fetch: 同步远程仓库最新版本信息

css/style.css

@@ -104,6 +104,49 @@ html, body {
     z-index: 100;
 }
 
+/* 编辑模式：粘在视口顶部始终可见 */
+.editor-toolbar.editing-mode {
+    position: fixed;
+    top: 0;
+    border-bottom: 1px solid #e0e0e0;
+    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
+    z-index: 10000;
+}
+
+/* 移动端：允许横向滚动 */
+@media (max-width: 768px) {
+    .editor-toolbar {
+        justify-content: flex-start;
+        overflow-x: auto;
+        -webkit-overflow-scrolling: touch;
+        scrollbar-width: none;
+        padding: 8px;
+    }
+    .editor-toolbar::-webkit-scrollbar {
+        display: none;
+    }
+    .toolbar-group {
+        gap: 2px;
+        flex-shrink: 0;
+    }
+    .toolbar-btn {
+        width: 32px;
+        height: 32px;
+        font-size: 14px;
+    }
+    .toolbar-label {
+        font-size: 11px;
+    }
+    .toolbar-label span {
+        display: none;
+    }
+    .roller-picker {
+        min-width: 50px;
+        height: 32px;
+        padding: 2px 4px;
+    }
+}
+
 .editor-toolbar.active {
     visibility: visible;
     opacity: 1;
@@ -381,7 +424,7 @@ html, body {
     padding: 0;
     font-size: 16px;
     color: #000;
-    font-family: "Microsoft YaHei", "微软雅黑", sans-serif;
+    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
     background: transparent;
     outline: 2px solid transparent;
     border-radius: 4px;
@@ -403,6 +446,19 @@ html, body {
     cursor: grab;
 }
 
+/* 锁定状态 */
+.text-input.locked {
+    cursor: default !important;
+}
+
+.text-input.locked.selected {
+    outline: 2px dashed rgba(255, 193, 7, 0.8);
+}
+
+.text-input.locked .text-delete-btn {
+    display: none !important;
+}
+
 /* 空输入框显示 placeholder */
 .text-input.show-placeholder::before {
     content: attr(data-placeholder);
@@ -513,3 +569,23 @@ html, body {
 .guide-line.visible {
     display: block;
 }
+
+/* 1px 网格线 */
+.grid-lines {
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    pointer-events: none;
+    z-index: 5;
+    display: none;
+    background-image: 
+        linear-gradient(to right, rgba(0, 0, 0, 0.05) 1px, transparent 1px),
+        linear-gradient(to bottom, rgba(0, 0, 0, 0.05) 1px, transparent 1px);
+    background-size: 10px 10px;
+}
+
+.grid-lines.visible {
+    display: block;
+}

index.html

@@ -20,6 +20,8 @@
         <div class="editor-toolbar" id="editorToolbar">
             <!-- 文本编辑工具 -->
             <div class="toolbar-group text-tools" id="textTools">
+                <button class="toolbar-btn" id="lockBtn" title="锁定位置">🔒</button>
+                <div class="toolbar-divider"></div>
                 <button class="toolbar-btn" id="boldBtn" title="加粗">B</button>
                 <button class="toolbar-btn italic" id="italicBtn" title="斜体">I</button>
                 <div class="toolbar-divider"></div>
@@ -31,10 +33,11 @@
                 <label class="toolbar-label">
                     <span>字体</span>
                     <select id="fontPicker">
-                        <option value="Microsoft YaHei">雅黑</option>
+                        <option value="-apple-system, BlinkMacSystemFont, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Noto Sans CJK SC, sans-serif">系统默认</option>
-                        <option value="SimHei">黑体</option>
+                        <option value="PingFang SC, Microsoft YaHei, Noto Sans CJK SC, sans-serif">苹方/雅黑</option>
-                        <option value="SimSun">宋体</option>
+                        <option value="Hiragino Sans GB, Microsoft YaHei, Noto Sans CJK SC, sans-serif">冬青黑体</option>
-                        <option value="Arial">Arial</option>
+                        <option value="SimHei, Microsoft YaHei, Noto Sans CJK SC, sans-serif">黑体</option>
+                        <option value="SimSun, Songti SC, serif">宋体</option>
                     </select>
                 </label>
                 <div class="toolbar-divider"></div>
@@ -80,17 +83,19 @@
                 </div>
                 <!-- 层叠图图层 -->
                 <div class="overlay-layer" id="overlayLayer"></div>
+                <!-- 1px 网格线 -->
+                <div class="grid-lines" id="gridLines"></div>
                 <!-- 拖拽辅助线 -->
                 <div class="guide-line guide-horizontal" id="guideH"></div>
                 <div class="guide-line guide-vertical" id="guideV"></div>
                 <!-- 输入框图层 -->
                 <div class="preview-input-layer" id="previewInputLayer">
                     <!-- 文字输入框1 - 企业 -->
-                    <div class="text-input hidden" id="input1" contenteditable="false" data-placeholder="请输入" style="left: 98px; top: 232.945px;"></div>
+                    <div class="text-input hidden" id="input1" contenteditable="false" data-placeholder="请输入" style="left: 98px; top: 234.445px;"></div>
                     <!-- 文字输入框2 - 姓名 -->
-                    <div class="text-input hidden" id="input2" contenteditable="false" data-placeholder="请输入" style="left: 98px; top: 275.555px;"></div>
+                    <div class="text-input hidden" id="input2" contenteditable="false" data-placeholder="请输入" style="left: 98px; top: 276.355px;"></div>
                     <!-- 文字输入框3 - 编号 -->
-                    <div class="text-input hidden" id="input3" contenteditable="false" data-placeholder="请输入" style="left: 98px; top: 317.548px;"></div>
+                    <div class="text-input hidden" id="input3" contenteditable="false" data-placeholder="请输入" style="left: 98px; top: 319.048px;"></div>
                 </div>
                 <!-- 提示文字（最上层，层叠图之下） -->
                 <div class="empty-tip" id="emptyTip">请点击上方「添加图片」按钮上传背景图</div>

