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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>文本差异对比工具</title>
<link rel="icon" type="image/svg+xml" href="favicon.svg">
<style>
:root {
--bg: #f6f7f9;
--panel: #ffffff;
--border: #e5e7eb;
--border-strong: #d1d5db;
--text: #1f2328;
--text-muted: #6b7280;
--text-faint: #9ca3af;
--accent: #2563eb;
--accent-hover: #1d4ed8;
--accent-soft: #eff6ff;
--danger: #dc2626;
--danger-soft: #fef2f2;
--shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
--radius: 10px;
/* diff 专用配色（新增变量） */
--c-add: #16a34a;
--c-add-bg: #dcfce7;
--c-add-strong: #bbf7d0;
--c-del: #dc2626;
--c-del-bg: #fee2e2;
--c-del-strong: #fecaca;
--c-change-bg: #fef9c3;
}
html.dark {
--bg: #0d1117;
--panel: #161b22;
--border: #30363d;
--border-strong: #484f58;
--text: #e6edf3;
--text-muted: #9198a1;
--text-faint: #6e7681;
--accent: #58a6ff;
--accent-hover: #79b8ff;
--accent-soft: #1a2332;
--danger: #f87171;
--danger-soft: #2a1a1c;
--shadow: 0 1px 3px rgba(0,0,0,.4);
--c-add: #4ade80;
--c-add-bg: #14532d;
--c-add-strong: #166534;
--c-del: #f87171;
--c-del-bg: #7f1d1d;
--c-del-strong: #991b1b;
--c-change-bg: #713f12;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
"Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
background: var(--bg);
color: var(--text);
-webkit-font-smoothing: antialiased;
display: flex;
flex-direction: column;
}
/* ---------- Header ---------- */
header {
display: flex; align-items: center; gap: 12px;
padding: 14px 20px; background: var(--panel);
border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 650; }
.logo .mark {
width: 30px; height: 30px; border-radius: 8px;
display: grid; place-items: center;
background: linear-gradient(135deg, #2563eb, #7c3aed);
color: #fff; font-size: 16px; font-weight: 700; line-height: 1;
}
.logo .sub { font-size: 12px; color: var(--text-muted); font-weight: 400; }
.spacer { flex: 1; }
.icon-btn {
width: 36px; height: 36px; border-radius: 8px;
border: 1px solid var(--border); background: var(--panel);
color: var(--text-muted); cursor: pointer;
display: grid; place-items: center; transition: all .15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); background: var(--bg); }
.icon-btn svg { width: 18px; height: 18px; }
header .icon-btn { border: none; background: transparent; }
header .icon-btn:hover { background: var(--bg); border-color: transparent; }
/* ---------- Toolbar ---------- */
.toolbar {
display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
padding: 10px 20px; background: var(--panel);
border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.btn {
display: inline-flex; align-items: center; gap: 6px;
height: 34px; padding: 0 12px; border-radius: 8px;
border: 1px solid var(--border); background: var(--panel); color: var(--text);
font-size: 13px; cursor: pointer; transition: all .15s; white-space: nowrap;
}
.btn:hover:not(:disabled) { border-color: var(--border-strong); background: var(--bg); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn svg { width: 15px; height: 15px; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.ghost { border-color: transparent; color: var(--text-muted); }
.btn.ghost:hover { background: var(--bg); color: var(--text); }
.btn.toggle.active { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.divider { width: 1px; height: 22px; background: var(--border); margin: 0 4px; }
.seg {
display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden;
}
.seg button {
height: 34px; padding: 0 11px; border: 0; background: var(--panel);
color: var(--text-muted); font-size: 12.5px; cursor: pointer;
border-right: 1px solid var(--border); transition: all .15s;
}
.seg button:last-child { border-right: 0; }
.seg button:hover { background: var(--bg); color: var(--text); }
