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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>Agent 循环可视化 · 看懂 ReAct</title>
<style>
:root {
--bg: #f5f7fa;
--card: #ffffff;
--text: #1a1a1a;
--muted: #6b7280;
--border: #e5e7eb;
--primary: #3b82f6;
--primary-dark: #2563eb;
--think: #f59e0b;
--act: #10b981;
--obs: #8b5cf6;
--decide: #ec4899;
--done: #059669;
--code-bg: #f3f4f6;
--shadow: 0 1px 3px rgba(0,0,0,0.05), 0 4px 12px rgba(0,0,0,0.04);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
background: var(--bg);
color: var(--text);
line-height: 1.6;
padding: 20px 16px;
-webkit-font-smoothing: antialiased;
}
.container { max-width: 920px; margin: 0 auto; }
/* Header */
.header {
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
color: white;
padding: 28px 28px 24px;
border-radius: 16px;
margin-bottom: 18px;
box-shadow: var(--shadow);
}
.header h1 { font-size: 24px; font-weight: 600; margin-bottom: 6px; }
.header p { opacity: 0.92; font-size: 14px; }
.header .nav { margin-top: 12px; font-size: 12px; }
.header .nav a { color: #fff; opacity: 0.85; text-decoration: underline; }
/* Controls */
.controls {
display: flex;
flex-wrap: wrap;
gap: 10px;
align-items: center;
padding: 14px 16px;
background: var(--card);
border-radius: 12px;
margin-bottom: 16px;
border: 1px solid var(--border);
box-shadow: var(--shadow);
}
.controls select {
padding: 7px 12px;
border: 1px solid var(--border);
border-radius: 8px;
font-size: 14px;
background: white;
cursor: pointer;
flex: 1;
min-width: 180px;
}
.btn {
padding: 7px 14px;
border: none;
border-radius: 8px;
cursor: pointer;
font-size: 14px;
font-weight: 500;
background: var(--primary);
color: white;
transition: all 0.15s;
}
.btn:hover:not(:disabled) { background: var(--primary-dark); transform: translateY(-1px); }
.btn.secondary { background: #e5e7eb; color: var(--text); }
.btn.secondary:hover:not(:disabled) { background: #d1d5db; }
.speed-wrap { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); margin-left: auto; }
.speed-wrap input { width: 80px; }
/* Main 2-column layout */
.main {
display: grid;
grid-template-columns: 1fr 1.2fr;
gap: 16px;
}
@media (max-width: 760px) {
.main { grid-template-columns: 1fr; }
}
/* Loop diagram */
.loop-panel {
background: var(--card);
padding: 24px 16px;
border-radius: 12px;
border: 1px solid var(--border);
box-shadow: var(--shadow);
position: relative;
}
.loop-panel-title {
font-size: 12px;
color: var(--muted);
font-weight: 600;
letter-spacing: 0.5px;
text-transform: uppercase;
text-align: center;
margin-bottom: 16px;
}
.loop {
display: flex;
flex-direction: column;
align-items: center;
gap: 0;
}
.step-box {
width: 200px;
padding: 16px 20px;
border: 2px solid var(--border);
border-radius: 12px;
background: white;
text-align: center;
transition: all 0.4s ease;
position: relative;
}
.step-box.active {
transform: scale(1.06);
box-shadow: 0 0 0 6px rgba(59, 130, 246, 0.12), 0 8px 24px rgba(0,0,0,0.08);
}
.step-box .icon { font-size: 24px; margin-bottom: 4px; }
.step-box .name { font-weight: 600; font-size: 15px; margin-bottom: 2px; }
.step-box .desc { font-size: 12px; color: var(--muted); }
.step-box.think.active { border-color: var(--think); }
.step-box.think.active .name { color: var(--think); }
.step-box.act.active { border-color: var(--act); }
.step-box.act.active .name { color: var(--act); }
.step-box.obs.active { border-color: var(--obs); }
.step-box.obs.active .name { color: var(--obs); }
.step-box.decide.active { border-color: var(--decide); }
.step-box.decide.active .name { color: var(--decide); }
.step-box.done.active { border-color: var(--done); background: #ecfdf5; }
.step-box.done.active .name { color: var(--done); }
.arrow {
height: 28px;
width: 2px;
background: var(--border);
position: relative;
}
.arrow.active { background: var(--primary); }
.arrow::after {
content: '▼';
