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</div>
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<span class="col-bytes byte-count">{{ item.byteCount }} 字节</span>
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</div>
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</transition-group>
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</div>
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<div v-if="inputText" class="summary-row">
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<div class="summary-item">
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<span class="s-label">字符数</span>
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<span class="s-value">{{ charData.length }}</span>
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</div>
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<div class="summary-item">
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<span class="s-label">UTF-8 总字节数</span>
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<span class="s-value highlight">{{ totalBytes }}</span>
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</div>
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<div class="summary-item">
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<span class="s-label">平均每字符</span>
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<span class="s-value">{{ avgBytes }} 字节</span>
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</div>
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</div>
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<div class="tip-box">
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<span><strong>提示：</strong>英文字母在 UTF-8 中只占 <strong>1 字节</strong>，常用汉字占 <strong>3 字节</strong>，Emoji 占 <strong>4 字节</strong>。这就是为什么处理中文文本时，“字符数”和“字节数”是两个完全不同的概念。</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 inputText = ref('你好 Hello')
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const presets = ['你好', 'Hello', '你好 Hello', '🎉', 'AI助手']
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function toUtf8Bytes(char) {
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const bytes = []
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const encoder = new TextEncoder()
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const encoded = encoder.encode(char)
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for (const b of encoded) {
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bytes.push('0x' + b.toString(16).toUpperCase().padStart(2, '0'))
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}
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return bytes
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}
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function getCharType(char) {
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const code = char.codePointAt(0)
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if (code > 0xFFFF) return 'emoji'
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if (code > 0x4E00 && code < 0x9FFF) return 'cjk'
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if ((code >= 65 && code <= 90) || (code >= 97 && code <= 122)) return 'ascii'
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return 'other'
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}
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const charData = computed(() => {
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return [...inputText.value].slice(0, 12).map(char => {
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const utf8Bytes = toUtf8Bytes(char)
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return {
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char,
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codepoint: 'U+' + char.codePointAt(0).toString(16).toUpperCase().padStart(4, '0'),
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utf8Bytes,
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byteCount: utf8Bytes.length,
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type: getCharType(char)
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}
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})
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})
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const totalBytes = computed(() => charData.value.reduce((s, c) => s + c.byteCount, 0))
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const avgBytes = computed(() => charData.value.length ? (totalBytes.value / charData.value.length).toFixed(1) : 0)
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</script>
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<style scoped>
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.encoding-explorer {
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border: 1px solid var(--vp-c-divider);
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border-radius: 8px;
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background: var(--vp-c-bg-soft);
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padding: 1.25rem;
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margin: 1rem 0;
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display: flex;
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flex-direction: column;
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gap: 1rem;
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font-family: var(--vp-font-family-base);
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}
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.input-label {
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display: block;
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font-size: 0.88rem;
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font-weight: bold;
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margin-bottom: 0.5rem;
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}
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.text-input {
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width: 100%;
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padding: 0.5rem 0.75rem;
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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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font-size: 1rem;
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color: var(--vp-c-text-1);
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outline: none;
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transition: border-color 0.2s;
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box-sizing: border-box;
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}
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.text-input:focus { border-color: var(--vp-c-brand); }
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.quick-btns {
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display: flex;
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gap: 0.4rem;
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flex-wrap: wrap;
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margin-top: 0.5rem;
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}
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.preset-btn {
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padding: 0.2rem 0.6rem;
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border: 1px solid var(--vp-c-divider);
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background: var(--vp-c-bg);
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border-radius: 4px;
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cursor: pointer;
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font-size: 0.8rem;
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transition: all 0.15s;
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}
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.preset-btn:hover {
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background: var(--vp-c-brand-soft);
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border-color: var(--vp-c-brand);
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}
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.char-breakdown {
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background: var(--vp-c-bg);
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border-radius: 6px;
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overflow: hidden;
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border: 1px solid var(--vp-c-divider);
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}
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.breakdown-header {
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display: flex;
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align-items: center;
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padding: 0.5rem 0.75rem;
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background: var(--vp-c-bg-alt);
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font-size: 0.78rem;
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font-weight: bold;
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color: var(--vp-c-text-2);
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gap: 0.5rem;
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}
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.char-row {
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display: flex;
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align-items: center;
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padding: 0.5rem 0.75rem;
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border-top: 1px solid var(--vp-c-divider);
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gap: 0.5rem;
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transition: background 0.2s;
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}
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.char-row:hover { background: var(--vp-c-bg-soft); }
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.char-row.emoji { border-left: 3px solid #f59e0b; }
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.char-row.cjk { border-left: 3px solid var(--vp-c-brand); }
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.char-row.ascii { border-left: 3px solid var(--vp-c-green-1); }
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.char-row.other { border-left: 3px solid var(--vp-c-divider); }
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.col-char { width: 2.5rem; text-align: center; }
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.col-unicode { width: 6rem; font-family: monospace; font-size: 0.82rem; color: var(--vp-c-brand); }
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.col-utf8 { flex: 1; }
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.col-bytes { width: 4.5rem; text-align: right; font-size: 0.8rem; }
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.col-arrow { color: var(--vp-c-divider); font-size: 0.8rem; }
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.char-glyph { font-size: 1.4rem; font-weight: bold; }
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.codepoint { font-family: monospace; }
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.dim { opacity: 0.4; }
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.bytes-grid {
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display: flex;
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flex-wrap: wrap;
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gap: 0.25rem;
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}
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.hex-byte {
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background: var(--vp-c-bg-alt);
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border: 1px solid var(--vp-c-divider);
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border-radius: 3px;
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padding: 1px 5px;
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font-family: monospace;
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font-size: 0.75rem;
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color: var(--vp-c-text-2);
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}
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.byte-count {
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font-weight: bold;
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color: var(--vp-c-text-2);
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white-space: nowrap;
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}
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.summary-row {
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display: flex;
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gap: 1rem;
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flex-wrap: wrap;
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}
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.summary-item {
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flex: 1;
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min-width: 100px;
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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 0.75rem;
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display: flex;
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flex-direction: column;
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align-items: center;
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gap: 0.15rem;
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}
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.s-label {
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font-size: 0.75rem;
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color: var(--vp-c-text-2);
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}
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.s-value {
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font-size: 1.4rem;
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font-weight: bold;
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}
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.s-value.highlight { color: var(--vp-c-brand); }
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.tip-box {
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background: var(--vp-c-bg-alt);
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border-left: 4px solid var(--vp-c-yellow-1);
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padding: 0.75rem 1rem;
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border-radius: 0 6px 6px 0;
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font-size: 0.85rem;
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color: var(--vp-c-text-1);
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line-height: 1.6;
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display: flex;
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gap: 0.5rem;
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}
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.tip-icon { font-size: 1rem; flex-shrink: 0; }
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.fade-enter-active, .fade-leave-active { transition: opacity 0.2s; }
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.fade-enter-from, .fade-leave-to { opacity: 0; }
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</style>
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