189 lines
5.6 KiB
HTML
189 lines
5.6 KiB
HTML
<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>电子签名板</title>
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<style>
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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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font-family: "Microsoft YaHei", sans-serif;
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}
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body {
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background-color: #f5f7fa;
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padding: 30px;
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}
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.container {
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max-width: 800px;
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margin: 0 auto;
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background: #fff;
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padding: 25px;
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border-radius: 12px;
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box-shadow: 0 2px 15px rgba(0,0,0,0.1);
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}
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h2 {
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text-align: center;
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color: #333;
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margin-bottom: 20px;
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}
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.tool-bar {
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display: flex;
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flex-wrap: wrap;
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gap: 12px;
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margin-bottom: 15px;
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align-items: center;
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}
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button {
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padding: 8px 16px;
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border: none;
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border-radius: 6px;
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cursor: pointer;
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font-size: 14px;
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transition: 0.2s;
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}
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#clearBtn {
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background: #ff4d4f;
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color: white;
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}
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#saveBtn {
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background: #1677ff;
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color: white;
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}
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button:hover {
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opacity: 0.85;
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}
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.line-wrap {
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display: flex;
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align-items: center;
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gap: 8px;
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}
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#canvasBox {
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border: 2px solid #ccc;
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border-radius: 8px;
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background: #fff;
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}
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canvas {
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display: block;
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cursor: crosshair;
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}
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</style>
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</head>
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<body>
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<div class="container">
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<h2>电子签名手写板</h2>
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<div class="tool-bar">
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<button id="clearBtn">清空签名</button>
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<button id="saveBtn">下载签名图片</button>
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<div class="line-wrap">
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<span>画笔粗细：</span>
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<input type="range" id="lineWidth" min="1" max="20" value="4">
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</div>
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<div class="line-wrap">
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<span>画笔颜色：</span>
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<input type="color" id="colorPicker" value="#000000">
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</div>
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</div>
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<div id="canvasBox">
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<canvas id="signCanvas" width="750" height="350"></canvas>
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</div>
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</div>
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<script>
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// 获取元素
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const canvas = document.getElementById('signCanvas');
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const ctx = canvas.getContext('2d');
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const clearBtn = document.getElementById('clearBtn');
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const saveBtn = document.getElementById('saveBtn');
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const lineWidthInput = document.getElementById('lineWidth');
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const colorPicker = document.getElementById('colorPicker');
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// 绘图状态
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let isDraw = false;
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let lastX = 0;
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let lastY = 0;
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// 初始化画笔
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ctx.lineCap = 'round';
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ctx.lineJoin = 'round';
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ctx.lineWidth = lineWidthInput.value;
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ctx.strokeStyle = colorPicker.value;
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// 鼠标按下
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canvas.addEventListener('mousedown', startDraw);
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// 鼠标移动
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canvas.addEventListener('mousemove', drawing);
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// 鼠标松开/离开
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canvas.addEventListener('mouseup', stopDraw);
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canvas.addEventListener('mouseleave', stopDraw);
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// 触屏兼容（手机平板可用）
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canvas.addEventListener('touchstart', touchStart);
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canvas.addEventListener('touchmove', touchDraw);
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canvas.addEventListener('touchend', stopDraw);
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// 画笔粗细切换
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lineWidthInput.addEventListener('input', () => {
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ctx.lineWidth = lineWidthInput.value;
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});
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// 画笔颜色切换
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colorPicker.addEventListener('input', () => {
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ctx.strokeStyle = colorPicker.value;
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});
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// 清空画布
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clearBtn.addEventListener('click', () => {
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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});
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// 下载签名图片
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saveBtn.addEventListener('click', () => {
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const link = document.createElement('a');
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link.download = '我的签名.png';
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link.href = canvas.toDataURL('image/png');
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link.click();
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});
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// 鼠标绘图函数
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function startDraw(e) {
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isDraw = true;
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lastX = e.offsetX;
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lastY = e.offsetY;
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}
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function drawing(e) {
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if (!isDraw) return;
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ctx.beginPath();
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ctx.moveTo(lastX, lastY);
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ctx.lineTo(e.offsetX, e.offsetY);
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ctx.stroke();
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lastX = e.offsetX;
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lastY = e.offsetY;
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}
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function stopDraw() {
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isDraw = false;
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}
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// 触屏绘图函数
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function touchStart(e) {
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e.preventDefault();
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const touch = e.touches[0];
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const mouseEvent = new MouseEvent('mousedown', {
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offsetX: touch.clientX - canvas.getBoundingClientRect().left,
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offsetY: touch.clientY - canvas.getBoundingClientRect().top
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});
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canvas.dispatchEvent(mouseEvent);
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}
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function touchDraw(e) {
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e.preventDefault();
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const touch = e.touches[0];
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const mouseEvent = new MouseEvent('mousemove', {
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offsetX: touch.clientX - canvas.getBoundingClientRect().left,
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offsetY: touch.clientY - canvas.getBoundingClientRect().top
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});
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canvas.dispatchEvent(mouseEvent);
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}
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</script>
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</body>
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</html>
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