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fix: NEW修复预览与保存不一致，添加3:4比例，输入框透明无边框

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Zhukj
2026-04-15 10:00:16 +08:00
parent ba45fd0592
commit e377aaf73c
4 changed files with 763 additions and 17 deletions
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README.md Normal file
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***项目要求***
一款以手机端为主、电脑端兼容的简易邀请函在线制作工具，无需安装、无需后端，打开浏览器即可使用。用户可上传背景图、添加文字、拖动位置，最终一键生成并保存完整邀请函图片。
核心功能
1. 设备适配
移动端优先设计，手机操作最流畅
电脑端完全兼容，可正常制作、编辑、保存
背景图自动适应屏幕大小，不变形、不拉伸
2. 预览区域规范
预览区域固定 3:5 比例
容器居中显示，美观大方
背景图自适应铺满容器
3. 背景图上传
支持本地图片上传
支持 jpg /png/jpeg 格式
自动居中、自适应保留原有比例
4. 输入框功能
页面加载自动在右下角生成 2 个输入框，输入框为透明无边框设计
双击输入框 → 编辑文字
点击 / 长按输入框 → 可拖动位置
两个输入框完全独立，拖动互不影响
可随意拖拽到预览区域内任意位置
5. 操作交互优化
点击空白区域 → 自动取消输入框选中状态
未选中时无法编辑、无法拖动
避免误触、避免乱跑、避免重叠操作
6. 图片保存 / 导出（最重要）
电脑端：右键预览区域 → 自动合成并保存图片
手机端：长按预览区域 → 自动合成并保存图片
合成内容 = 背景图 + 所有输入框文字
输出一张完整的邀请函图片
***使用说明（最简流程）***
打开页面
上传背景图
双击输入框填写文字
单击输入框拖动到合适位置
电脑：右键保存图片
手机：长按保存图片
完成制作
## 要求记录
1. 我要求打开项目即显示 3:5 空白面板，背景图自动覆盖容器、超出部分自动裁剪，不拉伸、不变形
2. 我要求两个独立输入框，可双击编辑、可拖动，文字背景透明无边框
3. 我要求电脑端：右键预览区域可直接复制图片到剪贴板，移动端：长按预览区域可保存图片，操作简单，一键导出图片（复制 / 保存）
4. 预览的图片样式和保存的样式不一样，需要改成预览是什么样子，保存出来的图片内容就是什么样子

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css/style.css Normal file
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* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html, body {
height: 100%;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
background: #f5f5f5;
overflow: hidden;
-webkit-user-select: none;
user-select: none;
}
.app {
display: flex;
flex-direction: column;
height: 100vh;
}
/* 顶部工具栏 */
.toolbar {
display: flex;
justify-content: center;
gap: 16px;
padding: 12px 16px;
background: #fff;
border-bottom: 1px solid #e0e0e0;
flex-shrink: 0;
}
.btn {
padding: 10px 24px;
font-size: 15px;
border: 1px solid #ddd;
border-radius: 6px;
background: #fff;
color: #333;
cursor: pointer;
transition: all 0.2s;
}
.btn:active {
background: #f0f0f0;
}
.btn-primary {
background: #4a90e2;
color: #fff;
border-color: #4a90e2;
}
.btn-primary:active {
background: #3a7bc8;
}
/* 图片展示区 */
.canvas-area {
flex: 1;
display: flex;
align-items: center;
justify-content: center;
padding: 16px;
overflow: auto;
position: relative;
}
.empty-tip {
color: #999;
font-size: 14px;
}
/* 预览区域固定 3:5 比例，打开即显示空白面板 */
.image-container {
display: flex;
position: relative;
width: 100%;
max-width: 360px;
aspect-ratio: 3 / 5;
box-shadow: 0 4px 20px rgba(0,0,0,0.15);
background: #fff;
overflow: hidden;
}
.image-container.empty {
background: #f0f0f0;
border: 2px dashed #ddd;
}
/* 背景图自适应铺满容器，超出部分裁剪 */
#bgImage {
display: block;
width: 100%;
height: 100%;
object-fit: cover;
object-position: center;
-webkit-user-drag: none;
}
#bgImage[src=""] {
display: none;
}
/* 文字输入框 - 透明无边框设计 */
.text-input {
position: absolute;
min-width: 80px;
min-height: 32px;
padding: 4px 8px;
font-size: 18px;
color: #333;
background: transparent;
border: 2px solid transparent;
border-radius: 4px;
outline: none;
cursor: grab;
white-space: nowrap;
line-height: 1.4;
-webkit-user-select: none;
user-select: none;
transition: border-color 0.2s;
}
/* 选中状态（单击/长按） - 仅显示虚线边框 */
.text-input.selected {
border: 2px dashed rgba(74, 144, 226, 0.6);
cursor: grab;
}
/* 编辑状态（双击） - 显示实线边框 */
.text-input.editing {
