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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>文本对比工具 - Diff Checker</title>
<script src="https://cdn.jsdelivr.net/npm/mammoth@1.8.0/mammoth.browser.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/xlsx@0.18.5/dist/xlsx.full.min.js"></script>
<style>
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
background: #f5f5f5;
color: #333;
min-height: 100vh;
}
.header {
text-align: center;
padding: 24px 16px 8px;
}
.header h1 {
font-size: 24px;
font-weight: 700;
color: #1a1a1a;
}
.header p {
margin-top: 4px;
font-size: 14px;
color: #888;
}
.container {
max-width: 1400px;
margin: 0 auto;
padding: 12px 16px 40px;
}
/* 输入区域 */
.input-panels {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 16px;
margin-bottom: 16px;
}
.input-panel { display: flex; flex-direction: column; }
.input-panel label {
font-size: 13px;
font-weight: 600;
color: #555;
margin-bottom: 6px;
display: flex;
align-items: center;
gap: 8px;
}
.input-panel label .badge {
font-size: 11px;
font-weight: 400;
padding: 1px 8px;
border-radius: 999px;
color: #fff;
}
.badge.original { background: #e03131; }
.badge.modified { background: #2b8a3e; }
.input-panel textarea {
flex: 1;
min-height: 260px;
border: 2px solid #e0e0e0;
border-radius: 10px;
padding: 12px 14px;
font-family: "SF Mono", "Cascadia Code", "Consolas", "PingFang SC", monospace;
font-size: 14px;
line-height: 1.7;
resize: vertical;
transition: border-color .2s;
background: #fff;
}
.input-panel textarea:focus {
outline: none;
border-color: #4dabf7;
}
/* 按钮行 */
.btn-row {
display: flex;
gap: 10px;
flex-wrap: wrap;
align-items: center;
margin-bottom: 16px;
}
.btn {
padding: 10px 20px;
border: none;
border-radius: 8px;
font-size: 14px;
font-weight: 600;
cursor: pointer;
transition: background .2s, transform .1s;
display: flex;
align-items: center;
gap: 6px;
}
.btn:active { transform: scale(0.96); }
.btn-primary {
background: #4dabf7;
color: #fff;
font-size: 15px;
padding: 12px 28px;
}
.btn-primary:hover { background: #339af0; }
.btn-secondary {
background: #fff;
color: #555;
border: 2px solid #e0e0e0;
}
.btn-secondary:hover { background: #f5f5f5; }
.btn-danger {
background: #fff;
color: #e03131;
border: 2px solid #ffc9c9;
}
.btn-danger:hover { background: #fff5f5; }
/* 统计条 */
.stats-bar {
display: flex;
gap: 20px;
flex-wrap: wrap;
padding: 10px 16px;
background: #fff;
border-radius: 10px;
margin-bottom: 16px;
font-size: 13px;
align-items: center;
border: 1px solid #e8e8e8;
min-height: 42px;
}
.stats-bar.hidden { display: none; }
.stat-item {
display: flex;
align-items: center;
gap: 6px;
font-weight: 500;
}
.stat-dot {
width: 10px; height: 10px;
border-radius: 50%;
display: inline-block;
}
.stat-dot.added { background: #b2f2bb; border: 1px solid #2b8a3e; }
.stat-dot.removed { background: #ffc9c9; border: 1px solid #e03131; }
.stat-dot.unchanged { background: #e9ecef; border: 1px solid #adb5bd; }
/* 结果区域 */
.result-panels {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 16px;
}
.result-panel {
background: #fff;
border: 1px solid #e8e8e8;
border-radius: 10px;
overflow: hidden;
}
.result-panel-header {
padding: 8px 14px;
font-size: 12px;
font-weight: 600;
color: #888;
border-bottom: 1px solid #eee;
background: #fafafa;
}
.result-content {
max-height: 520px;
overflow-y: auto;
