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675 lines (605 loc) · 23.9 KB
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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">
<meta name="description" content="免费在线二维码识别器，支持上传图片、拖拽、剪贴板粘贴和摄像头扫码。">
<meta name="keywords" content="二维码, QR码, 二维码识别, 二维码扫描, 摄像头扫码, QR Code Decoder">
<meta name="author" content="Simon Willison">
<meta name="date" content="2026-06-22">
<title>二维码识别器</title>
<script src="https://cdn.jsdelivr.net/npm/jsqr@1.4.0/dist/jsQR.min.js"></script>
<style>
* {
box-sizing: border-box;
}
body {
font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
line-height: 1.5;
}
h1 {
margin-top: 0;
}
/* Mode toggle buttons */
.mode-toggle {
display: flex;
gap: 10px;
margin-bottom: 20px;
}
.mode-btn {
flex: 1;
padding: 12px 20px;
border: 2px solid #666;
background: white;
border-radius: 8px;
font-size: 16px;
font-weight: bold;
cursor: pointer;
transition: all 0.2s;
}
.mode-btn:hover {
border-color: #333;
background: #f5f5f5;
}
.mode-btn.active {
background: #007bff;
border-color: #007bff;
color: white;
}
/* Drop area */
#dropArea {
border: 3px dashed #666;
border-radius: 12px;
width: 100%;
min-height: 200px;
margin: 0 auto 20px;
padding: 20px;
text-align: center;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
cursor: pointer;
transition: border-color 0.2s, background-color 0.2s;
}
#dropArea:hover {
border-color: #333;
background-color: rgba(0, 0, 0, 0.05);
}
#dropArea.highlight {
border-color: #0066cc;
background-color: rgba(0, 102, 204, 0.1);
}
.dropzone-text {
font-size: 18px;
color: #444;
}
.dropzone-hint {
font-size: 14px;
color: #888;
margin-top: 8px;
}
#fileElem {
display: none;
}
/* Webcam container */
.webcam-container {
display: none;
width: 100%;
margin-bottom: 20px;
}
.webcam-container.active {
display: block;
}
.video-wrapper {
position: relative;
overflow: hidden;
border-radius: 8px;
background: #000;
touch-action: none;
max-height: 400px;
}
#webcam-video {
width: 100%;
max-height: 400px;
display: block;
background: #000;
object-fit: cover;
transform-origin: center center;
transition: transform 0.05s ease-out;
}
.zoom-hint {
position: absolute;
bottom: 10px;
left: 50%;
transform: translateX(-50%);
background: rgba(0, 0, 0, 0.6);
color: white;
padding: 4px 10px;
border-radius: 4px;
font-size: 12px;
pointer-events: none;
opacity: 0;
transition: opacity 0.3s;
}
.video-wrapper:active .zoom-hint {
opacity: 1;
}
.webcam-placeholder {
width: 100%;
height: 300px;
background: #f0f0f0;
border-radius: 8px;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
color: #666;
}
.webcam-placeholder-icon {
font-size: 48px;
margin-bottom: 10px;
}
/* Webcam controls */
.webcam-bottom-controls {
display: none;
}
.webcam-bottom-controls.active {
display: block;
}
.webcam-controls {
display: flex;
gap: 10px;
margin-top: 10px;
flex-wrap: wrap;
}
.webcam-btn {
padding: 10px 16px;
border: none;
border-radius: 6px;
font-size: 14px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.2s;
}
.webcam-btn.start {
background: #28a745;
color: white;
}
.webcam-btn.start:hover {
background: #218838;
}
.webcam-btn.stop {
background: #dc3545;
color: white;
}
.webcam-btn.stop:hover {
background: #c82333;
}
.webcam-btn.switch {
background: #6c757d;
color: white;
}
.webcam-btn.switch:hover {
background: #5a6268;
}
.webcam-btn:disabled {
opacity: 0.5;
cursor: not-allowed;
}
.webcam-status {
text-align: center;
padding: 10px;
font-size: 14px;
color: #666;
}
/* Result area */
#result {
margin-top: 20px;
padding: 16px;
border: 1px solid #ccc;
border-radius: 5px;
white-space: pre-wrap;
word-break: break-word;
line-height: 1.5;
}
#result:empty {
display: none;
}
#result a {
color: #0066cc;
}
.copy-result-btn {
margin-top: 10px;
padding: 8px 16px;
border: 1px solid #007bff;
background: #fff;
color: #007bff;
border-radius: 5px;
cursor: pointer;
font-size: 14px;