js/script.js

@@ -27,6 +27,7 @@
     const bgOpacityValue = document.getElementById('bgOpacityValue');
     const boldBtn = document.getElementById('boldBtn');
     const italicBtn = document.getElementById('italicBtn');
+    const lockBtn = document.getElementById('lockBtn');
     const colorPicker = document.getElementById('colorPicker');
     const fontPicker = document.getElementById('fontPicker');
     const fontSizePicker = document.getElementById('fontSizePicker');
@@ -38,6 +39,7 @@
     document.body.appendChild(overlayInput);
     const guideH = document.getElementById('guideH');
     const guideV = document.getElementById('guideV');
+    const gridLines = document.getElementById('gridLines');
 
     let currentImage = null;
     let bgImageScale = 1;
@@ -196,7 +198,18 @@
         }
 
         imageContainer.addEventListener('click', handleContainerClick);
-        imageContainer.addEventListener('touchend', handleContainerClick);
+        // 移动端：touchend 时如果正在编辑文本，不处理容器点击
+        imageContainer.addEventListener('touchend', (e) => {
+            // 如果触摸目标是文本输入框或正在编辑，不触发容器点击
+            if (e.target.closest('.text-input')) {
+                return;
+            }
+            // 如果正在编辑文本，不触发容器点击（避免隐藏工具栏）
+            if (editingInput) {
+                return;
+            }
+            handleContainerClick(e);
+        });
 
         // 初始化长按保存（只在3:5预览区域）
         initLongPressSave();
@@ -207,6 +220,9 @@
         // 初始化文本编辑器工具栏
         initTextEditorToolbar();
 
+        // 初始化键盘微调功能
+        initKeyboardNudge();
+
         // 加载默认背景图
         loadDefaultBackground();
 
@@ -450,26 +466,20 @@
             const dx = clientX - startX;
             const dy = clientY - startY;
 
-            const moveDistance = Math.sqrt(dx * dx + dy * dy);
+            // 移除移动距离限制，实现 1px 精确移动
-            if (moveDistance > 5) {
             let newLeft = startLeft + dx;
             let newTop = startTop + dy;
 
-                // 使用吸附功能
+            // 不启用吸附，只限制边界，但显示辅助线
-                const snapped = getSnapPosition(overlayEl, newLeft, newTop);
+            const snapped = getSnapPosition(overlayEl, newLeft, newTop, false);
             newLeft = snapped.left;
             newTop = snapped.top;
             
             // 显示对齐辅助线
-                if (snapped.showGuide) {
             showAlignmentGuides(overlayEl);
-                } else {
-                    hideGuides();
-                }
 
             overlayEl.style.left = newLeft + 'px';
             overlayEl.style.top = newTop + 'px';
-            }
 
             e.preventDefault();
         }
@@ -962,6 +972,11 @@
                 return;
             }
 
+            // 如果已锁定，禁止拖拽
+            if (element.classList.contains('locked')) {
+                return;
+            }
+
             if (!isMouseDown) return;
             if (!selectedInput) return;
 
@@ -974,7 +989,8 @@
                 Math.pow(clientY - clickStartY, 2)
             );
 
-            if (moveDistance > 5) {
+            // 只要有移动就开始拖拽，实现 1px 精确移动
+            if (moveDistance > 0) {
                 hasMoved = true;
                 if (dragTimer) {
                     clearTimeout(dragTimer);
@@ -992,17 +1008,13 @@
                 const newLeft = startLeft + dx;
                 const newTop = startTop + dy;
 
-                // 检测对齐并吸附
+                // 不启用吸附，只限制边界，但显示辅助线
-                const snapped = getSnapPosition(element, newLeft, newTop);
+                const snapped = getSnapPosition(element, newLeft, newTop, false);
                 element.style.left = snapped.left + 'px';
                 element.style.top = snapped.top + 'px';
                 
                 // 显示对齐辅助线
-                if (snapped.showGuide) {
                 showAlignmentGuides(element);
-                } else {
-                    hideGuides();
-                }
             }
 
             // 阻止事件冒泡，避免触发图片滑动
@@ -1039,7 +1051,7 @@
             }
         }
 
-        // 双击进入编辑模式（电脑端和移动端通用）
+        // 双击进入编辑模式（电脑端）
         element.addEventListener('dblclick', (e) => {
             e.stopPropagation();
             startEdit(element);
@@ -1047,22 +1059,17 @@
             setTimeout(() => { element.dataset.justEdited = 'false'; }, 200);
         });
 
-        // 单击选中显示删除按钮
+        // 单击进入编辑模式（同时支持桌面和移动端）
         element.addEventListener('click', (e) => {
             if (hasMoved) return;
             if (element.dataset.justEdited === 'true') return;
-            element.classList.add('selected');
-        });
             
-        // 触摸双击检测（移动端双击进入编辑）
+            // 如果已经在编辑中，不重复进入
-        let lastTapTime = 0;
+            if (editingInput === element) return;
-        element.addEventListener('touchend', (e) => {
+            
-            const currentTime = Date.now();
+            // 选中并立即进入编辑模式
-            if (currentTime - lastTapTime < 300) {
+            selectInput(element);
-                e.stopPropagation();
             startEdit(element);
-            }
-            lastTapTime = currentTime;
         });
     }
 
@@ -1114,9 +1121,26 @@
         imageTools.classList.remove('active');
         bgTools.classList.remove('active');
 