font-family: "SF Mono", "Cascadia Code", "Consolas", "PingFang SC", monospace;
font-size: 13px;
line-height: 1.8;
}
.result-content::-webkit-scrollbar { width: 6px; }
.result-content::-webkit-scrollbar-thumb { background: #ccc; border-radius: 3px; }
.diff-line {
display: flex;
min-height: 24px;
border-bottom: 1px solid #f5f5f5;
}
.diff-line-num {
flex-shrink: 0;
width: 44px;
text-align: right;
padding: 2px 8px 2px 4px;
color: #adb5bd;
font-size: 11px;
user-select: none;
background: #fafafa;
border-right: 1px solid #eee;
}
.diff-line-text {
flex: 1;
padding: 2px 10px;
white-space: pre-wrap;
word-break: break-all;
}
.diff-line.added .diff-line-text { background: #d3f9d8; }
.diff-line.added .diff-line-num { background: #b2f2bb; color: #2b8a3e; }
.diff-line.removed .diff-line-text { background: #ffe3e3; }
.diff-line.removed .diff-line-num { background: #ffc9c9; color: #e03131; }
.diff-line.unchanged .diff-line-text { background: #fff; }
.diff-line.unchanged .diff-line-num { background: #fafafa; }
.diff-line.placeholder .diff-line-text { background: #f8f8f8; }
.diff-line.placeholder .diff-line-num { background: #f5f5f5; color: #ccc; }
/* 模式切换 */
.mode-toggle {
display: inline-flex;
border-radius: 8px;
overflow: hidden;
border: 2px solid #e0e0e0;
}
.mode-btn {
padding: 8px 16px;
border: none;
background: #fff;
color: #888;
font-size: 13px;
font-weight: 600;
cursor: pointer;
transition: background .2s, color .2s;
}
.mode-btn + .mode-btn { border-left: 2px solid #e0e0e0; }
.mode-btn.active { background: #4dabf7; color: #fff; }
/* 字符级高亮 */
.char-added { background: #b2f2bb; border-radius: 2px; }
.char-removed { background: #ffc9c9; border-radius: 2px; text-decoration: line-through; }
.char-equal { }
/* 上传按钮 */
.upload-btn {
font-size: 11px;
font-weight: 500;
padding: 3px 10px;
border: 1px solid #d0d0d0;
border-radius: 5px;
background: #fff;
color: #888;
cursor: pointer;
transition: background .15s;
display: inline-flex;
align-items: center;
gap: 4px;
}
.upload-btn:hover { background: #f0f0f0; color: #555; }
.file-name {
font-size: 11px;
color: #4dabf7;
font-weight: 400;
max-width: 140px;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
textarea.drag-over { border-color: #4dabf7; background: #f0f7ff; }
/* 字符级高亮暗色 */
@media (prefers-color-scheme: dark) {
.mode-toggle { border-color: #444; }
.mode-btn { background: #1a1a2e; color: #999; }
.mode-btn + .mode-btn { border-color: #444; }
.mode-btn.active { background: #4dabf7; color: #fff; }
.char-added { background: #1b4a1b; }
.char-removed { background: #4a1b1b; }
.upload-btn { background: #1a1a2e; border-color: #444; color: #999; }
.upload-btn:hover { background: #222; color: #ccc; }
textarea.drag-over { background: #1a2a3e; }
}
/* 空状态 */
.empty-state {
text-align: center;
padding: 40px 20px;
color: #bbb;
font-size: 14px;
}
.empty-state .icon { font-size: 40px; margin-bottom: 10px; display: block; }
/* 提示消息 */
.toast {
position: fixed;
bottom: 30px;
left: 50%;
transform: translateX(-50%);
background: #333;
color: #fff;
padding: 10px 24px;
border-radius: 20px;
font-size: 13px;
opacity: 0;
pointer-events: none;
transition: opacity .25s;
z-index: 999;
}
.toast.show { opacity: 1; }
/* 响应式 */
@media (max-width: 768px) {
.input-panels {
grid-template-columns: 1fr;
}
.input-panel textarea {
min-height: 180px;
}
.result-panels {
grid-template-columns: 1fr;
}