border: 2px solid #4a90e2;
background: rgba(255,255,255,0.1);
cursor: text;
-webkit-user-select: text;
user-select: text;
}
/* 拖拽状态 */
.text-input.dragging {
opacity: 0.8;
cursor: grabbing;
}
/* 隐藏空提示 */
.empty-tip.hidden {
display: none;
}
/* 长按提示 */
.long-press-tip {
position: fixed;
bottom: 20px;
left: 50%;
transform: translateX(-50%);
padding: 8px 16px;
background: rgba(0,0,0,0.7);
color: #fff;
font-size: 12px;
border-radius: 16px;
opacity: 0;
transition: opacity 0.3s;
pointer-events: none;
z-index: 1000;
}
.long-press-tip.show {
opacity: 1;
}
/* 右键菜单 */
.context-menu {
position: fixed;
background: #fff;
border: 1px solid #ddd;
border-radius: 6px;
box-shadow: 0 4px 12px rgba(0,0,0,0.15);
padding: 4px 0;
z-index: 1000;
min-width: 140px;
}
.context-menu-item {
padding: 10px 16px;
font-size: 14px;
color: #333;
cursor: pointer;
transition: background 0.2s;
}
.context-menu-item:hover {
background: #f5f5f5;
}
.context-menu-item:active {
background: #e8e8e8;
}

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index.html
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<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>极简邀请函制作</title>
<link rel="stylesheet" href="style.css">
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<div class="app">
@@ -17,24 +17,12 @@
<!-- 图片展示区 -->
<div class="canvas-area" id="canvasArea">
<div class="empty-tip" id="emptyTip">请点击上方「添加图片」按钮上传背景图</div>
<div class="image-container" id="imageContainer">
<div class="image-container empty" id="imageContainer">
<img id="bgImage" src="" alt="背景图">
<!-- 文字输入框1 -->
<div class="text-input" id="input1" contenteditable="false">姓名：</div>
<div class="text-input" id="input1" contenteditable="false" style="left: 60%; top: 75%;">姓名</div>
<!-- 文字输入框2 -->
<div class="text-input" id="input2" contenteditable="false">编号：</div>
</div>
</div>
<!-- 手机端输入控制区 -->
<div class="mobile-input-controls" id="mobileInputControls">
<div class="input-control-group">
<label>姓名：</label>
<input type="text" id="mobileInput1" placeholder="请输入姓名" value="姓名">
</div>
<div class="input-control-group">
<label>编号：</label>
<input type="text" id="mobileInput2" placeholder="请输入编号" value="编号">
<div class="text-input" id="input2" contenteditable="false" style="left: 60%; top: 85%;">编号</div>
</div>
</div>
@@ -45,6 +33,6 @@
<input type="file" id="fileInput" accept="image/*" hidden>
<canvas id="exportCanvas" hidden></canvas>
<script src="script.js"></script>
<script src="js/script.js"></script>
</body>
</html>

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js/script.js Normal file
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// 极简邀请函制作工具
(function() {
const fileInput = document.getElementById('fileInput');
const addImageBtn = document.getElementById('addImageBtn');
const saveBtn = document.getElementById('saveBtn');
const imageContainer = document.getElementById('imageContainer');
const bgImage = document.getElementById('bgImage');
const emptyTip = document.getElementById('emptyTip');
const input1 = document.getElementById('input1');
const input2 = document.getElementById('input2');
const exportCanvas = document.getElementById('exportCanvas');
const longPressTip = document.getElementById('longPressTip');
const canvasArea = document.getElementById('canvasArea');