transition: all 0.2s;
}
.copy-result-btn:hover {
background: #007bff;
color: #fff;
}
.copy-result-btn.copied {
background: #28a745;
border-color: #28a745;
color: #fff;
}
</style>
</head>
<body>
<h1>二维码识别</h1>
<p>基于 <a href="https://github.com/cozmo/jsQR/">jsQR</a> 实现，纯前端识别，图片不会上传到服务器。</p>
<div class="mode-toggle">
<button class="mode-btn active" id="image-mode-btn">图片识别</button>
<button class="mode-btn" id="webcam-mode-btn">摄像头识别</button>
</div>
<div id="dropArea">
<input type="file" id="fileElem" accept="image/*">
<div class="dropzone-text">拖拽图片到此处，或点击选择文件</div>
<div class="dropzone-hint">也支持从剪贴板粘贴图片（Ctrl/Cmd + V）</div>
</div>
<div class="webcam-container" id="webcam-container">
<div class="webcam-placeholder" id="webcam-placeholder">
<div class="webcam-placeholder-icon">📹</div>
<div>点击“开启摄像头”开始扫码</div>
</div>
<div class="video-wrapper" id="video-wrapper" style="display: none;">
<video id="webcam-video" autoplay playsinline></video>
<div class="zoom-hint" id="zoom-hint">双指捏合缩放</div>
</div>
</div>
<div id="result"></div>
<button type="button" id="copy-result-btn" class="copy-result-btn" style="display: none;">复制识别结果</button>
<div class="webcam-bottom-controls" id="webcam-bottom-controls">
<div class="webcam-controls">
<button class="webcam-btn start" id="start-camera-btn">开启摄像头</button>
<button class="webcam-btn stop" id="stop-camera-btn" style="display: none;">关闭摄像头</button>
<button class="webcam-btn switch" id="switch-camera-btn" style="display: none;">切换摄像头</button>
</div>
<div class="webcam-status" id="webcam-status"></div>
</div>
<script>
// Ensure jsQR is loaded before proceeding
window.onload = function() {
if (typeof jsQR === 'undefined') {
document.getElementById('result').innerHTML = "错误：QR 码识别库加载失败，请检查网络连接后刷新页面。";
return;
}
const dropArea = document.getElementById('dropArea');
const fileElem = document.getElementById('fileElem');
const result = document.getElementById('result');
const copyResultBtn = document.getElementById('copy-result-btn');
let currentResult = '';
// Mode toggle elements
const imageModeBtn = document.getElementById('image-mode-btn');
const webcamModeBtn = document.getElementById('webcam-mode-btn');
const webcamContainer = document.getElementById('webcam-container');
const webcamBottomControls = document.getElementById('webcam-bottom-controls');
// Webcam elements
const webcamVideo = document.getElementById('webcam-video');
const webcamPlaceholder = document.getElementById('webcam-placeholder');
const videoWrapper = document.getElementById('video-wrapper');
const zoomHint = document.getElementById('zoom-hint');
const startCameraBtn = document.getElementById('start-camera-btn');
const stopCameraBtn = document.getElementById('stop-camera-btn');
const switchCameraBtn = document.getElementById('switch-camera-btn');
const webcamStatus = document.getElementById('webcam-status');
let currentMode = 'image';
let webcamStream = null;
let scanInterval = null;
let currentFacingMode = 'environment';
let hasMultipleCameras = false;
// Pinch-to-zoom state
let currentScale = 1;
let initialDistance = null;
let initialScale = 1;
// --- Image mode handlers (existing functionality) ---
['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
dropArea.addEventListener(eventName, preventDefaults, false);
});
function preventDefaults(e) {
e.preventDefault();
e.stopPropagation();
}
['dragenter', 'dragover'].forEach(eventName => {
dropArea.addEventListener(eventName, highlight, false);
});
['dragleave', 'drop'].forEach(eventName => {
dropArea.addEventListener(eventName, unhighlight, false);
});
function highlight(e) {
dropArea.classList.add('highlight');
}
function unhighlight(e) {
dropArea.classList.remove('highlight');
}
dropArea.addEventListener('click', () => fileElem.click());
dropArea.addEventListener('drop', handleDrop, false);
fileElem.addEventListener('change', handleFiles, false);