.btn-row { justify-content: center; }
}
@media (prefers-color-scheme: dark) {
body { background: #1a1a2e; color: #ccc; }
.header h1 { color: #e0e0e0; }
.header p { color: #999; }
.input-panel label { color: #bbb; }
.input-panel textarea {
background: #16213e;
border-color: #333;
color: #ddd;
}
.input-panel textarea:focus { border-color: #4dabf7; }
.btn-secondary { background: #1a1a2e; color: #ccc; border-color: #444; }
.btn-secondary:hover { background: #222; }
.btn-danger { background: #1a1a2e; border-color: #5c1a1a; }
.btn-danger:hover { background: #2b1a1a; }
.result-panel, .stats-bar { background: #16213e; border-color: #333; }
.result-panel-header { background: #1a1a2e; border-color: #333; color: #999; }
.result-content::-webkit-scrollbar-thumb { background: #555; }
.diff-line-num { background: #1a1a2e; color: #777; border-color: #333; }
.diff-line { border-color: #2a2a2a; }
.diff-line.added .diff-line-text { background: #1b3a1b; }
.diff-line.added .diff-line-num { background: #1b4a1b; color: #69db7c; }
.diff-line.removed .diff-line-text { background: #3a1b1b; }
.diff-line.removed .diff-line-num { background: #4a1b1b; color: #ff8787; }
.diff-line.unchanged .diff-line-text { background: #16213e; }
.diff-line.unchanged .diff-line-num { background: #1a1a2e; }
.diff-line.placeholder .diff-line-text { background: #1a1a2e; }
.diff-line.placeholder .diff-line-num { background: #1a1a2e; color: #555; }
.stat-dot.unchanged { background: #444; }
.toast { background: #e0e0e0; color: #1a1a1a; }
}
</style>
</head>
<body>
<div class="header">
<h1>文本对比工具</h1>
<p>粘贴文本、上传文件或拖拽文件，秒看差异</p>
</div>
<div class="container">
<!-- 输入区 -->
<div class="input-panels">
<div class="input-panel">
<label>
<span class="badge original">原始</span> 原始文本
<button class="upload-btn" id="btnUploadLeft">📂 上传文件</button>
<span class="file-name" id="fileNameLeft"></span>
</label>
<input type="file" id="fileInputLeft" accept=".txt,.md,.json,.xml,.html,.htm,.css,.js,.jsx,.ts,.tsx,.py,.java,.c,.cpp,.h,.hpp,.rs,.go,.rb,.php,.sql,.csv,.log,.yaml,.yml,.toml,.ini,.cfg,.sh,.bat,.ps1,.tex,.rst,.text,.docx,.xlsx,.xls" hidden>
<textarea id="original" placeholder="在此粘贴原始文本...或拖入文件"></textarea>
</div>
<div class="input-panel">
<label>
<span class="badge modified">修改</span> 修改后文本
<button class="upload-btn" id="btnUploadRight">📂 上传文件</button>
<span class="file-name" id="fileNameRight"></span>
</label>
<input type="file" id="fileInputRight" accept=".txt,.md,.json,.xml,.html,.htm,.css,.js,.jsx,.ts,.tsx,.py,.java,.c,.cpp,.h,.hpp,.rs,.go,.rb,.php,.sql,.csv,.log,.yaml,.yml,.toml,.ini,.cfg,.sh,.bat,.ps1,.tex,.rst,.text,.docx,.xlsx,.xls" hidden>
<textarea id="modified" placeholder="在此粘贴修改后的文本...或拖入文件"></textarea>
</div>
</div>
<!-- 按钮 -->
<div class="btn-row">
<button class="btn btn-primary" id="btnDiff">开始对比</button>
<div class="mode-toggle" id="modeToggle">
<button class="mode-btn active" data-mode="line">按行</button>
<button class="mode-btn" data-mode="char">按字</button>
</div>
<button class="btn btn-secondary" id="btnSwap">交换左右</button>
<button class="btn btn-danger" id="btnClear">清空</button>
</div>
<!-- 统计 -->
<div class="stats-bar hidden" id="statsBar"></div>
<!-- 结果区 -->
<div class="result-panels" id="resultPanels">
<div class="result-panel">
<div class="result-panel-header">原始文本差异</div>
<div class="result-content" id="resultLeft">