let currentImage = null;
let selectedInput = null;
let editingInput = null;
let longPressTimer = null;
// 初始化
init();
function init() {
// 添加图片按钮
addImageBtn.addEventListener('click', () => {
fileInput.click();
});
// 文件选择
fileInput.addEventListener('change', (e) => {
const file = e.target.files[0];
if (file) {
loadImage(file);
}
fileInput.value = '';
});
// 保存按钮
saveBtn.addEventListener('click', saveImage);
// 初始化输入框
initInput(input1);
initInput(input2);
// 点击外部取消选中
document.addEventListener('click', (e) => {
if (!e.target.closest('.text-input') && !e.target.closest('.image-container')) {
deselectAll();
}
});
// 初始化长按保存
initLongPressSave();
// 初始化右键菜单
initContextMenu();
// 显示长按提示
setTimeout(() => {
longPressTip.classList.add('show');
setTimeout(() => {
longPressTip.classList.remove('show');
}, 3000);
}, 1000);
}
// 加载图片
function loadImage(file) {
const reader = new FileReader();
reader.onload = (e) => {
const img = new Image();
img.onload = () => {
currentImage = img;
bgImage.src = img.src;
imageContainer.classList.remove('empty');
emptyTip.classList.add('hidden');
};
img.src = e.target.result;
};
reader.readAsDataURL(file);
}
// 初始化输入框 - 每个输入框独立管理自己的拖拽状态
function initInput(element) {
// 每个输入框独立的状态变量
let isMouseDown = false;
let isDragging = false;
let dragTimer = null;
let startX, startY, startLeft, startTop;
let clickStartTime = 0;
let clickStartX = 0;
let clickStartY = 0;
let hasMoved = false;
// 鼠标/触摸按下
element.addEventListener('mousedown', handleStart);
element.addEventListener('touchstart', handleStart, { passive: false });
function handleStart(e) {
const isTouch = e.type === 'touchstart';
const clientX = isTouch ? e.touches[0].clientX : e.clientX;
const clientY = isTouch ? e.touches[0].clientY : e.clientY;
// 标记鼠标/手指按下
isMouseDown = true;
clickStartTime = Date.now();
clickStartX = clientX;
clickStartY = clientY;
hasMoved = false;
isDragging = false;
// 如果正在编辑此输入框，不处理
if (editingInput === element) {
return;
}
// 选中此输入框
selectInput(element);
startX = clientX;
startY = clientY;
startLeft = element.offsetLeft;
startTop = element.offsetTop;
// 延迟判断是否为拖拽（150ms后判定为拖拽）
dragTimer = setTimeout(() => {
if (isMouseDown) {
isDragging = true;
element.classList.add('dragging');
}
}, 150);
if (isTouch) {
e.preventDefault();
}
}
// 鼠标/触摸移动 - 绑定到元素上
element.addEventListener('mousemove', handleMove);
element.addEventListener('touchmove', handleMove, { passive: false });
function handleMove(e) {
// 必须按住鼠标/手指才能拖动
if (!isMouseDown) return;
if (!selectedInput || editingInput === element) return;
const isTouch = e.type === 'touchmove';
const clientX = isTouch ? e.touches[0].clientX : e.clientX;
const clientY = isTouch ? e.touches[0].clientY : e.clientY;
// 判断是否移动
const moveDistance = Math.sqrt(
Math.pow(clientX - clickStartX, 2) +
Math.pow(clientY - clickStartY, 2)
);
if (moveDistance > 5) {
hasMoved = true;
if (dragTimer) {
clearTimeout(dragTimer);
dragTimer = null;
}
if (!isDragging) {
isDragging = true;
element.classList.add('dragging');
}
}
if (isDragging) {
const dx = clientX - startX;
const dy = clientY - startY;
element.style.left = (startLeft + dx) + 'px';
element.style.top = (startTop + dy) + 'px';
if (isTouch) {
e.preventDefault();
}
}
}
// 鼠标/触摸释放 - 绑定到元素上
element.addEventListener('mouseup', handleEnd);
element.addEventListener('touchend', handleEnd);
