feat: 新增添加文本功能，支持多文本；fix: 修复保存预览失败

js/script.js

@@ -3,6 +3,7 @@
     const fileInput = document.getElementById('fileInput');
     const addImageBtn = document.getElementById('addImageBtn');
     const addOverlayBtn = document.getElementById('addOverlayBtn');
+    const addTextBtn = document.getElementById('addTextBtn');
     const saveBtn = document.getElementById('saveBtn');
     const imageContainer = document.getElementById('imageContainer');
     const bgLayer = document.getElementById('bgLayer');
@@ -64,6 +65,11 @@
             overlayInput.value = '';
         });
 
+        // 添加文本按钮
+        addTextBtn.addEventListener('click', () => {
+            addTextInput();
+        });
+
         // 文件选择
         fileInput.addEventListener('change', (e) => {
             const file = e.target.files[0];
@@ -179,6 +185,30 @@
         reader.readAsDataURL(file);
     }
 
+    // 添加文本输入框
+    function addTextInput() {
+        const container = imageContainer;
+        const containerWidth = container.clientWidth;
+        const containerHeight = container.clientHeight;
+
+        const textEl = document.createElement('div');
+        textEl.className = 'text-input';
+        textEl.contentEditable = 'false';
+        textEl.textContent = '新文本';
+
+        const left = Math.random() * (containerWidth * 0.6) + containerWidth * 0.1;
+        const top = Math.random() * (containerHeight * 0.6) + containerHeight * 0.1;
+        textEl.style.left = (left / containerWidth * 100) + '%';
+        textEl.style.top = (top / containerHeight * 100) + '%';
+
+        const inputLayer = container.querySelector('.preview-input-layer');
+        inputLayer.appendChild(textEl);
+
+        initInput(textEl);
+
+        selectInput(textEl);
+    }
+
     // 加载层叠图
     function loadOverlayImage(file) {
         const reader = new FileReader();
@@ -1543,9 +1573,10 @@
     async function generateCanvas() {
         const canvas = exportCanvas;
         const ctx = canvas.getContext('2d');
+        const container = imageContainer;
 
-        const containerWidth = imageContainer.clientWidth;
-        const containerHeight = imageContainer.clientHeight;
+        const containerWidth = container.clientWidth;
+        const containerHeight = container.clientHeight;
 
         canvas.width = containerWidth;
         canvas.height = containerHeight;
@@ -1562,9 +1593,11 @@
         // 绘制层叠图（等待图片加载完成）
         await drawOverlayImages(ctx);
 
-        // 绘制文字
-        drawTextOnCanvas(ctx, input1);
-        drawTextOnCanvas(ctx, input2);
+        // 绘制文字（动态获取所有文本输入框）
+        const textInputs = container.querySelectorAll('.preview-input-layer .text-input');
+        textInputs.forEach(textInput => {
+            drawTextOnCanvas(ctx, textInput);
+        });
 
         return canvas;
     }