.seg button.active { background: var(--accent-soft); color: var(--accent); }
.stat { font-size: 12px; display: inline-flex; align-items: center; gap: 6px; }
.stat.hidden { display: none !important; }
.stat .add { color: var(--c-add); font-weight: 600; }
.stat .del { color: var(--c-del); font-weight: 600; }
.stat .mod { color: #ca8a04; font-weight: 600; }
html.dark .stat .mod { color: #facc15; }
.stat .dot { color: var(--text-faint); }
/* ---------- Main ---------- */
main {
flex: 1; overflow: hidden;
display: flex; flex-direction: column;
padding: 16px 20px 40px; gap: 16px;
}
main.input-only .input-panel { flex: 1; }
main.input-only .diff-panel { display: none; }
main.has-diff .input-panel { flex: 0 0 220px; }
main.has-diff .diff-panel { display: flex; }
/* ---------- 输入区 ---------- */
.input-panel {
display: flex; gap: 14px;
min-height: 220px; transition: flex .2s;
}
.input-col {
flex: 1; display: flex; flex-direction: column;
background: var(--panel);
border: 1px solid var(--border); border-radius: var(--radius);
box-shadow: var(--shadow); overflow: hidden;
}
.input-head {
display: flex; align-items: center; gap: 8px;
padding: 8px 12px; border-bottom: 1px solid var(--border);
background: var(--bg); font-size: 13px; color: var(--text-muted);
}
.input-head .input-title { flex: 1; font-weight: 600; color: var(--text); }
.input-head .icon-btn { width: 28px; height: 28px; border: none; background: transparent; }
.input-col textarea {
flex: 1; width: 100%; min-height: 120px;
border: 0; background: var(--panel); color: var(--text);
padding: 12px; font-family: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
font-size: 13px; line-height: 1.7; resize: none; outline: none;
white-space: pre; overflow: auto;
}
.input-col textarea::placeholder { color: var(--text-faint); }
.input-col textarea.dragover { background: var(--accent-soft); }
/* ---------- Diff 结果区 ---------- */
.diff-panel {
flex: 1; flex-direction: column;
background: var(--panel);
border: 1px solid var(--border); border-radius: var(--radius);
box-shadow: var(--shadow); overflow: hidden;
}
.diff-head {
display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
padding: 10px 14px; border-bottom: 1px solid var(--border);
background: var(--bg); font-size: 13px; color: var(--text-muted);
}
.diff-head .diff-title { font-weight: 600; color: var(--text); }
.diff-head .notice {
display: none; align-items: center; gap: 6px;
padding: 4px 10px; border-radius: 6px;
background: var(--c-change-bg); color: var(--text);
font-size: 12px;
}
.diff-head .notice.show { display: inline-flex; }
.diff-body { flex: 1; overflow: auto; }
/* ---------- 并排视图 ---------- */
.diff-side { min-width: 640px; }
.diff-row {
display: grid;
grid-template-columns: 44px 1fr 44px 1fr;
border-bottom: 1px solid var(--border);
font-family: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
font-size: 13px; line-height: 1.7;
}
.diff-row > * { padding: 4px 8px; border-right: 1px solid var(--border); overflow: hidden; }
.diff-row > *:last-child { border-right: none; }
.ln {
background: var(--bg); color: var(--text-faint);
text-align: right; white-space: nowrap;
user-select: none; font-size: 12px;
}
.lc, .rc { white-space: pre; }
.row-eq { background: var(--panel); }
.row-del { background: var(--c-del-bg); }
.row-add { background: var(--c-add-bg); }
.row-empty { background: var(--bg); }
.del-part { background: var(--c-del-strong); border-radius: 2px; }
.ins-part { background: var(--c-add-strong); border-radius: 2px; }
.empty-line { display: inline-block; min-width: 1px; min-height: 1em; }
/* ---------- 统一视图 ---------- */
.diff-unified {
min-width: 320px;
font-family: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
font-size: 13px; line-height: 1.7;
}
.u-row { display: flex; border-bottom: 1px solid var(--border); }
.u-sign {