+        // 移动端/编辑模式：固定在顶部始终可见
+        if (window.innerWidth <= 768 || 'ontouchstart' in window) {
+            editorToolbar.classList.add('editing-mode');
+            // 滚动使工具栏和编辑元素可见
+            setTimeout(() => {
+                const rect = element.getBoundingClientRect();
+                const toolbarHeight = editorToolbar.offsetHeight || 50;
+                // 如果文本被工具栏遮挡，滚动页面
+                if (rect.top < toolbarHeight + 10) {
+                    window.scrollBy({ top: rect.top - toolbarHeight - 20, behavior: 'smooth' });
+                }
+            }, 300); // 等待键盘弹出
+        }
+
         // 更新工具栏状态
         updateToolbarState(element);
 
+        // 立即 focus 以触发键盘（必须在用户交互的同步上下文中）
+        element.focus();
+        
         // 如果没有选中文本，则定位光标到末尾
         setTimeout(() => {
             const sel = window.getSelection();
@@ -1127,9 +1151,9 @@
                 sel.removeAllRanges();
                 sel.addRange(range);
             }
-            element.focus();
+        }, 0);
-        }, 10);
 
+        // 使用 Virtual Keyboard API（如果支持）
         if ('virtualKeyboard' in navigator) {
             navigator.virtualKeyboard.show();
         }
@@ -1141,6 +1165,9 @@
         element.classList.add('selected');
         element.contentEditable = 'false';
         
+        // 移除移动端编辑模式样式
+        editorToolbar.classList.remove('editing-mode');
+        
         // 检查是否需要显示 placeholder
         const textContent = Array.from(element.childNodes)
             .filter(node => node.nodeType === Node.TEXT_NODE || (node.nodeType === Node.ELEMENT_NODE && !node.classList.contains('text-delete-btn')))
@@ -1178,13 +1205,25 @@
         // 更新颜色选择器
         colorPicker.value = rgbToHex(color);
 
-        // 更新字体选择器
+        // 更新字体选择器 - 匹配字体栈中的主要字体
+        let matched = false;
         for (let option of fontPicker.options) {
-            if (option.value === fontFamily || fontFamily.includes(option.value)) {
+            const optionFonts = option.value.toLowerCase().split(',').map(f => f.trim());
+            const currentFonts = fontFamily.toLowerCase().split(',').map(f => f.trim());
+            // 检查是否有主要字体匹配
+            if (optionFonts.some(of => currentFonts.includes(of))) {
                 fontPicker.value = option.value;
+                matched = true;
                 break;
             }
         }
+        // 如果没有匹配，默认选择第一个（系统默认）
+        if (!matched && fontPicker.options.length > 0) {
+            fontPicker.value = fontPicker.options[0].value;
+        }
+
+        // 更新锁定按钮状态
+        lockBtn.classList.toggle('active', element.classList.contains('locked'));
 
         // 更新字号选择器
         const fontSizeValueEl = fontSizePicker.querySelector('.roller-value');
@@ -1195,8 +1234,8 @@
         }
     }
 
-    // 获取吸附后的位置
+    // 获取吸附后的位置（可选吸附，不强制）
-    function getSnapPosition(draggedEl, newLeft, newTop) {
+    function getSnapPosition(draggedEl, newLeft, newTop, enableSnap = false) {
         const container = imageContainer;
         const containerRect = container.getBoundingClientRect();
 
@@ -1217,11 +1256,26 @@
         const cCenterX = cWidth / 2;
         const cCenterY = cHeight / 2;
 
-        const threshold = 5;
+        // 默认返回原始位置（不吸附）
         let snapLeft = newLeft;
         let snapTop = newTop;
         let showGuide = false;
 
+        // 如果不启用吸附，只限制边界并返回
+        if (!enableSnap) {
+            // 边界限制
+            snapLeft = Math.max(0, Math.min(snapLeft, cWidth - elWidth));
+            snapTop = Math.max(0, Math.min(snapTop, cHeight - elHeight));
+            return { left: snapLeft, top: snapTop, showGuide };
+        }
+
+        const threshold = 5;
+
+        // 显示网格线
+        if (gridLines) {
+            gridLines.classList.add('visible');
+        }
+
         // 水平垂直分别检测
         let snapX = false;
         let snapY = false;
@@ -1257,7 +1311,7 @@
         }
 
         // 检测其他元素对齐（输入框和层叠图）
-        const otherInputs = [input1, input2].filter(el => el && el !== draggedEl);
+        const otherInputs = [input1, input2, input3].filter(el => el && el !== draggedEl);
         const otherOverlays = Array.from(overlayLayer.querySelectorAll('.overlay-image'))
             .filter(el => el !== draggedEl);
 
@@ -1380,7 +1434,7 @@
             }
         }
 
-        // 应用吸附
+        // 应用吸附（仅在启用吸附时）
         if (snapX && snapXPos !== null) {
             snapLeft = snapXPos;
             showGuide = true;
@@ -1420,7 +1474,7 @@
         const elCenterX = elLeft + elWidth / 2;
         const elCenterY = elTop + elHeight / 2;
 
-        const threshold = 5;
+        const threshold = 1;
         let guideHPos = null;
         let guideVPos = null;
 
@@ -1571,6 +1625,9 @@
     function hideGuides() {
         guideH.classList.remove('visible');
         guideV.classList.remove('visible');
+        if (gridLines) {
+            gridLines.classList.remove('visible');
+        }
     }
 