document.addEventListener('paste', handlePaste, false);
function handleDrop(e) {
const dt = e.dataTransfer;
const files = dt.files;
handleFiles(files);
}
function handleFiles(files) {
const file = files instanceof FileList ? files[0] : this.files[0];
if (file) {
decodeQR(file);
}
}
function handlePaste(e) {
const items = e.clipboardData.items;
for (let i = 0; i < items.length; i++) {
if (items[i].type.indexOf('image') !== -1) {
const blob = items[i].getAsFile();
decodeQR(blob);
break;
}
}
}
function decodeQR(file) {
const reader = new FileReader();
reader.onload = function(e) {
const img = new Image();
img.onload = function() {
const canvas = document.createElement('canvas');
const context = canvas.getContext('2d');
canvas.width = img.width;
canvas.height = img.height;
context.drawImage(img, 0, 0, img.width, img.height);
const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
const code = jsQR(imageData.data, imageData.width, imageData.height);
if (code) {
const decoded = decodeQRData(code);
displayResult(decoded);
} else {
result.innerHTML = "未在图片中识别到二维码。";
}
};
img.src = e.target.result;
};
reader.readAsDataURL(file);
}
function decodeQRData(code) {
// Use binaryData with UTF-8 decoding to properly support Chinese and other non-ASCII characters.
// jsQR's code.data may return a legacy string that drops multi-byte characters.
if (code.binaryData && code.binaryData.length) {
try {
const bytes = new Uint8Array(code.binaryData);
return new TextDecoder('utf-8').decode(bytes);
} catch (e) {
console.error('Failed to decode QR data as UTF-8:', e);
}
}
return code.data || '';
}
function displayResult(data) {
currentResult = data;
copyResultBtn.style.display = 'inline-block';
copyResultBtn.classList.remove('copied');
copyResultBtn.textContent = '复制识别结果';
let content = data;
if (isValidUrl(content)) {
content = `<a href="${escapeHtml(data)}" target="_blank">${escapeHtml(data)}</a>`;
result.innerHTML = `${content}`;
} else {
result.textContent = `${data}`;
}
}
async function copyResult() {
if (!currentResult) return;
try {
await navigator.clipboard.writeText(currentResult);
copyResultBtn.classList.add('copied');
copyResultBtn.textContent = '已复制';
setTimeout(() => {
copyResultBtn.classList.remove('copied');
copyResultBtn.textContent = '复制识别结果';
}, 1500);
} catch (err) {
console.error('Copy failed:', err);
copyResultBtn.textContent = '复制失败';
setTimeout(() => {
copyResultBtn.textContent = '复制识别结果';
}, 1500);
}
}
function isValidUrl(string) {
try {
new URL(string);
return true;
} catch (_) {
return false;
}
}
function escapeHtml(str) {
const div = document.createElement('div');
div.textContent = str;
return div.innerHTML;
}
// --- Mode toggle ---
function setMode(mode) {
currentMode = mode;
if (mode === 'image') {
imageModeBtn.classList.add('active');
webcamModeBtn.classList.remove('active');
dropArea.style.display = 'flex';
webcamContainer.classList.remove('active');
webcamBottomControls.classList.remove('active');
stopWebcam();
} else {
webcamModeBtn.classList.add('active');
imageModeBtn.classList.remove('active');
dropArea.style.display = 'none';
webcamContainer.classList.add('active');
webcamBottomControls.classList.add('active');
result.innerHTML = '';
}
}
imageModeBtn.addEventListener('click', () => setMode('image'));
webcamModeBtn.addEventListener('click', () => setMode('webcam'));
// --- Webcam functionality ---
async function checkCameras() {
try {
const devices = await navigator.mediaDevices.enumerateDevices();
const videoDevices = devices.filter(d => d.kind === 'videoinput');
hasMultipleCameras = videoDevices.length > 1;
} catch (e) {
console.log('Could not enumerate devices:', e);
}
}
async function startWebcam() {
try {
webcamStatus.textContent = '正在请求摄像头权限...';
const constraints = {
video: {
facingMode: currentFacingMode,
width: { ideal: 640 },
height: { ideal: 480 }
}
};
webcamStream = await navigator.mediaDevices.getUserMedia(constraints);