width: 34px; text-align: center; font-weight: 700;
background: var(--bg); border-right: 1px solid var(--border);
user-select: none;
}
.u-line { flex: 1; padding: 4px 10px; white-space: pre; overflow: hidden; }
.u-eq { background: var(--panel); }
.u-del { background: var(--c-del-bg); }
.u-add { background: var(--c-add-bg); }
.u-del .u-sign { color: var(--c-del); }
.u-add .u-sign { color: var(--c-add); }
/* ---------- Toast ---------- */
#toast {
position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px);
background: var(--text); color: var(--panel);
padding: 9px 16px; border-radius: 8px; font-size: 13px;
box-shadow: 0 8px 24px rgba(0,0,0,.2);
opacity: 0; pointer-events: none; transition: all .22s;
z-index: 200; display: flex; align-items: center; gap: 7px;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#toast svg { width: 15px; height: 15px; }
.hidden { display: none !important; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 6px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }
@media (max-width: 760px) {
header { padding: 12px 14px; }
.toolbar { padding: 8px 12px; gap: 6px; }
main { padding: 12px 12px 50px; gap: 12px; }
.logo .sub { display: none; }
.input-panel { flex-direction: column; min-height: 320px; }
main.has-diff .input-panel { flex: 0 0 320px; }
.diff-row { grid-template-columns: 30px 1fr 30px 1fr; }
.ln { font-size: 11px; padding: 4px 5px; }
}
</style>
</head>
<body>
<header>
<div class="logo">
<div class="mark">±</div>
<div>
文本差异对比工具
<div class="sub">行级 diff · 字符高亮 · 并排与统一视图</div>
</div>
</div>
<div class="spacer"></div>
<a class="icon-btn" href="https://github.com/wangruofeng/diff-viewer" target="_blank" rel="noopener noreferrer" title="查看 GitHub 源码" aria-label="GitHub 源码仓库">
<svg viewBox="0 0 24 24" fill="currentColor"><path d="M12 .5C5.37.5 0 5.78 0 12.292c0 5.211 3.438 9.63 8.205 11.188.6.111.82-.254.82-.567 0-.28-.01-1.022-.015-2.005-3.338.711-4.042-1.582-4.042-1.582-.546-1.361-1.335-1.725-1.335-1.725-1.087-.731.084-.716.084-.716 1.205.082 1.838 1.215 1.838 1.215 1.07 1.803 2.809 1.282 3.495.981.108-.763.417-1.282.76-1.577-2.665-.295-5.466-1.309-5.466-5.827 0-1.287.465-2.339 1.235-3.164-.135-.297-.54-1.498.105-3.121 0 0 1.005-.316 3.3 1.209.96-.262 1.98-.392 3-.397 1.02.005 2.04.135 3 .397 2.28-1.525 3.285-1.209 3.285-1.209.645 1.623.24 2.824.12 3.121.765.825 1.23 1.877 1.23 3.164 0 4.53-2.805 5.527-5.475 5.817.42.354.81 1.077.81 2.182 0 1.578-.015 2.846-.015 3.229 0 .309.21.678.825.562C20.565 21.917 24 17.495 24 12.292 24 5.78 18.627.5 12 .5z"/></svg>
</a>
<button class="icon-btn" id="themeBtn" title="切换深浅色"></button>
</header>
<div class="toolbar">
<button class="btn" id="sampleBtn">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 2l2.4 7.2h7.6l-6 4.8 2.4 7.2-6-4.8-6 4.8 2.4-7.2-6-4.8h7.6z"/></svg>
示例
</button>
<button class="btn" id="swapBtn">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M7 16V4M7 4L3 8M7 4l4 4"/><path d="M17 8v12m0 0l4-4m-4 4l-4-4"/></svg>
交换
</button>
<button class="btn ghost" id="clearBtn">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="3 6 5 6 21 6"/><path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"/></svg>
清空
</button>
<div class="divider"></div>
<div class="seg" id="viewSeg">
<button data-view="side" class="active">并排</button>
<button data-view="unified">统一</button>
</div>
<div class="divider"></div>
<button class="btn toggle" id="ignoreWSBtn" title="忽略行首行尾空白差异" aria-pressed="false">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="3" y1="6" x2="21" y2="6"/><line x1="3" y1="12" x2="15" y2="12"/><line x1="3" y1="18" x2="18" y2="18"/></svg>
忽略空白
</button>
<button class="btn toggle" id="ignoreCaseBtn" title="忽略大小写差异" aria-pressed="false">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="4 7 4 4 20 4 20 7"/><line x1="9" y1="20" x2="15" y2="20"/><line x1="12" y1="4" x2="12" y2="20"/></svg>