position: absolute;
bottom: -6px;
left: 50%;
transform: translateX(-50%);
color: var(--border);
font-size: 10px;
}
.arrow.active::after { color: var(--primary); }
.loop-back {
margin-top: 8px;
padding: 8px 12px;
background: #fffbeb;
border: 1px dashed #fbbf24;
border-radius: 8px;
font-size: 12px;
color: #92400e;
opacity: 0;
transition: opacity 0.3s;
}
.loop-back.show { opacity: 1; }
/* Messages */
.msg-panel {
background: var(--card);
padding: 20px;
border-radius: 12px;
border: 1px solid var(--border);
box-shadow: var(--shadow);
display: flex;
flex-direction: column;
min-height: 460px;
}
.msg-panel-title {
font-size: 12px;
color: var(--muted);
font-weight: 600;
letter-spacing: 0.5px;
text-transform: uppercase;
margin-bottom: 12px;
}
.msg-list {
flex: 1;
overflow-y: auto;
display: flex;
flex-direction: column;
gap: 10px;
max-height: 480px;
}
.msg {
padding: 10px 14px;
border-radius: 10px;
font-size: 13px;
line-height: 1.5;
opacity: 0;
transform: translateY(6px);
transition: opacity 0.3s ease, transform 0.3s ease;
border-left: 3px solid transparent;
}
.msg.show { opacity: 1; transform: translateY(0); }
.msg .role {
font-size: 10px;
font-weight: 700;
letter-spacing: 0.5px;
text-transform: uppercase;
margin-bottom: 2px;
color: var(--muted);
}
.msg.user { background: #eff6ff; border-left-color: var(--primary); }
.msg.user .role { color: var(--primary); }
.msg.think { background: #fffbeb; border-left-color: var(--think); }
.msg.think .role { color: var(--think); }
.msg.act { background: #ecfdf5; border-left-color: var(--act); }
.msg.act .role { color: var(--act); }
.msg.act .body { font-family: 'SF Mono', 'Menlo', 'Consolas', monospace; font-size: 12px; }
.msg.obs { background: #f5f3ff; border-left-color: var(--obs); }
.msg.obs .role { color: var(--obs); }
.msg.obs .body { color: var(--muted); }
.msg.decide { background: #fdf2f8; border-left-color: var(--decide); }
.msg.decide .role { color: var(--decide); }
.msg.done { background: #ecfdf5; border-left-color: var(--done); }
.msg.done .role { color: var(--done); }
.msg.done .body { font-weight: 500; }
/* Footer takeaway */
.takeaway {
margin-top: 20px;
padding: 20px 24px;
background: linear-gradient(135deg, #10b981 0%, #059669 100%);
color: white;
border-radius: 12px;
box-shadow: var(--shadow);
opacity: 0;
transform: translateY(10px);
transition: opacity 0.5s ease, transform 0.5s ease;
}
.takeaway.show { opacity: 1; transform: translateY(0); }
.takeaway h3 { font-size: 16px; margin-bottom: 8px; }
.takeaway p { font-size: 14px; opacity: 0.95; }
.progress-track {
width: 100%;
height: 3px;
background: var(--border);
border-radius: 2px;
margin-bottom: 14px;
overflow: hidden;
}
.progress-bar {
height: 100%;
background: var(--primary);
width: 0%;
transition: width 0.3s ease;
}
/* Round counter */
.round-badge {
position: absolute;
top: 16px;
right: 16px;
padding: 4px 10px;
background: var(--code-bg);
border-radius: 6px;
font-size: 12px;
color: var(--muted);
font-weight: 600;
}
</style>
</head>
<body>
<div class="container">
<div class="header">
<h1>🔄 Agent 循环可视化</h1>
<p>看清楚 Agent 内部的「思考 → 行动 → 观察」是怎么转的</p>
<div class="nav">
← <a href="./">查看复杂任务版（苏州旅游）</a>
</div>
</div>
<div class="controls">
<select id="taskSelect">
<option value="weather">📍 比天气：北京 vs 上海 哪个更冷</option>
<option value="math">🧮 算账：买这些东西总共多少钱</option>
<option value="search">🔍 查找：苹果创始人是谁，他多少岁创立的</option>
<option value="compare">⚖️ 对比：iPhone 和华为 Mate 哪个更便宜</option>
</select>
<button class="btn" id="playBtn">▶ 自动播放</button>
<button class="btn secondary" id="stepBtn">→ 单步</button>
<button class="btn secondary" id="resetBtn">↻ 重置</button>
<div class="speed-wrap">
<span>速度</span>
<input type="range" id="speed" min="0.5" max="3" step="0.5" value="1.5">
<span id="speedLabel">1.5x</span>
</div>
</div>
<div class="progress-track"><div class="progress-bar" id="progress"></div></div>