<div class="empty-state">
<span class="icon">↔</span>
点击「开始对比」查看差异
</div>
</div>
</div>
<div class="result-panel">
<div class="result-panel-header">修改后文本差异</div>
<div class="result-content" id="resultRight">
<div class="empty-state">
<span class="icon">↔</span>
点击「开始对比」查看差异
</div>
</div>
</div>
</div>
<div class="btn-row" style="margin-top:12px;">
<button class="btn btn-secondary" id="btnCopy" style="display:none;">复制对比结果</button>
</div>
</div>
<div class="toast" id="toast"></div>
<script>
(function() {
/* ====== 工具函数 ====== */
function esc(str) {
if (!str) return '';
return str.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"');
}
/* ====== LCS 算法（逐行） ====== */
function lineLCS(oldLines, newLines) {
const m = oldLines.length;
const n = newLines.length;
const dp = Array.from({ length: m + 1 }, () => new Int32Array(n + 1));
for (let i = 1; i <= m; i++) {
for (let j = 1; j <= n; j++) {
if (oldLines[i - 1] === newLines[j - 1]) {
dp[i][j] = dp[i - 1][j - 1] + 1;
} else {
dp[i][j] = Math.max(dp[i - 1][j], dp[i][j - 1]);
}
}
}
const result = [];
let i = m, j = n;
while (i > 0 || j > 0) {
if (i > 0 && j > 0 && oldLines[i - 1] === newLines[j - 1]) {
result.push({ type: 'unchanged', oldLine: oldLines[i - 1], newLine: newLines[j - 1] });
i--; j--;
} else if (j > 0 && (i === 0 || dp[i][j - 1] >= dp[i - 1][j])) {
result.push({ type: 'added', oldLine: null, newLine: newLines[j - 1] });
j--;
} else {
result.push({ type: 'removed', oldLine: oldLines[i - 1], newLine: null });
i--;
}
}
return result.reverse();
}
/* ====== LCS 算法（逐字符），返回 {type, char}[] ====== */
function charLCS(s1, s2) {
const chars1 = [...s1];
const chars2 = [...s2];
// 裁剪公共前缀/后缀以减少 DP 表
let pre = 0;
while (pre < chars1.length && pre < chars2.length && chars1[pre] === chars2[pre]) pre++;
let suf = 0;
const minLen = Math.min(chars1.length - pre, chars2.length - pre);
while (suf < minLen && chars1[chars1.length - 1 - suf] === chars2[chars2.length - 1 - suf]) suf++;
const core1 = chars1.slice(pre, chars1.length - suf);
const core2 = chars2.slice(pre, chars2.length - suf);
const m = core1.length;
const n = core2.length;
// 限制大小，防止超大文本卡死
const MAX_CORE = 6000;
if (m > MAX_CORE || n > MAX_CORE) {
return null; // 降级为行内逐字
}
if (m === 0 && n === 0) {
// 全部相同
return chars1.map(c => ({ type: 'equal', char: c }));
}
const dp = Array.from({ length: m + 1 }, () => new Uint16Array(n + 1));
// 检查溢出
let overflow = false;
for (let i = 1; i <= m && !overflow; i++) {
for (let j = 1; j <= n && !overflow; j++) {
if (core1[i - 1] === core2[j - 1]) {
dp[i][j] = dp[i - 1][j - 1] + 1;
if (dp[i][j] === 65535 && i < m && j < n) overflow = true;
} else {
dp[i][j] = Math.max(dp[i - 1][j], dp[i][j - 1]);
}
}
}
if (overflow) return null;
// 回溯
const coreResult = [];
let i = m, j = n;
while (i > 0 || j > 0) {
if (i > 0 && j > 0 && core1[i - 1] === core2[j - 1]) {
coreResult.push({ type: 'equal', char: core1[i - 1] });
i--; j--;
} else if (j > 0 && (i === 0 || dp[i][j - 1] >= dp[i - 1][j])) {
coreResult.push({ type: 'insert', char: core2[j - 1] });
j--;
} else {
coreResult.push({ type: 'delete', char: core1[i - 1] });
i--;
}
}
coreResult.reverse();
// 拼接前缀、核心、后缀
const prefixOps = chars1.slice(0, pre).map(c => ({ type: 'equal', char: c }));
const suffixOps = chars1.slice(chars1.length - suf).map(c => ({ type: 'equal', char: c }));
return [...prefixOps, ...coreResult, ...suffixOps];