忽略大小写
</button>
<div class="divider"></div>
<button class="btn" id="copyDiffBtn" disabled>
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>
复制差异
</button>
<button class="btn" id="downloadDiffBtn" disabled>
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
下载
</button>
<div class="spacer"></div>
<div class="stat hidden" id="statBar">
<span class="add" id="statAdd">+0 新增</span>
<span class="dot">·</span>
<span class="del" id="statDel">−0 删除</span>
<span class="dot">·</span>
<span class="mod" id="statMod">~0 修改</span>
</div>
</div>
<input type="file" id="leftFile" accept=".txt,text/plain" class="hidden">
<input type="file" id="rightFile" accept=".txt,text/plain" class="hidden">
<main id="main" class="input-only">
<div class="input-panel" id="inputPanel">
<div class="input-col">
<div class="input-head">
<span class="input-title">原文</span>
<button class="icon-btn" id="importLeftBtn" title="导入原文文件" aria-label="导入原文">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="17 8 12 3 7 8"/><line x1="12" y1="3" x2="12" y2="15"/></svg>
</button>
</div>
<textarea id="leftInput" placeholder="在此粘贴原文，或将 .txt 文件拖拽到此处…" spellcheck="false" wrap="off"></textarea>
</div>
<div class="input-col">
<div class="input-head">
<span class="input-title">新文</span>
<button class="icon-btn" id="importRightBtn" title="导入新文文件" aria-label="导入新文">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="17 8 12 3 7 8"/><line x1="12" y1="3" x2="12" y2="15"/></svg>
</button>
</div>
<textarea id="rightInput" placeholder="在此粘贴新文，或将 .txt 文件拖拽到此处…" spellcheck="false" wrap="off"></textarea>
</div>
</div>
<div class="diff-panel" id="diffPanel">
<div class="diff-head">
<span class="diff-title" id="diffTitle">并排对比</span>
<span class="notice" id="degradeNotice">
<svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><line x1="12" y1="8" x2="12" y2="12"/><line x1="12" y1="16" x2="12.01" y2="16"/></svg>
文本较长，已使用前缀/后缀裁剪 + 中段 LCS 进行快速对比，结果可能存在偏差。
</span>
</div>
<div class="diff-body" id="diffBody"></div>
</div>
</main>
<div id="toast"></div>
<script>
/* =========================================================
文本差异对比工具
- 双栏输入：支持粘贴与拖拽 .txt 文件
- 行级 LCS diff，字符级高亮
- 并排 / 统一视图切换
- 忽略空白 / 忽略大小写
- 复制 / 下载 unified diff
========================================================= */
const $ = (s) => document.querySelector(s);
const state = {
left: '',
right: '',
ops: [],
degraded: false,
view: 'side',
ignoreWS: false,
ignoreCase: false,
debounceTimer: null
};
/* ---------- 通用工具 ---------- */
function escapeHtml(s) {
return String(s)
.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>')
.replace(/"/g, '"').replace(/'/g, ''');
}
function splitLines(t) {
if (t === '') return [];
const arr = t.split(/\r?\n/);
if (arr.length && arr[arr.length - 1] === '') arr.pop();
return arr;
}
let toastTimer;
function showToast(msg, ok = true) {
const t = $('#toast');
t.innerHTML = (ok
? '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"/></svg>'
: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><circle cx="12" cy="12" r="10"/><line x1="12" y1="8" x2="12" y2="12"/><line x1="12" y1="16" x2="12.01" y2="16"/></svg>'
) + '<span>' + escapeHtml(msg) + '</span>';
t.classList.add('show');
clearTimeout(toastTimer);
toastTimer = setTimeout(() => t.classList.remove('show'), 1600);
}
async function copyText(text) {
try { await navigator.clipboard.writeText(text); return true; } catch {}
const ta = document.createElement('textarea');
ta.value = text; ta.style.position = 'fixed'; ta.style.opacity = '0';
document.body.appendChild(ta); ta.select();
let ok = false;
try { ok = document.execCommand('copy'); } catch {}
document.body.removeChild(ta);
return ok;
}
function readFile(file, cb) {
const reader = new FileReader();