<div class="main">
<div class="loop-panel">
<div class="round-badge" id="roundBadge">Round 0</div>
<div class="loop-panel-title">Agent 内部循环</div>
<div class="loop">
<div class="step-box think" id="box-think">
<div class="icon">💭</div>
<div class="name">思考</div>
<div class="desc">LLM 决定下一步做什么</div>
</div>
<div class="arrow" id="arrow-1"></div>
<div class="step-box act" id="box-act">
<div class="icon">🔧</div>
<div class="name">行动</div>
<div class="desc">调用某个工具</div>
</div>
<div class="arrow" id="arrow-2"></div>
<div class="step-box obs" id="box-obs">
<div class="icon">📥</div>
<div class="name">观察</div>
<div class="desc">看工具返回什么</div>
</div>
<div class="arrow" id="arrow-3"></div>
<div class="step-box decide" id="box-decide">
<div class="icon">❓</div>
<div class="name">完成了吗</div>
<div class="desc">还要继续 / 可以结束</div>
</div>
<div class="loop-back" id="loopBack">↑ 还没完成 → 回到「思考」继续下一轮</div>
</div>
</div>
<div class="msg-panel">
<div class="msg-panel-title">📨 内部消息流</div>
<div class="msg-list" id="msgList"></div>
</div>
</div>
<div class="takeaway" id="takeaway">
<h3>💡 看清楚了吗？</h3>
<p>Agent 的核心 = 一个 <strong>无限循环</strong>：思考 → 行动 → 观察 → 判断完成。<br/>
每一轮都是 LLM 自己决定调什么工具，不是事先安排的。<br/>
<strong>所有复杂的 AI 产品（Claude Code、Cursor、Manus），本质都是这个 4 步循环外面包了无数层。</strong></p>
</div>
</div>
<script>
// ════════════════════════════════════════════════════════════════
// 任务数据：4 个示例
// ════════════════════════════════════════════════════════════════
const TASKS = {
weather: {
user: '北京和上海哪个城市今天更冷？',
steps: [
{ round: 1, stage: 'think', text: '要比较温度，得先查北京' },
{ round: 1, stage: 'act', text: 'get_weather("北京")' },
{ round: 1, stage: 'obs', text: '北京 3°C，晴' },
{ round: 1, stage: 'decide', text: '只查了一个，还没法比，继续' },
{ round: 2, stage: 'think', text: '现在查上海' },
{ round: 2, stage: 'act', text: 'get_weather("上海")' },
{ round: 2, stage: 'obs', text: '上海 12°C，多云' },
{ round: 2, stage: 'decide', text: '数据齐了，可以回答' },
{ round: 3, stage: 'done', text: '北京更冷（3°C），比上海低 9°C' }
]
},
math: {
user: '我买了 3 个 ¥15 的杯子和 2 本 ¥45 的书，一共多少钱？',
steps: [
{ round: 1, stage: 'think', text: '先算杯子的总价' },
{ round: 1, stage: 'act', text: 'calculator("3 * 15")' },
{ round: 1, stage: 'obs', text: '= 45' },
{ round: 1, stage: 'decide', text: '杯子算完了，再算书' },
{ round: 2, stage: 'think', text: '算书的总价' },
{ round: 2, stage: 'act', text: 'calculator("2 * 45")' },
{ round: 2, stage: 'obs', text: '= 90' },
{ round: 2, stage: 'decide', text: '加起来就行了' },
{ round: 3, stage: 'think', text: '把两个加起来' },
{ round: 3, stage: 'act', text: 'calculator("45 + 90")' },
{ round: 3, stage: 'obs', text: '= 135' },
{ round: 3, stage: 'decide', text: '搞定，可以回答' },
{ round: 4, stage: 'done', text: '总共 ¥135（杯子 45 + 书 90）' }
]
},
search: {
user: '苹果公司的创始人是谁？他创立苹果时多少岁？',
steps: [
{ round: 1, stage: 'think', text: '先搜苹果创始人是谁' },
{ round: 1, stage: 'act', text: 'web_search("苹果公司 创始人")' },
{ round: 1, stage: 'obs', text: '史蒂夫·乔布斯, 1976 年创立' },
{ round: 1, stage: 'decide', text: '知道是乔布斯了，还要算他的年龄' },
{ round: 2, stage: 'think', text: '查乔布斯的生日' },
{ round: 2, stage: 'act', text: 'web_search("乔布斯 出生年份")' },
{ round: 2, stage: 'obs', text: '1955 年 2 月 24 日生' },
{ round: 2, stage: 'decide', text: '可以算年龄了' },
{ round: 3, stage: 'think', text: '1976 - 1955 = 21' },
{ round: 3, stage: 'act', text: 'calculator("1976 - 1955")' },
{ round: 3, stage: 'obs', text: '= 21' },
{ round: 3, stage: 'decide', text: '数据齐了' },
{ round: 4, stage: 'done', text: '苹果由史蒂夫·乔布斯创立，他创立时 21 岁（1976 年）' }
]
},
compare: {
user: 'iPhone 15 和华为 Mate 60 哪个更便宜？',
steps: [
{ round: 1, stage: 'think', text: '同时查两款手机的价格（并行）' },
{ round: 1, stage: 'act', text: 'get_price("iPhone 15") + get_price("华为 Mate 60")' },
{ round: 1, stage: 'obs', text: 'iPhone 15: ¥5,999 / Mate 60: ¥5,499' },
{ round: 1, stage: 'decide', text: '一轮就够了，直接给答案' },
{ round: 2, stage: 'done', text: '华为 Mate 60 更便宜 ¥500（5499 vs 5999）' }
]
}
};