// 鼠标离开元素时也结束拖拽
element.addEventListener('mouseleave', (e) => {
if (isMouseDown) {
handleEnd(e);
}
});
function handleEnd(e) {
// 标记鼠标/手指释放
isMouseDown = false;
// 清除拖拽定时器
if (dragTimer) {
clearTimeout(dragTimer);
dragTimer = null;
}
const clickDuration = Date.now() - clickStartTime;
// 如果是快速点击且未移动，判定为单击（仅选中，不编辑）
if (!hasMoved && clickDuration < 200 && !isDragging) {
// 单击仅选中，不进入编辑模式
if (e && e.preventDefault) {
e.preventDefault();
}
}
// 立即结束拖拽状态
if (isDragging) {
isDragging = false;
element.classList.remove('dragging');
}
}
// 双击进入编辑模式
element.addEventListener('dblclick', (e) => {
e.stopPropagation();
startEdit(element);
});
// 触摸双击检测
let lastTapTime = 0;
element.addEventListener('touchend', (e) => {
const currentTime = Date.now();
if (currentTime - lastTapTime < 300) {
// 双击检测
e.preventDefault();
e.stopPropagation();
startEdit(element);
}
lastTapTime = currentTime;
});
}
// 选中输入框
function selectInput(element) {
// 如果有其他输入框在编辑，先退出编辑
if (editingInput && editingInput !== element) {
endEdit(editingInput);
}
// 取消之前的选中
if (selectedInput && selectedInput !== element) {
selectedInput.classList.remove('selected');
}
// 选中当前输入框
selectedInput = element;
element.classList.add('selected');
element.classList.remove('editing');
element.contentEditable = 'false';
}
// 开始编辑
function startEdit(element) {
if (editingInput && editingInput !== element) {
endEdit(editingInput);
}
editingInput = element;
selectedInput = element;
element.classList.add('editing');
element.classList.remove('selected');
element.contentEditable = 'true';
element.focus();
// 光标定位到末尾
const range = document.createRange();
const sel = window.getSelection();
range.selectNodeContents(element);
range.collapse(false);
sel.removeAllRanges();
sel.addRange(range);
// 移动端显示键盘
if ('virtualKeyboard' in navigator) {
navigator.virtualKeyboard.show();
}
}
// 结束编辑
function endEdit(element) {
element.classList.remove('editing');
element.contentEditable = 'false';
element.blur();
editingInput = null;
}
// 取消所有选中
function deselectAll() {
if (editingInput) {
endEdit(editingInput);
}
if (selectedInput) {
selectedInput.classList.remove('selected');
selectedInput = null;
}
}
// 初始化长按保存
function initLongPressSave() {
canvasArea.addEventListener('touchstart', (e) => {
// 如果触摸的是输入框，不触发长按保存
if (e.target.closest('.text-input')) {
return;
}
longPressTimer = setTimeout(() => {
// 震动反馈
if (navigator.vibrate) {
navigator.vibrate(50);
}
// 保存图片
saveImage();
}, 800);
}, { passive: true });
canvasArea.addEventListener('touchend', () => {
if (longPressTimer) {
clearTimeout(longPressTimer);
longPressTimer = null;
}
});
canvasArea.addEventListener('touchmove', () => {
if (longPressTimer) {
clearTimeout(longPressTimer);
longPressTimer = null;
}
});
}
// 初始化右键菜单
function initContextMenu() {
// 禁用默认右键菜单
canvasArea.addEventListener('contextmenu', (e) => {
// 如果右键点击的是输入框，显示默认菜单
if (e.target.closest('.text-input')) {
return;
}
e.preventDefault();
showContextMenu(e.clientX, e.clientY);
});
// 点击其他地方关闭菜单
document.addEventListener('click', () => {
hideContextMenu();
});
}
// 显示右键菜单
function showContextMenu(x, y) {
hideContextMenu();
const menu = document.createElement('div');
menu.className = 'context-menu';
menu.id = 'contextMenu';
menu.style.left = x + 'px';
menu.style.top = y + 'px';
// 复制到剪贴板选项