reader.onload = (ev) => cb(ev.target.result);
reader.onerror = () => showToast('读取文件失败', false);
reader.readAsText(file, 'utf-8');
}
/* ---------- 行级 diff ---------- */
function normalizeLine(s) {
let t = s;
if (state.ignoreWS) t = t.replace(/^\s+|\s+$/g, '');
if (state.ignoreCase) t = t.toLowerCase();
return t;
}
function lcsDiff(a, b, oldOffset = 0, newOffset = 0) {
const n = a.length, m = b.length;
const Arr = m <= 32767 ? Int16Array : Int32Array;
const dp = Array.from({ length: n + 1 }, () => new Arr(m + 1));
for (let i = 1; i <= n; i++) {
const ai = a[i - 1];
for (let j = 1; j <= m; j++) {
dp[i][j] = (normalizeLine(ai) === normalizeLine(b[j - 1]))
? dp[i - 1][j - 1] + 1
: Math.max(dp[i - 1][j], dp[i][j - 1]);
}
}
const rev = [];
let i = n, j = m, oldNum = n + oldOffset, newNum = m + newOffset;
while (i > 0 || j > 0) {
if (i > 0 && j > 0 && normalizeLine(a[i - 1]) === normalizeLine(b[j - 1])) {
rev.push({ type: 'equal', oldLine: a[i - 1], newLine: b[j - 1], oldNum, newNum });
i--; j--; oldNum--; newNum--;
} else if (j > 0 && (i === 0 || dp[i][j - 1] >= dp[i - 1][j])) {
rev.push({ type: 'insert', newLine: b[j - 1], newNum });
j--; newNum--;
} else {
rev.push({ type: 'delete', oldLine: a[i - 1], oldNum });
i--; oldNum--;
}
}
return rev.reverse();
}
function computeLineDiff(oldLines, newLines) {
const LIMIT = 3000;
let degraded = false;
let ops;
if (oldLines.length === 0) {
ops = newLines.map((l, i) => ({ type: 'insert', newLine: l, newNum: i + 1 }));
} else if (newLines.length === 0) {
ops = oldLines.map((l, i) => ({ type: 'delete', oldLine: l, oldNum: i + 1 }));
} else if (oldLines.length + newLines.length > LIMIT) {
degraded = true;
let pre = 0;
const maxPre = Math.min(oldLines.length, newLines.length);
while (pre < maxPre && normalizeLine(oldLines[pre]) === normalizeLine(newLines[pre])) pre++;
let suf = 0;
const maxSuf = Math.min(oldLines.length - pre, newLines.length - pre);
while (suf < maxSuf && normalizeLine(oldLines[oldLines.length - 1 - suf]) === normalizeLine(newLines[newLines.length - 1 - suf])) suf++;
const aMid = oldLines.slice(pre, oldLines.length - suf);
const bMid = newLines.slice(pre, newLines.length - suf);
const midOps = lcsDiff(aMid, bMid, pre, pre);
ops = [];
for (let i = 0; i < pre; i++) {
ops.push({ type: 'equal', oldLine: oldLines[i], newLine: newLines[i], oldNum: i + 1, newNum: i + 1 });
}
ops.push(...midOps);
const oldSufStart = oldLines.length - suf, newSufStart = newLines.length - suf;
for (let i = 0; i < suf; i++) {
ops.push({
type: 'equal',
oldLine: oldLines[oldSufStart + i],
newLine: newLines[newSufStart + i],
oldNum: oldSufStart + i + 1,
newNum: newSufStart + i + 1
});
}
} else {
ops = lcsDiff(oldLines, newLines, 0, 0);
}
// 将连续变更块内的删除与新增按顺序配对为“修改”，剩余的行保持纯删除/新增
const paired = [];
for (let i = 0; i < ops.length;) {
const op = ops[i];
if (op.type === 'equal') { paired.push(op); i++; continue; }
let j = i;
const dels = [], ins = [];
while (j < ops.length && ops[j].type !== 'equal') {
if (ops[j].type === 'delete') dels.push(ops[j]);
else if (ops[j].type === 'insert') ins.push(ops[j]);
j++;
}
const pairCount = Math.min(dels.length, ins.length);
for (let k = 0; k < pairCount; k++) {
paired.push({
type: 'replace',
oldLine: dels[k].oldLine,
newLine: ins[k].newLine,
oldNum: dels[k].oldNum,
newNum: ins[k].newNum
});
}
for (let k = pairCount; k < dels.length; k++) paired.push(dels[k]);
for (let k = pairCount; k < ins.length; k++) paired.push(ins[k]);
i = j;
}
return { ops: paired, degraded };
}
/* ---------- 字符级 diff（行内高亮） ---------- */
function charDiff(oldStr, newStr) {
const a = Array.from(oldStr), b = Array.from(newStr);
const n = a.length, m = b.length;
if (n === 0 && m === 0) return [];
if (n === 0) return [{ type: 'ins', text: newStr }];
if (m === 0) return [{ type: 'del', text: oldStr }];