}
/* ====== 字符级 diff → 对齐的行对 ====== */
// 返回 [{left: {segments}, right: {segments}}, ...]，segment 含 type 和 text
function charOpsToLinePairs(charOps) {
const pairs = [];
let curLeft = [];
let curRight = [];
function emit() {
// 合并同类型相邻段
function merge(segs) {
const out = [];
for (const s of segs) {
if (out.length > 0 && out[out.length - 1].type === s.type) {
out[out.length - 1].text += s.text;
} else {
out.push({ type: s.type, text: s.text });
}
}
return out;
}
pairs.push({ left: merge(curLeft), right: merge(curRight) });
curLeft = [];
curRight = [];
}
for (const op of charOps) {
if (op.type === 'equal') {
if (op.char === '\n') {
emit();
} else {
curLeft.push({ type: 'equal', text: op.char });
curRight.push({ type: 'equal', text: op.char });
}
} else if (op.type === 'delete') {
if (op.char === '\n') {
emit();
} else {
curLeft.push({ type: 'deleted', text: op.char });
}
} else { // insert
if (op.char === '\n') {
emit();
} else {
curRight.push({ type: 'added', text: op.char });
}
}
}
if (curLeft.length > 0 || curRight.length > 0) emit();
return pairs;
}
/* ====== 构建字符级高亮的行 HTML ====== */
function buildCharLineHTML(segments, side, lineNum) {
// side: 'left' 显示 deleted, 'right' 显示 added
if (!segments || segments.length === 0) {
return diffLineHTML('placeholder', '', '');
}
// 判断整行状态
const hasHighlight = segments.some(s => s.type === 'deleted' || s.type === 'added');
let rowClass = 'unchanged';
if (hasHighlight && side === 'left') {
const allDel = segments.every(s => s.type === 'deleted');
rowClass = allDel ? 'removed' : 'unchanged';
} else if (hasHighlight && side === 'right') {
const allAdd = segments.every(s => s.type === 'added');
rowClass = allAdd ? 'added' : 'unchanged';
}
let html = '';
for (const seg of segments) {
const text = esc(seg.text);
if (seg.type === 'deleted' && side === 'left') {
html += '<span class="char-removed">' + text + '</span>';
} else if (seg.type === 'added' && side === 'right') {
html += '<span class="char-added">' + text + '</span>';
} else if (seg.type === 'equal') {
html += '<span class="char-equal">' + text + '</span>';
} else {
// 对面侧的内容，本侧不显示（但保留空白占位符用于对齐）
// deleted 字符在 right 侧不渲染，added 字符在 left 侧不渲染
}
}
if (!html) {
return diffLineHTML('placeholder', '', '');
}
const numDisplay = lineNum !== '' ? lineNum : '';
return '<div class="diff-line ' + rowClass + '"><span class="diff-line-num">' + numDisplay + '</span><span class="diff-line-text">' + html + '</span></div>';
}
/* ====== 按行模式：渲染 ====== */
function renderLineDiff(lineDiffResult) {
const leftDiv = document.getElementById('resultLeft');
const rightDiv = document.getElementById('resultRight');
let leftHTML = '';
let rightHTML = '';
let leftNum = 1;
let rightNum = 1;
let addedCount = 0;
let removedCount = 0;
let unchangedCount = 0;
for (const item of lineDiffResult) {
switch (item.type) {
case 'unchanged':
leftHTML += diffLineHTML('unchanged', leftNum++, esc(item.oldLine));
rightHTML += diffLineHTML('unchanged', rightNum++, esc(item.newLine));
unchangedCount++;
break;
case 'removed':
leftHTML += diffLineHTML('removed', leftNum++, esc(item.oldLine));
rightHTML += diffLineHTML('placeholder', '', '');
removedCount++;
break;
case 'added':
leftHTML += diffLineHTML('placeholder', '', '');
rightHTML += diffLineHTML('added', rightNum++, esc(item.newLine));
addedCount++;
break;
}
}