     // 取消所有选中
@@ -1641,16 +1698,17 @@
     function initTextEditorToolbar() {
         // 加粗按钮
         boldBtn.addEventListener('click', () => {
-            if (!editingInput) return;
+            const targetInput = editingInput || selectedInput;
+            if (!targetInput) return;
             const selection = window.getSelection();
             if (selection.rangeCount > 0 && !selection.isCollapsed) {
                 document.execCommand('bold', false, null);
             } else {
                 const isBold = boldBtn.classList.contains('active');
                 if (isBold) {
-                    editingInput.style.fontWeight = 'normal';
+                    targetInput.style.fontWeight = 'normal';
                 } else {
-                    editingInput.style.fontWeight = 'bold';
+                    targetInput.style.fontWeight = 'bold';
                 }
                 boldBtn.classList.toggle('active');
             }
@@ -1658,36 +1716,53 @@
 
         // 斜体按钮
         italicBtn.addEventListener('click', () => {
-            if (!editingInput) return;
+            const targetInput = editingInput || selectedInput;
+            if (!targetInput) return;
             const selection = window.getSelection();
             if (selection.rangeCount > 0 && !selection.isCollapsed) {
                 document.execCommand('italic', false, null);
             } else {
                 const isItalic = italicBtn.classList.contains('active');
                 if (isItalic) {
-                    editingInput.style.fontStyle = 'normal';
+                    targetInput.style.fontStyle = 'normal';
                 } else {
-                    editingInput.style.fontStyle = 'italic';
+                    targetInput.style.fontStyle = 'italic';
                 }
                 italicBtn.classList.toggle('active');
             }
         });
 
+        // 锁定按钮
+        lockBtn.addEventListener('click', () => {
+            const targetInput = editingInput || selectedInput;
+            if (!targetInput) return;
+            
+            const isLocked = targetInput.classList.contains('locked');
+            if (isLocked) {
+                targetInput.classList.remove('locked');
+            } else {
+                targetInput.classList.add('locked');
+            }
+            lockBtn.classList.toggle('active', !isLocked);
+        });
+
         // 颜色选择器
         colorPicker.addEventListener('input', () => {
-            if (!editingInput) return;
+            const targetInput = editingInput || selectedInput;
+            if (!targetInput) return;
             const selection = window.getSelection();
             if (selection.rangeCount > 0 && !selection.isCollapsed) {
                 document.execCommand('foreColor', false, colorPicker.value);
             } else {
-                editingInput.style.color = colorPicker.value;
+                targetInput.style.color = colorPicker.value;
             }
         });
 
         // 字体选择器
         fontPicker.addEventListener('change', () => {
-            if (!editingInput) return;
+            const targetInput = editingInput || selectedInput;
-            editingInput.style.fontFamily = fontPicker.value + ', sans-serif';
+            if (!targetInput) return;
+            targetInput.style.fontFamily = fontPicker.value;
         });
 
         // 字号选择器 - 密码锁式滚轮
@@ -1738,6 +1813,52 @@
         }, { passive: false });
     }
 
+    // 初始化键盘微调功能（方向键 1px 移动）
+    function initKeyboardNudge() {
+        document.addEventListener('keydown', (e) => {
+            // 如果正在编辑文本，不处理方向键
+            if (editingInput) return;
+
+            // 获取当前选中的元素
+            const targetEl = selectedInput || selectedOverlay;
+            if (!targetEl) return;
+
+            // 如果已锁定，禁止键盘微调
+            if (targetEl.classList.contains('locked')) {
+                return;
+            }
+
+            // 防止默认行为（页面滚动）
+            if (['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight'].includes(e.key)) {
+                e.preventDefault();
+            }
+
+            let currentLeft = parseInt(targetEl.style.left) || targetEl.offsetLeft;
+            let currentTop = parseInt(targetEl.style.top) || targetEl.offsetTop;
+
+            switch(e.key) {
+                case 'ArrowUp':
+                    currentTop -= 1;
+                    break;
+                case 'ArrowDown':
+                    currentTop += 1;
+                    break;
+                case 'ArrowLeft':
+                    currentLeft -= 1;
+                    break;
+                case 'ArrowRight':
+                    currentLeft += 1;
+                    break;
+                default:
+                    return;
+            }
+
+            // 应用新位置（不启用吸附）
+            targetEl.style.left = currentLeft + 'px';
+            targetEl.style.top = currentTop + 'px';
+        });
+    }
+
     // 显示右键菜单
     function showContextMenu(x, y) {
         hideContextMenu();
@@ -1778,10 +1899,49 @@
         document.body.appendChild(menu);
     }
 
+    // 从 blob 显示预览
+    function showPreviewFromBlob(blob) {
+        console.log('预览图片大小:', (blob.size / 1024).toFixed(2), 'KB');
+        const dataUrl = URL.createObjectURL(blob);
+        showPreviewModal(dataUrl, blob);
+    }
+
     // 显示预览
     async function showPreview() {
         const canvas = await generateCanvas();
-        const dataUrl = canvas.toDataURL('image/png');
+        console.log('预览画布尺寸:', canvas.width, 'x', canvas.height);
+        
+        // 尝试使用 toDataURL 获取更高质量的图片
+        let dataUrl;
+        let blob;
+        
+        try {
+            // 先尝试 toDataURL
+            dataUrl = canvas.toDataURL('image/png');
+            console.log('预览 toDataURL 成功，dataUrl 长度:', dataUrl.length);
+            
+            // 将 dataUrl 转换为 blob
+            const response = await fetch(dataUrl);
+            blob = await response.blob();
+            console.log('预览 dataUrl 转 blob 成功，blob 尺寸:', blob.size, 'bytes');
+        } catch (err) {
+            console.log('预览 toDataURL 失败，使用 toBlob:', err);
+            // 如果 toDataURL 失败，使用 toBlob
+            blob = await new Promise(resolve => {
+                canvas.toBlob((b) => {
+                    console.log('预览 toBlob 回调 - blob 尺寸:', b.size, 'bytes');
+                    resolve(b);
+                }, 'image/png', 1.0);
+            });
+            dataUrl = URL.createObjectURL(blob);
+        }
+        
+        console.log('预览图片大小:', (blob.size / 1024).toFixed(2), 'KB');
+        showPreviewModal(dataUrl, blob);
+    }
+
+    // 显示预览弹窗
+    function showPreviewModal(dataUrl, blob) {
 