const Arr = m <= 32767 ? Int16Array : Int32Array;
const dp = Array.from({ length: n + 1 }, () => new Arr(m + 1));
for (let i = 1; i <= n; i++) {
const ai = a[i - 1];
for (let j = 1; j <= m; j++) {
dp[i][j] = (ai === b[j - 1]) ? dp[i - 1][j - 1] + 1 : Math.max(dp[i - 1][j], dp[i][j - 1]);
}
}
const rev = [];
let i = n, j = m;
while (i > 0 || j > 0) {
if (i > 0 && j > 0 && a[i - 1] === b[j - 1]) {
rev.push({ type: 'eq', text: a[i - 1] }); i--; j--;
} else if (j > 0 && (i === 0 || dp[i][j - 1] >= dp[i - 1][j])) {
rev.push({ type: 'ins', text: b[j - 1] }); j--;
} else {
rev.push({ type: 'del', text: a[i - 1] }); i--;
}
}
rev.reverse();
const out = [{ type: rev[0].type, text: rev[0].text }];
for (let k = 1; k < rev.length; k++) {
const last = out[out.length - 1], cur = rev[k];
if (last.type === cur.type) last.text += cur.text;
else out.push({ type: cur.type, text: cur.text });
}
return out;
}
function renderCharDiff(segments, kind) {
return segments.map(seg => {
const t = escapeHtml(seg.text);
if (seg.type === 'eq') return t;
if (seg.type === 'del' && (kind === 'del' || kind === 'both')) return '<span class="del-part">' + t + '</span>';
if (seg.type === 'ins' && (kind === 'ins' || kind === 'both')) return '<span class="ins-part">' + t + '</span>';
return t;
}).join('');
}
/* ---------- 渲染 diff ---------- */
function renderSide(ops) {
return ops.map(op => {
let leftNum = '', rightNum = '', leftClass = 'row-empty', rightClass = 'row-empty';
let leftHtml = '<span class="empty-line"></span>', rightHtml = '<span class="empty-line"></span>';
if (op.type === 'equal') {
leftNum = op.oldNum; rightNum = op.newNum;
leftClass = rightClass = 'row-eq';
leftHtml = rightHtml = escapeHtml(op.oldLine || ' ');
if (!op.oldLine) { leftHtml = rightHtml = '<span class="empty-line"></span>'; }
} else if (op.type === 'delete') {
leftNum = op.oldNum; leftClass = 'row-del';
leftHtml = escapeHtml(op.oldLine || ' ');
if (!op.oldLine) leftHtml = '<span class="empty-line"></span>';
} else if (op.type === 'insert') {
rightNum = op.newNum; rightClass = 'row-add';
rightHtml = escapeHtml(op.newLine || ' ');
if (!op.newLine) rightHtml = '<span class="empty-line"></span>';
} else if (op.type === 'replace') {
leftNum = op.oldNum; rightNum = op.newNum;
leftClass = 'row-del'; rightClass = 'row-add';
const segs = charDiff(op.oldLine, op.newLine);
leftHtml = renderCharDiff(segs, 'del');
rightHtml = renderCharDiff(segs, 'ins');
}
return '<div class="diff-row">' +
'<div class="ln">' + leftNum + '</div>' +
'<div class="lc ' + leftClass + '">' + leftHtml + '</div>' +
'<div class="ln">' + rightNum + '</div>' +
'<div class="rc ' + rightClass + '">' + rightHtml + '</div>' +
'</div>';
}).join('');
}
function renderUnified(ops) {
return ops.map(op => {
if (op.type === 'equal') {
const html = escapeHtml(op.oldLine || '');
return '<div class="u-row u-eq"><span class="u-sign"> </span><span class="u-line">' + html + '</span></div>';
}
if (op.type === 'delete') {
const html = escapeHtml(op.oldLine || '');
return '<div class="u-row u-del"><span class="u-sign">−</span><span class="u-line">' + html + '</span></div>';
}
if (op.type === 'insert') {
const html = escapeHtml(op.newLine || '');
return '<div class="u-row u-add"><span class="u-sign">+</span><span class="u-line">' + html + '</span></div>';
}
// replace
const segs = charDiff(op.oldLine, op.newLine);
const oldHtml = renderCharDiff(segs, 'del');
const newHtml = renderCharDiff(segs, 'ins');
return '<div class="u-row u-del"><span class="u-sign">−</span><span class="u-line">' + oldHtml + '</span></div>' +
'<div class="u-row u-add"><span class="u-sign">+</span><span class="u-line">' + newHtml + '</span></div>';
}).join('');
}
function renderDiff() {
if (state.ops.length === 0) {
$('#main').classList.remove('has-diff');