const copyItem = document.createElement('div');
copyItem.className = 'context-menu-item';
copyItem.textContent = '复制图片';
copyItem.addEventListener('click', async () => {
await copyImageToClipboard();
hideContextMenu();
});
// 保存图片选项
const saveItem = document.createElement('div');
saveItem.className = 'context-menu-item';
saveItem.textContent = '保存图片';
saveItem.addEventListener('click', () => {
saveImage();
hideContextMenu();
});
menu.appendChild(copyItem);
menu.appendChild(saveItem);
document.body.appendChild(menu);
}
// 隐藏右键菜单
function hideContextMenu() {
const existingMenu = document.getElementById('contextMenu');
if (existingMenu) {
existingMenu.remove();
}
}
// 复制图片到剪贴板
async function copyImageToClipboard() {
if (!currentImage) {
alert('请先添加背景图片');
return;
}
try {
// 取消所有选中和编辑状态
deselectAll();
const canvas = await generateCanvas();
const blob = await new Promise(resolve => canvas.toBlob(resolve, 'image/png'));
await navigator.clipboard.write([
new ClipboardItem({ 'image/png': blob })
]);
alert('图片已复制到剪贴板');
} catch (err) {
console.error('复制失败:', err);
alert('复制失败，请尝试保存图片');
}
}
// 生成画布（预览与保存样式一致）
async function generateCanvas() {
const canvas = exportCanvas;
const ctx = canvas.getContext('2d');
// 获取容器实际尺寸
const containerWidth = imageContainer.clientWidth;
const containerHeight = imageContainer.clientHeight;
// 设置画布尺寸与容器一致
canvas.width = containerWidth;
canvas.height = containerHeight;
// 绘制白色背景
ctx.fillStyle = '#fff';
ctx.fillRect(0, 0, canvas.width, canvas.height);
// 如果有背景图，绘制背景图（保持cover效果）
if (currentImage) {
drawImageCover(ctx, currentImage, 0, 0, containerWidth, containerHeight);
}
// 绘制文字（保持与预览完全一致的位置和样式）
drawTextOnCanvas(ctx, input1, containerWidth, containerHeight);
drawTextOnCanvas(ctx, input2, containerWidth, containerHeight);
return canvas;
}
// 绘制图片保持cover效果（与CSS object-fit: cover一致）
function drawImageCover(ctx, img, x, y, width, height) {
const imgRatio = img.naturalWidth / img.naturalHeight;
const containerRatio = width / height;
let drawWidth, drawHeight, drawX, drawY;
if (imgRatio > containerRatio) {
// 图片更宽，以高度为基准
drawHeight = height;
drawWidth = height * imgRatio;
drawX = x + (width - drawWidth) / 2;
drawY = y;
} else {
// 图片更高，以宽度为基准
drawWidth = width;
drawHeight = width / imgRatio;
drawX = x;
drawY = y + (height - drawHeight) / 2;
}
ctx.drawImage(img, drawX, drawY, drawWidth, drawHeight);
}
// 在画布上绘制文字（保持与预览完全一致）
function drawTextOnCanvas(ctx, inputElement, containerWidth, containerHeight) {
const text = inputElement.textContent;
if (!text) return;
const style = window.getComputedStyle(inputElement);
// 获取输入框位置（相对于容器）
const inputLeft = inputElement.offsetLeft;
const inputTop = inputElement.offsetTop;
// 设置字体样式（与预览完全一致）
const fontSize = parseInt(style.fontSize);
ctx.font = `${style.fontWeight} ${fontSize}px ${style.fontFamily}`;
ctx.fillStyle = style.color;
ctx.textBaseline = 'top';
// 绘制文字（保持与预览完全一致的位置）
ctx.fillText(text, inputLeft, inputTop);
}
// 保存图片
async function saveImage() {
if (!currentImage) {
alert('请先添加背景图片');
return;
}
try {
const canvas = await generateCanvas();
// 下载图片
const link = document.createElement('a');
link.download = '邀请函_' + Date.now() + '.png';
link.href = canvas.toDataURL('image/png');
link.click();
} catch (err) {
console.error('保存失败:', err);
alert('保存失败，请重试');
}
}
})();