// ════════════════════════════════════════════════════════════════
// 状态 + 渲染
// ════════════════════════════════════════════════════════════════
const $ = id => document.getElementById(id);
const STAGES = ['think', 'act', 'obs', 'decide', 'done'];
const STAGE_LABELS = { think: 'REASON 思考', act: 'ACT 行动', obs: 'OBSERVE 观察', decide: 'DECIDE 判断', done: 'DONE 完成', user: 'USER 提问' };
let currentTask = 'weather';
let queue = [];
let position = 0;
let playing = false;
let lastRound = 0;
const taskSelect = $('taskSelect');
const playBtn = $('playBtn');
const stepBtn = $('stepBtn');
const resetBtn = $('resetBtn');
const speed = $('speed');
const speedLabel = $('speedLabel');
const progress = $('progress');
const roundBadge = $('roundBadge');
const msgList = $('msgList');
const loopBack = $('loopBack');
const takeaway = $('takeaway');
function getSpeed() { return parseFloat(speed.value); }
function delay(ms) { return new Promise(r => setTimeout(r, ms / getSpeed())); }
function clearLoopHighlight() {
['think','act','obs','decide'].forEach(s => {
const el = $(`box-${s}`);
if (el) el.classList.remove('active');
});
['arrow-1','arrow-2','arrow-3'].forEach(a => {
const el = $(a);
if (el) el.classList.remove('active');
});
loopBack.classList.remove('show');
}
function highlightStage(stage) {
clearLoopHighlight();
// 'done' / 'user' don't have corresponding loop boxes — handle gracefully
const el = $(`box-${stage}`);
if (el) el.classList.add('active');
// light up arrows leading TO this box
const arrowMap = { act: 'arrow-1', obs: 'arrow-2', decide: 'arrow-3' };
if (arrowMap[stage]) $(arrowMap[stage]).classList.add('active');
}
function reset() {
playing = false;
position = 0;
lastRound = 0;
playBtn.textContent = '▶ 自动播放';
msgList.innerHTML = '';
progress.style.width = '0%';
roundBadge.textContent = 'Round 0';
takeaway.classList.remove('show');
clearLoopHighlight();
// Build queue from current task
const task = TASKS[currentTask];
queue = [
{ stage: 'user', text: task.user },
...task.steps
];
// Show user message immediately
addMsg('user', task.user);
position = 1;
}
function addMsg(stage, text, round) {
const div = document.createElement('div');
div.className = `msg ${stage}`;
const label = STAGE_LABELS[stage] + (round ? ` · R${round}` : '');
div.innerHTML = `
<div class="role">${label}</div>
<div class="body">${escapeHtml(text)}</div>
`;
msgList.appendChild(div);
requestAnimationFrame(() => div.classList.add('show'));
msgList.scrollTop = msgList.scrollHeight;
}
function escapeHtml(s) {
return String(s).replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
}
async function advance() {
if (position >= queue.length) {
playing = false;
playBtn.textContent = '✓ 完成';
takeaway.classList.add('show');
progress.style.width = '100%';
return;
}
const ev = queue[position++];
if (ev.round && ev.round !== lastRound) {
lastRound = ev.round;
roundBadge.textContent = `Round ${ev.round}`;
}
highlightStage(ev.stage);
addMsg(ev.stage, ev.text, ev.round);
// Show "loop back" hint when decide is "still going"
if (ev.stage === 'decide' && position < queue.length) {
setTimeout(() => loopBack.classList.add('show'), 400);
}
progress.style.width = `${(position / queue.length) * 100}%`;
if (playing) {
await delay(1200);
advance();
}
}
function play() {
if (position >= queue.length) reset();
playing = true;
playBtn.textContent = '⏸ 暂停';
advance();
}
function pause() {
playing = false;
playBtn.textContent = position >= queue.length ? '✓ 完成' : '▶ 继续';
}
playBtn.onclick = () => { playing ? pause() : play(); };
stepBtn.onclick = () => { playing = false; playBtn.textContent = '▶ 继续'; advance(); };
resetBtn.onclick = () => reset();
speed.oninput = () => { speedLabel.textContent = getSpeed() + 'x'; };
taskSelect.onchange = () => {
currentTask = taskSelect.value;
reset();
};
// Init
reset();
</script>
</body>
</html>