$('#main').classList.add('input-only');
$('#statBar').classList.add('hidden');
$('#copyDiffBtn').disabled = true;
$('#downloadDiffBtn').disabled = true;
return;
}
$('#main').classList.remove('input-only');
$('#main').classList.add('has-diff');
$('#statBar').classList.remove('hidden');
$('#copyDiffBtn').disabled = false;
$('#downloadDiffBtn').disabled = false;
$('#diffTitle').textContent = state.view === 'side' ? '并排对比' : '统一视图';
$('#degradeNotice').classList.toggle('show', state.degraded);
$('#diffBody').innerHTML = state.view === 'side'
? '<div class="diff-side">' + renderSide(state.ops) + '</div>'
: '<div class="diff-unified">' + renderUnified(state.ops) + '</div>';
}
/* ---------- 统计 ---------- */
function updateStats() {
const s = state.ops.reduce((acc, op) => {
if (op.type === 'insert') acc.added++;
else if (op.type === 'delete') acc.deleted++;
else if (op.type === 'replace') acc.modified++;
return acc;
}, { added: 0, deleted: 0, modified: 0 });
$('#statAdd').textContent = '+' + s.added + ' 新增';
$('#statDel').textContent = '−' + s.deleted + ' 删除';
$('#statMod').textContent = '~' + s.modified + ' 修改';
}
/* ---------- 对比调度 ---------- */
function runDiff() {
state.left = $('#leftInput').value;
state.right = $('#rightInput').value;
if (!state.left && !state.right) {
state.ops = [];
state.degraded = false;
renderDiff();
return;
}
const oldLines = splitLines(state.left);
const newLines = splitLines(state.right);
const res = computeLineDiff(oldLines, newLines);
state.ops = res.ops;
state.degraded = res.degraded;
updateStats();
renderDiff();
}
function scheduleDiff() {
clearTimeout(state.debounceTimer);
state.debounceTimer = setTimeout(runDiff, 250);
}
/* ---------- unified diff 文本生成 ---------- */
function buildUnifiedDiffText() {
if (state.ops.length === 0) return '';
const lines = ['--- 原文', '+++ 新文', ''];
const change = state.ops.map(op => op.type !== 'equal');
const n = state.ops.length;
const CTX = 3;
let i = 0;
while (i < n) {
while (i < n && !change[i]) i++;
if (i >= n) break;
let start = Math.max(0, i - CTX);
let end = Math.min(n - 1, i + CTX);
// 合并相邻的变更块
while (true) {
let next = end + 1;
while (next < n && !change[next]) next++;
if (next < n && next - end <= 2 * CTX) {
end = Math.min(n - 1, next + CTX);
i = next;
} else break;
}
// 计算块内行号与长度
let oldStart = 0, newStart = 0, oldLen = 0, newLen = 0;
for (let k = start; k <= end; k++) {
const op = state.ops[k];
if (k === start) {
if (op.type === 'equal' || op.type === 'delete' || op.type === 'replace') oldStart = op.oldNum;
else if (op.type === 'insert') oldStart = op.newNum - 1;
if (op.type === 'equal' || op.type === 'insert' || op.type === 'replace') newStart = op.newNum;
else if (op.type === 'delete') newStart = op.oldNum - 1;
}
if (op.type === 'equal') { oldLen++; newLen++; }
else if (op.type === 'delete') { oldLen++; }
else if (op.type === 'insert') { newLen++; }
else if (op.type === 'replace') { oldLen++; newLen++; }
}
lines.push('@@ -' + oldStart + ',' + oldLen + ' +' + newStart + ',' + newLen + ' @@');
for (let k = start; k <= end; k++) {
const op = state.ops[k];
if (op.type === 'equal') lines.push(' ' + op.oldLine);
else if (op.type === 'delete') lines.push('-' + op.oldLine);
else if (op.type === 'insert') lines.push('+' + op.newLine);
else if (op.type === 'replace') { lines.push('-' + op.oldLine); lines.push('+' + op.newLine); }
}
lines.push('');
i = end + 1;
}
return lines.join('\n');
}
/* ---------- 文件拖拽 ---------- */
function setupDrop(textarea) {
let counter = 0;
textarea.addEventListener('dragenter', (e) => {
e.preventDefault(); counter++;
textarea.classList.add('dragover');
});
textarea.addEventListener('dragover', (e) => e.preventDefault());
textarea.addEventListener('dragleave', (e) => {
e.preventDefault(); counter--;
if (counter <= 0) { counter = 0; textarea.classList.remove('dragover'); }