webcamVideo.srcObject = webcamStream;
videoWrapper.style.display = 'block';
webcamPlaceholder.style.display = 'none';
startCameraBtn.style.display = 'none';
stopCameraBtn.style.display = 'inline-block';
// Reset zoom
currentScale = 1;
webcamVideo.style.transform = 'scale(1)';
await checkCameras();
if (hasMultipleCameras) {
switchCameraBtn.style.display = 'inline-block';
}
webcamStatus.textContent = '摄像头已开启，正在识别二维码...';
// Start the scanning loop
startScanLoop();
} catch (error) {
console.error('Camera error:', error);
webcamStatus.textContent = `摄像头错误：${error.message}`;
}
}
function stopWebcam() {
if (scanInterval) {
clearInterval(scanInterval);
scanInterval = null;
}
if (webcamStream) {
webcamStream.getTracks().forEach(track => track.stop());
webcamStream = null;
}
webcamVideo.srcObject = null;
videoWrapper.style.display = 'none';
webcamPlaceholder.style.display = 'flex';
startCameraBtn.style.display = 'inline-block';
stopCameraBtn.style.display = 'none';
switchCameraBtn.style.display = 'none';
webcamStatus.textContent = '';
// Reset zoom
currentScale = 1;
webcamVideo.style.transform = 'scale(1)';
}
async function switchCamera() {
currentFacingMode = currentFacingMode === 'environment' ? 'user' : 'environment';
stopWebcam();
await startWebcam();
}
function scanFrame() {
const canvas = document.createElement('canvas');
canvas.width = webcamVideo.videoWidth;
canvas.height = webcamVideo.videoHeight;
if (canvas.width === 0 || canvas.height === 0) {
return;
}
const ctx = canvas.getContext('2d');
ctx.drawImage(webcamVideo, 0, 0, canvas.width, canvas.height);
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const code = jsQR(imageData.data, imageData.width, imageData.height);
if (code) {
const decoded = decodeQRData(code);
displayResult(decoded);
webcamStatus.textContent = '已识别到二维码！继续扫描中...';
}
}
function startScanLoop() {
if (scanInterval) {
clearInterval(scanInterval);
}
// Scan once video is ready
webcamVideo.addEventListener('loadeddata', () => {
scanFrame();
}, { once: true });
// Then scan every 200ms
scanInterval = setInterval(() => {
if (webcamStream) {
scanFrame();
}
}, 200);
}
// Webcam button handlers
startCameraBtn.addEventListener('click', startWebcam);
stopCameraBtn.addEventListener('click', stopWebcam);
switchCameraBtn.addEventListener('click', switchCamera);
copyResultBtn.addEventListener('click', copyResult);
// --- Pinch-to-zoom ---
function getDistance(touches) {
const dx = touches[0].clientX - touches[1].clientX;
const dy = touches[0].clientY - touches[1].clientY;
return Math.sqrt(dx * dx + dy * dy);
}
videoWrapper.addEventListener('touchstart', (e) => {
if (e.touches.length === 2) {
e.preventDefault();
initialDistance = getDistance(e.touches);
initialScale = currentScale;
zoomHint.style.opacity = '1';
}
}, { passive: false });
videoWrapper.addEventListener('touchmove', (e) => {
if (e.touches.length === 2 && initialDistance !== null) {
e.preventDefault();
const currentDistance = getDistance(e.touches);
const scaleFactor = currentDistance / initialDistance;
currentScale = Math.min(Math.max(initialScale * scaleFactor, 1), 4);
webcamVideo.style.transform = `scale(${currentScale})`;
zoomHint.textContent = `${currentScale.toFixed(1)}x 缩放`;
}
}, { passive: false });
videoWrapper.addEventListener('touchend', (e) => {
if (e.touches.length < 2) {
initialDistance = null;
zoomHint.style.opacity = '0';
zoomHint.textContent = '双指捏合缩放';
}
});
// Double-tap to reset zoom
let lastTap = 0;
videoWrapper.addEventListener('touchend', (e) => {
if (e.touches.length === 0) {
const now = Date.now();
if (now - lastTap < 300) {
currentScale = 1;
webcamVideo.style.transform = 'scale(1)';
zoomHint.textContent = '缩放已重置';
zoomHint.style.opacity = '1';
setTimeout(() => {
zoomHint.style.opacity = '0';
zoomHint.textContent = '双指捏合缩放';
}, 500);
}
lastTap = now;
}
});
};
</script>
</body>
</html>