version bump 1.21.0

- 数据标签颜色：默认自动取系列颜色(柱状/折线色)，也可选自定义颜色手动指定
- Y轴范围：默认自动计算，可手动指定最小/最大值；双Y轴时左/右轴可分别指定
- 主图 + 多图合并 + 服务端API 三处统一；收藏保存/恢复含两项设置
- API 新增参数 labelColorMode/labelColor, yAxisMin/yAxisMax, leftAxisMin/Max, rightAxisMin/Max

README.md

@@ -3,7 +3,7 @@
 一个简洁强大的数据可视化工具，支持 **Web UI** 和 **API** 两种方式生成精美的对比图表和表格图片。
 
 ![License](https://img.shields.io/badge/license-MIT-blue.svg)
-![Version](https://img.shields.io/badge/version-1.19.0-green.svg)
+![Version](https://img.shields.io/badge/version-1.20.0-green.svg)
 
 ## ✨ 功能特性
 
@@ -15,6 +15,8 @@
 - **雷达图** - 多维度对比（第一列=维度，每个系列=一个多边形）
 - **双Y轴** - 一张图左右两个坐标轴，量度可不同，左右轴可独立命名，系列可指定左轴/右轴且每种类型独立设置（柱状/折线）；开启双轴时**图例放在各自轴上方、各自往两边对齐**（左轴系列图例靠左、右轴系列图例靠右，附「左轴/右轴」分组标题），不再占用两侧空白区，绘图区占满整图宽度；**图例图标随系列类型自动变化**（柱状=方块、折线=线条）；**左右轴标题显示方式可选**（竖直显示/轴上部横排）
 - **系列样式细分** - 每个系列可单独设置图表类型与样式：**柱状**分实体/空心/阴影，**折线**分实线/虚线/点线，图例与样式联动
+- **数据标签颜色** - 显示数据标签时颜色**默认同系列颜色**（柱状/折线色），也可手动指定自定义颜色
+- **Y轴范围** - 默认自动计算，也可**手动指定 Y 轴最小/最大值**；双Y轴时左轴、右轴可分别指定范围
 - **X轴设置** - 横坐标轴名**默认自动取数据首列字段名**，**默认放在横坐标轴下方居中**（也可选右侧末端）；选轴名时自动预留空间不再截字；刻度文字方向**默认水平(0°)**，支持**下拉档位(每10°)** + **手动输入任意度数(0-90°)**，解决长类别名重叠问题
 - **数据方向（行=系列）** - 支持"行=系列"布局：第一行是横坐标，每行一个系列，每行可独立设置图表类型（柱状/折线）与左右轴量度（如：营收行=柱状左轴，销量行=折线右轴）
 

app.js

@@ -302,6 +302,25 @@ function updateChart() {
     const xAxisNameLoc = document.getElementById('xAxisNameLoc').value;
     const xLabelRotate = xLabelRotateValue();
 
+    // 数据标签颜色：auto=同系列颜色 / custom=手动指定
+    const labelColorMode = (document.getElementById('labelColorMode') || {}).value || 'auto';
+    const labelColor = (document.getElementById('labelColor') || {}).value || '#333333';
+    // Y轴范围（留空=自动）
+    const yAxisMin = (document.getElementById('yAxisMin') || {}).value;
+    const yAxisMax = (document.getElementById('yAxisMax') || {}).value;
+    const leftAxisMin = (document.getElementById('leftAxisMin') || {}).value;
+    const leftAxisMax = (document.getElementById('leftAxisMax') || {}).value;
+    const rightAxisMin = (document.getElementById('rightAxisMin') || {}).value;
+    const rightAxisMax = (document.getElementById('rightAxisMax') || {}).value;
+
+    // 显示/隐藏：数据标签颜色 + 单/双轴范围输入
+    const lcGroup = document.getElementById('labelColorGroup');
+    if (lcGroup) lcGroup.style.display = showLabel ? 'block' : 'none';
+    const singleR = document.getElementById('singleAxisRange');
+    const dualR = document.getElementById('dualAxisRange');
+    if (singleR) singleR.style.display = dualAxis ? 'none' : 'block';
+    if (dualR) dualR.style.display = dualAxis ? 'block' : 'none';
+
     // 饼图/雷达图：走专用构建逻辑（无坐标轴/网格，不支持双轴/堆叠/分割）
     if (chartType === 'pie' || chartType === 'radar') {
         const option = buildPieRadarOption(chartType);
@@ -383,13 +402,13 @@ function updateChart() {
         const styleOv = window.seriesStyleOverrides && window.seriesStyleOverrides[origIdx];
         applySeriesStyle(seriesItem, type, color, styleOv);
 