});
textarea.addEventListener('drop', (e) => {
e.preventDefault(); counter = 0;
textarea.classList.remove('dragover');
const file = e.dataTransfer.files[0];
if (!file) return;
readFile(file, (text) => {
textarea.value = text;
showToast('已导入：' + file.name);
scheduleDiff();
});
});
}
function setupFileInput(input, textarea) {
input.addEventListener('change', (e) => {
const file = e.target.files[0];
if (file) {
readFile(file, (text) => {
textarea.value = text;
showToast('已导入：' + file.name);
scheduleDiff();
});
}
input.value = '';
});
}
setupDrop($('#leftInput'));
setupDrop($('#rightInput'));
setupFileInput($('#leftFile'), $('#leftInput'));
setupFileInput($('#rightFile'), $('#rightInput'));
$('#importLeftBtn').addEventListener('click', () => $('#leftFile').click());
$('#importRightBtn').addEventListener('click', () => $('#rightFile').click());
/* ---------- 工具栏事件 ---------- */
$('#leftInput').addEventListener('input', scheduleDiff);
$('#rightInput').addEventListener('input', scheduleDiff);
$('#sampleBtn').addEventListener('click', () => {
const left = '项目配置 v1.0\n名称：Alpha 系统\n端口：8080\n调试模式：false\n允许注册：true\n管理员：\n- 张三\n- 李四\n日志级别：info';
const right = '项目配置 v1.1\n名称：Alpha 系统 Pro\n端口：3000\n调试模式：true\n允许注册：true\n管理员：\n- 张三\n- 王五\n- 赵六\n日志级别：debug\n新增：缓存 TTL 60s';
$('#leftInput').value = left;
$('#rightInput').value = right;
scheduleDiff();
showToast('已填充示例');
});
$('#swapBtn').addEventListener('click', () => {
const t = $('#leftInput').value;
$('#leftInput').value = $('#rightInput').value;
$('#rightInput').value = t;
scheduleDiff();
showToast('已交换左右文本');
});
$('#clearBtn').addEventListener('click', () => {
$('#leftInput').value = '';
$('#rightInput').value = '';
scheduleDiff();
showToast('已清空');
});
function setView(view) {
state.view = view;
document.querySelectorAll('#viewSeg button').forEach(b => b.classList.toggle('active', b.dataset.view === view));
renderDiff();
}
document.querySelectorAll('#viewSeg button').forEach(b => {
b.addEventListener('click', () => setView(b.dataset.view));
});
function toggleBtn(id, key) {
const btn = $(id);
btn.addEventListener('click', () => {
state[key] = !state[key];
btn.classList.toggle('active', state[key]);
btn.setAttribute('aria-pressed', String(state[key]));
scheduleDiff();
});
}
toggleBtn('#ignoreWSBtn', 'ignoreWS');
toggleBtn('#ignoreCaseBtn', 'ignoreCase');
$('#copyDiffBtn').addEventListener('click', async () => {
const text = buildUnifiedDiffText();
if (!text) return;
if (await copyText(text)) showToast('已复制 unified diff');
else showToast('复制失败', false);
});
$('#downloadDiffBtn').addEventListener('click', () => {
const text = buildUnifiedDiffText();
if (!text) return;
const blob = new Blob([text], { type: 'text/x-diff;charset=utf-8' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url; a.download = 'diff.diff';
document.body.appendChild(a); a.click(); document.body.removeChild(a);
setTimeout(() => URL.revokeObjectURL(url), 1000);
showToast('已下载 diff.diff');
});
/* ---------- 主题切换 ---------- */
const themeBtn = $('#themeBtn');
const SUN = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg>';
const MOON = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/></svg>';
function setTheme(dark) {
document.documentElement.classList.toggle('dark', dark);
themeBtn.innerHTML = dark ? SUN : MOON;
themeBtn.title = dark ? '切换到浅色' : '切换到深色';
try { localStorage.setItem('diff-theme', dark ? 'dark' : 'light'); } catch {}
}
themeBtn.addEventListener('click', () => setTheme(!document.documentElement.classList.contains('dark')));
try {
const saved = localStorage.getItem('diff-theme');
const prefersDark = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
setTheme(saved ? saved === 'dark' : prefersDark);
} catch { setTheme(false); }
</script>
</body>
</html>