         const tipOverlay = document.createElement('div');
         tipOverlay.id = 'previewTip';
@@ -1801,7 +1961,7 @@
         `;
 
         const tipText = document.createElement('p');
-        tipText.textContent = '长按图片保存到相册';
+        tipText.innerHTML = '长按图片保存到相册<br><span style="font-size:14px;opacity:0.8">（预览已缩放，实际保存为高清原图）</span>';
         tipText.style.cssText = `
             color: #fff;
             font-size: 18px;
@@ -1841,7 +2001,12 @@
         `;
         saveBtn.onclick = async () => {
             tipOverlay.remove();
-            await saveImageToGallery(dataUrl);
+            await saveImageToGallery(dataUrl, blob);
+            // 重新隐藏 canvas
+            exportCanvas.setAttribute('hidden', '');
+            exportCanvas.style.position = '';
+            exportCanvas.style.left = '';
+            exportCanvas.style.top = '';
         };
 
         const closeBtn = document.createElement('button');
@@ -1855,7 +2020,14 @@
             border-radius: 25px;
             cursor: pointer;
         `;
-        closeBtn.onclick = () => tipOverlay.remove();
+        closeBtn.onclick = () => {
+            tipOverlay.remove();
+            // 重新隐藏 canvas
+            exportCanvas.setAttribute('hidden', '');
+            exportCanvas.style.position = '';
+            exportCanvas.style.left = '';
+            exportCanvas.style.top = '';
+        };
 
         btnContainer.appendChild(saveBtn);
         btnContainer.appendChild(closeBtn);
@@ -1866,13 +2038,17 @@
     }
 
     // 保存图片到相册
-    async function saveImageToGallery(dataUrl) {
+    async function saveImageToGallery(dataUrl, blob) {
         const filename = '邀请函_' + Date.now() + '.png';
         
+        // 如果没有传入 blob，尝试从 window._lastExportBlob 获取
+        if (!blob && window._lastExportBlob) {
+            blob = window._lastExportBlob;
+        }
+        
         // 尝试使用 File System Access API (Android/Chrome)
         if ('showSaveFilePicker' in window) {
             try {
-                const blob = await (await fetch(dataUrl)).blob();
                 const handle = await window.showSaveFilePicker({
                     suggestedName: filename,
                     types: [{
@@ -1893,7 +2069,6 @@
         // 尝试使用 Web Share API (iOS Safari)
         if (navigator.share && navigator.canShare) {
             try {
-                const blob = await (await fetch(dataUrl)).blob();
                 const file = new File([blob], filename, { type: 'image/png' });
                 
                 if (navigator.canShare({ files: [file] })) {
@@ -1952,30 +2127,125 @@
         }
     }
 
-    // 生成画布（所见即所得 - 使用显示尺寸）
+    // 检测是否在微信内置浏览器
-    async function generateCanvas() {
+    function isWechat() {
-        const canvas = exportCanvas;
+        return /MicroMessenger/i.test(navigator.userAgent);
-        const ctx = canvas.getContext('2d');
-        const container = imageContainer;
-
-        const width = container.clientWidth;
-        const height = container.clientHeight;
-
-        canvas.width = width;
-        canvas.height = height;
-
-        ctx.fillStyle = '#fff';
-        ctx.fillRect(0, 0, width, height);
-
-        if (currentImage) {
-            drawBgImageOnCanvas(ctx, currentImage, width, height);
     }
 
-        await drawOverlayImages(ctx);
+    // 生成画布（高清无损，保持与显示容器相同的宽高比）
+    async function generateCanvas() {
+        const canvas = exportCanvas;
+        const container = imageContainer;
 