leftDiv.innerHTML = leftHTML || '<div class="empty-state">内容完全相同</div>';
rightDiv.innerHTML = rightHTML || '<div class="empty-state">内容完全相同</div>';
return { addedCount, removedCount, unchangedCount };
}
/* ====== 按字模式：混合算法 ====== */
// 正文过短（<=2 行）或全文 <=6000 字符时，做全文逐字 LCS
// 否则，做逐行 LCS，再对每个「变化块」做块内逐字 LCS
function computeCharDiff(oldText, newText) {
const oldLines = oldText.split('\n');
const newLines = newText.split('\n');
// 全文逐字 LCS
const fullCharOps = charLCS(oldText, newText);
if (fullCharOps) {
return charOpsToLinePairs(fullCharOps);
}
// 降级：逐行 LCS → 变化块内逐字
const lineOps = lineLCS(oldLines, newLines);
// 收集变化块
const blocks = [];
let cur = null;
for (const op of lineOps) {
if (op.type === 'unchanged') {
if (cur && cur.type === 'changed') { blocks.push(cur); cur = null; }
blocks.push({ type: 'unchanged', oldLine: op.oldLine, newLine: op.newLine });
} else {
if (!cur || cur.type !== 'changed') {
if (cur) blocks.push(cur);
cur = { type: 'changed', oldLines: [], newLines: [] };
}
if (op.type === 'removed') cur.oldLines.push(op.oldLine);
else cur.newLines.push(op.newLine);
}
}
if (cur) blocks.push(cur);
// 构建行对
const pairs = [];
let leftLineIdx = 0;
let rightLineIdx = 0;
for (const block of blocks) {
if (block.type === 'unchanged') {
pairs.push({
left: [{ type: 'equal', text: block.oldLine }],
right: [{ type: 'equal', text: block.newLine }]
});
leftLineIdx++; rightLineIdx++;
} else {
// 变化块：拼接所有行，做逐字 LCS
const oldBlock = block.oldLines.join('\n');
const newBlock = block.newLines.join('\n');
const blockCharOps = charLCS(oldBlock, newBlock);
if (blockCharOps) {
const blockPairs = charOpsToLinePairs(blockCharOps);
for (const p of blockPairs) pairs.push(p);
} else {
// 块内逐字也太大，退回整行高亮
for (const ol of block.oldLines) {
pairs.push({
left: [{ type: 'deleted', text: ol }],
right: []
});
}
for (const nl of block.newLines) {
pairs.push({
left: [],
right: [{ type: 'added', text: nl }]
});
}
}
}
}
// 重新对齐：确保左右行数一致
return realignPairs(pairs);
}
function realignPairs(pairs) {
// 保证每个 pair 都有 left 和 right，缺失的补占位
const result = [];
for (const p of pairs) {
const lp = p.left && p.left.length > 0 ? p.left : [];
const rp = p.right && p.right.length > 0 ? p.right : [];
result.push({ left: lp, right: rp });
}
return result;
}
/* ====== 按字模式：渲染 ====== */
function renderCharDiff(pairs) {
const leftDiv = document.getElementById('resultLeft');
const rightDiv = document.getElementById('resultRight');
let leftHTML = '';
let rightHTML = '';
let leftNum = 0;
let rightNum = 0;
let addedCount = 0;
let removedCount = 0;
let unchangedCount = 0;
for (const pair of pairs) {
const hasLeft = pair.left.some(s => s.type === 'equal' || s.type === 'deleted');
const hasRight = pair.right.some(s => s.type === 'equal' || s.type === 'added');
const leftOnlyDel = pair.left.length > 0 && pair.left.every(s => s.type === 'deleted');
const rightOnlyAdd = pair.right.length > 0 && pair.right.every(s => s.type === 'added');
const bothEq = pair.left.length > 0 && pair.right.length > 0 &&
pair.left.every(s => s.type === 'equal') &&
pair.right.every(s => s.type === 'equal');
if (hasLeft) leftNum++;
if (hasRight) rightNum++;
// 统计
if (leftOnlyDel && !hasRight) removedCount++;
else if (rightOnlyAdd && !hasLeft) addedCount++;
else if (bothEq) unchangedCount++;
else {
// 混合行：按字符统计
const totalChars = pair.left.reduce((s, seg) => s + seg.text.length, 0) +