+        // 获取显示容器的实际尺寸和宽高比
+        const displayWidth = container.clientWidth;
+        const displayHeight = container.clientHeight;
+        const displayRatio = displayWidth / displayHeight;
+        
+        // 根据设备像素比决定输出分辨率，移动端至少 2x
+        const dpr = window.devicePixelRatio || 1;
+        const minScale = Math.max(dpr, 2); // 至少 2x
+        
+        // 先计算目标尺寸
+        let TARGET_WIDTH = Math.round(displayWidth * minScale);
+        let TARGET_HEIGHT = Math.round(displayHeight * minScale);
+        
+        // 微信特殊处理：微信内置浏览器 canvas 限制更严格
+        // 实测微信中 canvas 最大尺寸约为 4096，但超过 2048 可能有问题
+        const MAX_CANVAS_SIZE = isWechat() ? 2048 : 4096;
+        
+        // 如果超出限制，按宽高比等比例缩放
+        if (TARGET_HEIGHT > MAX_CANVAS_SIZE || TARGET_WIDTH > MAX_CANVAS_SIZE) {
+            const maxDimension = Math.max(TARGET_WIDTH, TARGET_HEIGHT);
+            const scaleFactor = MAX_CANVAS_SIZE / maxDimension;
+            TARGET_WIDTH = Math.round(TARGET_WIDTH * scaleFactor);
+            TARGET_HEIGHT = Math.round(TARGET_HEIGHT * scaleFactor);
+        }
+        
+        // 确保最小分辨率，同时保持宽高比
+        const minWidth = 1080;
+        const minHeight = 1920;
+        if (TARGET_WIDTH < minWidth || TARGET_HEIGHT < minHeight) {
+            const widthScale = minWidth / TARGET_WIDTH;
+            const heightScale = minHeight / TARGET_HEIGHT;
+            const scaleFactor = Math.max(widthScale, heightScale);
+            TARGET_WIDTH = Math.round(TARGET_WIDTH * scaleFactor);
+            TARGET_HEIGHT = Math.round(TARGET_HEIGHT * scaleFactor);
+            
+            // 再次检查是否超出限制
+            if (TARGET_HEIGHT > MAX_CANVAS_SIZE || TARGET_WIDTH > MAX_CANVAS_SIZE) {
+                const maxDimension = Math.max(TARGET_WIDTH, TARGET_HEIGHT);
+                const limitScale = MAX_CANVAS_SIZE / maxDimension;
+                TARGET_WIDTH = Math.round(TARGET_WIDTH * limitScale);
+                TARGET_HEIGHT = Math.round(TARGET_HEIGHT * limitScale);
+            }
+        }
+        
+        console.log('目标画布尺寸:', TARGET_WIDTH, 'x', TARGET_HEIGHT, 'dpr:', dpr, '微信:', isWechat());
+        console.log('显示容器尺寸:', displayWidth, 'x', displayHeight);
+        
+        // 临时显示 canvas 以避免浏览器对隐藏 canvas 的尺寸限制
+        canvas.removeAttribute('hidden');
+        canvas.style.position = 'fixed';
+        canvas.style.left = '-9999px';
+        canvas.style.top = '-9999px';
+        
+        // 设置画布为高清分辨率
+        canvas.width = TARGET_WIDTH;
+        canvas.height = TARGET_HEIGHT;
+        
+        // 微信中：验证 canvas 尺寸是否设置成功
+        if (isWechat() && (canvas.width !== TARGET_WIDTH || canvas.height !== TARGET_HEIGHT)) {
+            console.warn('Canvas 尺寸设置失败，使用实际尺寸:', canvas.width, 'x', canvas.height);
+            TARGET_WIDTH = canvas.width;
+            TARGET_HEIGHT = canvas.height;
+        }
+        
+        console.log('实际画布尺寸:', canvas.width, 'x', canvas.height);
+        
+        // 获取 2d 上下文（必须在设置尺寸之后）
+        const ctx = canvas.getContext('2d');
+
+        // 启用最高质量渲染
+        ctx.imageSmoothingEnabled = true;
+        ctx.imageSmoothingQuality = 'high';
+
+        // 白色背景
+        ctx.fillStyle = '#fff';
+        ctx.fillRect(0, 0, TARGET_WIDTH, TARGET_HEIGHT);
+
+        // 计算从显示尺寸到目标分辨率的缩放比例
+        // 使用统一的缩放比例，保持宽高比，确保所见即所得
+        // 注意：必须在 canvas 尺寸验证之后计算 scale
+        const scale = TARGET_WIDTH / displayWidth;
+        console.log('统一缩放比例:', scale, '画布宽高比:', TARGET_WIDTH/TARGET_HEIGHT, '容器宽高比:', displayRatio);
+
+        if (currentImage) {
+            console.log('背景图原始尺寸:', currentImage.naturalWidth, 'x', currentImage.naturalHeight);
+            drawBgImageOnCanvasHD(ctx, currentImage, TARGET_WIDTH, TARGET_HEIGHT, scale);
+        }
+
+        await drawOverlayImagesHD(ctx, scale);
+
+        // 等待所有字体加载完成
+        const fontPromises = [];
         const textInputs = container.querySelectorAll('.preview-input-layer .text-input');
         textInputs.forEach(textInput => {
-            drawTextOnCanvas(ctx, textInput);
+            const style = window.getComputedStyle(textInput);
+            const fontFamily = style.fontFamily.split(',')[0].replace(/['"]/g, '').trim();
+            if (fontFamily && document.fonts) {
+                fontPromises.push(document.fonts.load('16px ' + fontFamily).catch(() => {}));
+            }
+        });
+        
+        // 最多等待 500ms
+        await Promise.race([
+            Promise.all(fontPromises),
+            new Promise(resolve => setTimeout(resolve, 500))
+        ]);
+        
+        textInputs.forEach(textInput => {
+            drawTextOnCanvasHD(ctx, textInput, scale);
         });
 
         return canvas;
@@ -2013,6 +2283,58 @@
         ctx.globalAlpha = 1;
     }
 
+    // 绘制背景图（高清版本）
+    function drawBgImageOnCanvasHD(ctx, img, canvasWidth, canvasHeight, scale) {
+        // 先按显示容器的尺寸计算（与 updateBgImage 完全一致）
+        const displayContainer = imageContainer;
+        const displayWidth = displayContainer.clientWidth;
+        const displayHeight = displayContainer.clientHeight;
+        const imgRatio = img.naturalWidth / img.naturalHeight;
+        const displayRatio = displayWidth / displayHeight;
+        
+        let imgWidth, imgHeight;
+
+        if (imgRatio > displayRatio) {
+            imgHeight = displayHeight;
+            imgWidth = imgHeight * imgRatio;
+        } else {
+            imgWidth = displayWidth;
+            imgHeight = imgWidth / imgRatio;
+        }
+
+        // 应用缩放（与编辑时的 bgImageScale 一致）
+        const scaledWidth = imgWidth * bgImageScale;
+        const scaledHeight = imgHeight * bgImageScale;
+
+        // 计算位置（与 updateBgImage 函数完全一致）
+        const baseLeft = (displayWidth - scaledWidth) / 2;
+        const displayDrawX = baseLeft + imageOffsetX;
+        const displayDrawY = (displayHeight - scaledHeight) / 2;
+        
+        // 将显示坐标转换为 canvas 坐标
+        const drawX = displayDrawX * scale;
+        const drawY = displayDrawY * scale;
+        const canvasScaledWidth = scaledWidth * scale;
+        const canvasScaledHeight = scaledHeight * scale;
+
+        ctx.globalAlpha = bgImageOpacity;
+        
+        // 调试信息
+        console.log('背景图绘制:', {
+            canvas: canvasWidth + 'x' + canvasHeight,
+            scale: scale,
+            displayDrawX: displayDrawX,
+            displayDrawY: displayDrawY,
+            drawX: drawX,
+            drawY: drawY,
+            canvasScaledWidth: canvasScaledWidth,
+            canvasScaledHeight: canvasScaledHeight
+        });
+        
+        ctx.drawImage(img, drawX, drawY, canvasScaledWidth, canvasScaledHeight);
+        ctx.globalAlpha = 1;
+    }
+
     // 绘制层叠图
     function drawOverlayImages(ctx) {
         return new Promise((resolve) => {
@@ -2059,6 +2381,61 @@
         });
     }
 
+    // 绘制层叠图（高清版本）
+    function drawOverlayImagesHD(ctx, scale) {
+        return new Promise((resolve) => {
+            const overlayImages = overlayLayer.querySelectorAll('.overlay-image');
+            if (overlayImages.length === 0) {
+                resolve();
+                return;
+            }
+
+            let loadedCount = 0;
+            const totalImages = overlayImages.length;
+            
+            function checkComplete() {
+                loadedCount++;
+                if (loadedCount >= totalImages) {
+                    resolve();
+                }
+            }
+            
+            overlayImages.forEach(overlayEl => {
+                const imgEl = overlayEl.querySelector('img');
+                if (!imgEl) {
+                    checkComplete();
+                    return;
+                }
+
+                // 使用 offsetLeft/offsetTop 获取相对于 overlayLayer 的位置，并应用统一缩放
+                const left = overlayEl.offsetLeft * scale;
+                const top = overlayEl.offsetTop * scale;
+                const width = overlayEl.offsetWidth * scale;
+                const height = overlayEl.offsetHeight * scale;
+
+                ctx.globalAlpha = overlayEl.style.opacity || 1;
+
+                // 直接使用已加载的图片元素，避免重新加载导致质量下降
+                if (imgEl.complete && imgEl.naturalWidth > 0) {
+                    ctx.drawImage(imgEl, left, top, width, height);
+                    ctx.globalAlpha = 1;
+                    checkComplete();
+                } else {
+                    // 如果图片未加载完成，等待加载
+                    imgEl.onload = () => {
+                        ctx.drawImage(imgEl, left, top, width, height);
+                        ctx.globalAlpha = 1;
+                        checkComplete();
+                    };
+                    imgEl.onerror = () => {
+                        ctx.globalAlpha = 1;
+                        checkComplete();
+                    };
+                }
+            });
+        });
+    }
+
     // 在画布上绘制文字
     function drawTextOnCanvas(ctx, inputElement) {
         const deleteBtn = inputElement.querySelector('.text-delete-btn');
@@ -2088,6 +2465,87 @@
         ctx.fillText(text, inputLeft, inputTop + textOffsetY);
     }
 
+    // 在画布上绘制文字（高清版本）
+    function drawTextOnCanvasHD(ctx, inputElement, scale) {
+        const deleteBtn = inputElement.querySelector('.text-delete-btn');
+        let text = inputElement.textContent;
+        if (deleteBtn) {
+            text = text.replace(deleteBtn.textContent, '');
+        }
+        if (!text.trim()) return;
+
+        // 使用 offsetLeft/offsetTop 获取相对于 preview-input-layer 的位置，并应用统一缩放
+        const inputLeft = inputElement.offsetLeft * scale;
+        const inputTop = inputElement.offsetTop * scale;
+
+        // 强制刷新样式，确保获取最新计算值
+        inputElement.getBoundingClientRect();
+        
+        const style = window.getComputedStyle(inputElement);
+        const originalFontSize = parseInt(style.fontSize);
+        const fontSize = originalFontSize * scale; // 字体大小也按比例缩放
+        
+        // lineHeight 可能是像素值或数字（倍数），需要正确处理
+        let lineHeight = parseFloat(style.lineHeight);
+        // 如果 lineHeight 是数字（小于 10 认为是倍数），转换为像素值
+        if (lineHeight && lineHeight < 10) {
+            lineHeight = lineHeight * originalFontSize * scale;
+        } else if (lineHeight) {
+            // 已经是像素值，按比例缩放
+            lineHeight = lineHeight * scale;
+        }
+        
+        // 处理字体粗细 - 统一转换为标准格式
+        let fontWeight = style.fontWeight;
+        // 数值转换为关键字
+        if (fontWeight === '400' || fontWeight === 'normal') fontWeight = 'normal';
+        else if (fontWeight === '700' || fontWeight === 'bold') fontWeight = 'bold';
+        
+        // 获取斜体样式
+        let fontStyle = style.fontStyle;
+        if (fontStyle === 'oblique') fontStyle = 'italic';
+        else if (fontStyle !== 'italic') fontStyle = 'normal';
+        
+        // 清理字体名称中的引号
+        let fontFamily = style.fontFamily.replace(/['"]/g, '');
+        // 确保字体堆栈有效
+        if (!fontFamily.includes('sans-serif') && !fontFamily.includes('serif') && !fontFamily.includes('monospace')) {
+            fontFamily += ', sans-serif';
+        }
+        
+        // 使用高清字体渲染 - 按标准顺序：style weight size family
+        const fontString = `${fontStyle} ${fontWeight} ${fontSize}px ${fontFamily}`;
+        ctx.font = fontString;
+        ctx.fillStyle = style.color;
+        
+        // 调试：输出实际应用的字体样式
+        console.log('文本绘制样式:', {
+            text: text.substring(0, 10) + (text.length > 10 ? '...' : ''),
+            fontString: fontString,
+            fontSize: fontSize,
+            fontWeight: fontWeight,
+            fontStyle: fontStyle,
+            fontFamily: fontFamily,
+            originalFontFamily: style.fontFamily,
+            color: style.color,
+            actualFont: ctx.font,
+            isWechat: isWechat()
+        });
+        ctx.textBaseline = 'alphabetic';
+        
+        // 微信中：开启文字抗锯齿
+        if (isWechat()) {
+            ctx.textRendering = 'optimizeLegibility';
+        }
+
+        // 计算文本垂直偏移量，使其与 DOM 渲染一致
+        // 使用缩放后的 lineHeight 计算
+        const actualLineHeight = lineHeight || fontSize * 1.4;
+        const textOffsetY = (actualLineHeight - fontSize) / 2 + fontSize * 0.85;
+
+        ctx.fillText(text, inputLeft, inputTop + textOffsetY);
+    }
+
     // 保存图片
     async function saveImage() {
         if (!currentImage) {
@@ -2097,7 +2555,7 @@
 