pair.right.reduce((s, seg) => s + seg.text.length, 0);
if (totalChars === 0) unchangedCount++;
else if (leftOnlyDel) removedCount++;
else if (rightOnlyAdd) addedCount++;
else unchangedCount++;
}
leftHTML += buildCharLineHTML(pair.left, 'left', hasLeft ? leftNum : '');
rightHTML += buildCharLineHTML(pair.right, 'right', hasRight ? rightNum : '');
}
leftDiv.innerHTML = leftHTML || '<div class="empty-state">内容完全相同</div>';
rightDiv.innerHTML = rightHTML || '<div class="empty-state">内容完全相同</div>';
return { addedCount, removedCount, unchangedCount };
}
function diffLineHTML(cls, lineNum, text) {
const numDisplay = lineNum !== '' ? lineNum : '';
return '<div class="diff-line ' + cls + '"><span class="diff-line-num">' + numDisplay + '</span><span class="diff-line-text">' + text + '</span></div>';
}
/* ====== 统计条 ====== */
function updateStats(added, removed, unchanged) {
const bar = document.getElementById('statsBar');
bar.classList.remove('hidden');
bar.innerHTML =
'<span>对比结果：</span>' +
'<span class="stat-item"><span class="stat-dot added"></span> +' + added + ' 新增</span>' +
'<span class="stat-item"><span class="stat-dot removed"></span> -' + removed + ' 删除</span>' +
'<span class="stat-item"><span class="stat-dot unchanged"></span> =' + unchanged + ' 未变</span>';
}
/* ====== 同步滚动 ====== */
function syncScroll() {
const leftRC = document.getElementById('resultLeft');
const rightRC = document.getElementById('resultRight');
let syncing = false;
function sync(source, target) {
if (syncing) return;
syncing = true;
target.scrollTop = source.scrollTop;
target.scrollLeft = source.scrollLeft;
syncing = false;
}
leftRC.addEventListener('scroll', () => sync(leftRC, rightRC), { passive: true });
rightRC.addEventListener('scroll', () => sync(rightRC, leftRC), { passive: true });
}
/* ====== Toast ====== */
function showToast(msg) {
const t = document.getElementById('toast');
t.textContent = msg;
t.classList.add('show');
clearTimeout(t._tid);
t._tid = setTimeout(() => t.classList.remove('show'), 1800);
}
/* ====== 当前模式 ====== */
let currentMode = 'line';
let lastDiffResult = null; // 缓存上一次对比结果（供复制用）
/* ====== 主流程 ====== */
function runDiff() {
const oldText = document.getElementById('original').value;
const newText = document.getElementById('modified').value;
if (!oldText.trim() && !newText.trim()) {
showToast('请至少在一侧输入文本');
return;
}
let stats;
if (currentMode === 'line') {
const oldLines = oldText.split('\n');
const newLines = newText.split('\n');
const diff = lineLCS(oldLines, newLines);
stats = renderLineDiff(diff);
lastDiffResult = { mode: 'line', diff: diff };
} else {
const pairs = computeCharDiff(oldText, newText);
stats = renderCharDiff(pairs);
lastDiffResult = { mode: 'char', pairs: pairs };
}
updateStats(stats.addedCount, stats.removedCount, stats.unchangedCount);
document.getElementById('btnCopy').style.display = 'inline-flex';
document.getElementById('resultPanels').scrollIntoView({ behavior: 'smooth', block: 'start' });
}
function clearAll() {
document.getElementById('original').value = '';
document.getElementById('modified').value = '';
document.getElementById('resultLeft').innerHTML = '<div class="empty-state"><span class="icon">↔</span>点击「开始对比」查看差异</div>';
document.getElementById('resultRight').innerHTML = '<div class="empty-state"><span class="icon">↔</span>点击「开始对比」查看差异</div>';