         try {
             const canvas = await generateCanvas();
-            showMobileSaveTip();
+            await showMobileSaveTip(canvas);
         } catch (err) {
             console.error('保存失败:', err);
             alert('保存失败，请重试');
@@ -2105,11 +2563,63 @@
     }
 
     // 显示移动端保存选项
-    function showMobileSaveTip() {
+    async function showMobileSaveTip(canvas) {
-        const canvas = exportCanvas;
+        console.log('导出画布尺寸:', canvas.width, 'x', canvas.height);
-        const dataUrl = canvas.toDataURL('image/png');
+        
+        // 在 toBlob 之前再次确认 canvas 尺寸
+        console.log('toBlob 前 canvas 尺寸:', canvas.width, 'x', canvas.height);
+        
+        // 微信中使用 toBlob 更稳定，且质量参数 1.0 确保无损
+        let dataUrl;
+        let blob;
+        
+        // 微信中优先使用 toBlob，避免 toDataURL 的内存问题
+        if (isWechat()) {
+            try {
+                blob = await new Promise((resolve, reject) => {
+                    canvas.toBlob((b) => {
+                        if (b) {
+                            console.log('微信 toBlob 成功，blob 尺寸:', b.size, 'bytes');
+                            resolve(b);
+                        } else {
+                            reject(new Error('toBlob 返回 null'));
+                        }
+                    }, 'image/png', 1.0); // 1.0 = 最高质量无损 PNG
+                });
+                dataUrl = URL.createObjectURL(blob);
+            } catch (err) {
+                console.log('微信 toBlob 失败，回退到 toDataURL:', err);
+                dataUrl = canvas.toDataURL('image/png');
+                const response = await fetch(dataUrl);
+                blob = await response.blob();
+            }
+        } else {
+            // 非微信环境，先尝试 toDataURL
+            try {
+                dataUrl = canvas.toDataURL('image/png');
+                console.log('toDataURL 成功，dataUrl 长度:', dataUrl.length);
+                
+                const response = await fetch(dataUrl);
+                blob = await response.blob();
+                console.log('dataUrl 转 blob 成功，blob 尺寸:', blob.size, 'bytes');
+            } catch (err) {
+                console.log('toDataURL 失败，使用 toBlob:', err);
+                blob = await new Promise(resolve => {
+                    canvas.toBlob((b) => {
+                        console.log('toBlob 回调 - blob 尺寸:', b.size, 'bytes');
+                        resolve(b);
+                    }, 'image/png', 1.0);
+                });
+                dataUrl = URL.createObjectURL(blob);
+            }
+        }
+        
+        console.log('导出图片大小:', (blob.size / 1024).toFixed(2), 'KB');
         const filename = '邀请函_' + Date.now() + '.png';
         
+        // 保存 blob 供后续使用
+        window._lastExportBlob = blob;
+
         const tipOverlay = document.createElement('div');
         tipOverlay.id = 'mobileSaveTip';
         tipOverlay.style.cssText = `
@@ -2159,7 +2669,7 @@
         `;
         saveBtn.onclick = async () => {
             tipOverlay.remove();
-            await saveImageToGallery(dataUrl);
+            await saveImageToGallery(dataUrl, blob);
         };
 
         const cancelBtn = document.createElement('button');
@@ -2174,11 +2684,23 @@
             border-radius: 10px;
             cursor: pointer;
         `;
-        cancelBtn.onclick = () => tipOverlay.remove();
+        cancelBtn.onclick = () => {
+            tipOverlay.remove();
+            // 重新隐藏 canvas
+            exportCanvas.setAttribute('hidden', '');
+            exportCanvas.style.position = '';
+            exportCanvas.style.left = '';
+            exportCanvas.style.top = '';
+        };
 
         tipOverlay.addEventListener('click', (e) => {
             if (e.target === tipOverlay) {
                 tipOverlay.remove();
+                // 重新隐藏 canvas
+                exportCanvas.setAttribute('hidden', '');
+                exportCanvas.style.position = '';
+                exportCanvas.style.left = '';
+                exportCanvas.style.top = '';
             }
         });
 
@@ -2204,7 +2726,7 @@
         `;
         previewBtn.onclick = () => {
             tipOverlay.remove();
-            showPreview();
+            showPreviewFromBlob(blob);
         };
 
         // 插入到标题后面