document.getElementById('statsBar').classList.add('hidden');
document.getElementById('btnCopy').style.display = 'none';
document.getElementById('fileNameLeft').textContent = '';
document.getElementById('fileNameRight').textContent = '';
lastDiffResult = null;
}
function swapSides() {
const o = document.getElementById('original');
const m = document.getElementById('modified');
const tmp = o.value;
o.value = m.value;
m.value = tmp;
showToast('已交换左右内容');
}
function copyResult() {
if (!lastDiffResult) { showToast('请先执行对比'); return; }
let text = '=== 文本对比结果 ===\n\n';
if (lastDiffResult.mode === 'line') {
text += '模式：按行对比\n标记: [+] 新增行 [-] 删除行 [ ] 未修改\n\n';
for (const item of lastDiffResult.diff) {
if (item.type === 'unchanged') text += ' ' + item.oldLine + '\n';
else if (item.type === 'removed') text += '[-] ' + item.oldLine + '\n';
else if (item.type === 'added') text += '[+] ' + item.newLine + '\n';
}
} else {
text += '模式：按字对比\n标记: {+新增+} {-删除-}\n\n';
const pairs = lastDiffResult.pairs;
const maxLen = Math.max(
...pairs.map(p => {
const ls = p.left.reduce((s, seg) => s + seg.text.length, 0);
const rs = p.right.reduce((s, seg) => s + seg.text.length, 0);
return Math.max(ls, rs);
}),
0
);
for (const pair of pairs) {
let leftStr = '';
let rightStr = '';
for (const seg of pair.left) {
if (seg.type === 'equal') leftStr += seg.text;
else if (seg.type === 'deleted') leftStr += '{-' + seg.text + '-}';
}
for (const seg of pair.right) {
if (seg.type === 'equal') rightStr += seg.text;
else if (seg.type === 'added') rightStr += '{+' + seg.text + '+}';
}
if (leftStr || rightStr) {
text += (leftStr || '(空)') + ' | ' + (rightStr || '(空)') + '\n';
}
}
}
navigator.clipboard.writeText(text).then(() => {
showToast('已复制对比结果');
}).catch(() => {
showToast('复制失败，请手动复制');
});
}
/* ====== 模式切换 ====== */
function setMode(mode) {
currentMode = mode;
document.querySelectorAll('.mode-btn').forEach(b => {
b.classList.toggle('active', b.dataset.mode === mode);
});
// 如果已有输入内容，自动重新对比
const oldText = document.getElementById('original').value;
const newText = document.getElementById('modified').value;
if ((oldText.trim() || newText.trim()) && lastDiffResult) {
runDiff();
}
}
/* ====== 文件读取（支持 .docx / .xlsx / 纯文本） ====== */
function readFileContent(file, callback, errorCallback) {
const name = file.name.toLowerCase();
// .docx → Mammoth.js
if (name.endsWith('.docx')) {
const reader = new FileReader();
reader.onload = () => {
if (typeof mammoth === 'undefined') { errorCallback('Mammoth.js 未加载，请检查网络'); return; }
mammoth.extractRawText({ arrayBuffer: reader.result })
.then(result => callback(result.value))
.catch(() => errorCallback('.docx 解析失败'));
};
reader.onerror = () => errorCallback('读取文件失败');
reader.readAsArrayBuffer(file);
return;
}
// .xlsx / .xls → SheetJS
if (name.endsWith('.xlsx') || name.endsWith('.xls')) {
const reader = new FileReader();
reader.onload = () => {
if (typeof XLSX === 'undefined') { errorCallback('SheetJS 未加载，请检查网络'); return; }
try {
const wb = XLSX.read(reader.result, { type: 'array' });
const texts = [];
wb.SheetNames.forEach(sheetName => {
const ws = wb.Sheets[sheetName];
const csv = XLSX.utils.sheet_to_csv(ws, { blankrows: false });
if (csv.trim()) {
texts.push('=== ' + sheetName + ' ===\n' + csv);
}
});
callback(texts.join('\n\n'));
} catch (e) {
errorCallback('Excel 解析失败');