-        // 数据标签
+        // 数据标签：颜色默认同系列颜色，可手动自定义
         if (showLabel) {
             seriesItem.label = {
                 show: true,
                 position: type === 'bar' ? 'top' : 'top',
                 fontSize: 11,
-                color: textColor,
+                color: labelColorMode === 'custom' ? labelColor : color,
                 formatter: (params) => {
                     if (params.value >= 10000) return (params.value / 10000).toFixed(1) + 'w';
                     if (params.value >= 1000) return (params.value / 1000).toFixed(1) + 'k';
@@ -599,6 +618,8 @@ function updateChart() {
             {
                 type: 'value',
                 name: leftAxisName || '左轴',
+                min: axisNum(leftAxisMin),
+                max: axisNum(leftAxisMax),
                 nameLocation: leftAxisNameLoc === 'top' ? 'end' : 'middle',
                 nameRotate: leftAxisNameLoc === 'top' ? 0 : 90,
                 nameGap: leftAxisNameLoc === 'top' ? 12 : 32,
@@ -615,6 +636,8 @@ function updateChart() {
                 type: 'value',
                 name: rightAxisName || '右轴',
                 position: 'right',
+                min: axisNum(rightAxisMin),
+                max: axisNum(rightAxisMax),
                 nameLocation: rightAxisNameLoc === 'top' ? 'end' : 'middle',
                 nameRotate: rightAxisNameLoc === 'top' ? 0 : 90,
                 nameGap: rightAxisNameLoc === 'top' ? 12 : 32,
@@ -626,6 +649,8 @@ function updateChart() {
             }
         ] : {
             type: 'value',
+            min: axisNum(yAxisMin),
+            max: axisNum(yAxisMax),
             axisLine: { show: false },
             axisTick: { show: false },
             axisLabel: { color: textColor, fontSize: 11 },
@@ -844,6 +869,10 @@ function updateSeriesStyle(origIdx, style) {
 function onDualAxisChange() {
     const on = document.getElementById('dualAxis').checked;
     document.getElementById('rightAxisGroup').style.display = on ? 'block' : 'none';
+    const singleR = document.getElementById('singleAxisRange');
+    const dualR = document.getElementById('dualAxisRange');
+    if (singleR) singleR.style.display = on ? 'none' : 'block';
+    if (dualR) dualR.style.display = on ? 'block' : 'none';
     renderSeriesConfig(); // 显示/隐藏系列轴选择
     updateChart();
 }
@@ -954,6 +983,20 @@ function setXAxisNameDefault(firstField) {
     }
 }
 
+// Y轴 min/max：空值或非法返回 undefined（走 ECharts 自动）
+function axisNum(v) {
+    if (v === '' || v === undefined || v === null) return undefined;
+    const n = parseFloat(v);
+    return isNaN(n) ? undefined : n;
+}
+
+// 数据标签颜色模式切换：auto=同系列颜色 / custom=自定义色
+function onLabelColorModeChange() {
+    const colorInput = document.getElementById('labelColor');
+    if (colorInput) colorInput.style.display = document.getElementById('labelColorMode').value === 'custom' ? 'block' : 'none';
+    updateChart();
+}
+
 function adjustColor(hex, amount) {
     hex = hex.replace('#', '');
     const num = parseInt(hex, 16);
@@ -1390,6 +1433,8 @@ function buildCombineChartOption(dataText, cfg) {
         stackMode = false, smoothLine = true,
         dualYAxis = false, leftAxisName = '', rightAxisName = '', seriesConfig = null,
         leftAxisNameLoc = 'vertical', rightAxisNameLoc = 'vertical',
+        labelColorMode = 'auto', labelColor = '#333333',
+        yAxisMin = '', yAxisMax = '', leftAxisMin = '', leftAxisMax = '', rightAxisMin = '', rightAxisMax = '',
         xAxisName = '', xAxisNameLoc = 'middle', xLabelRotate = 0, width = 600
     } = cfg;
 
@@ -1505,7 +1550,7 @@ function buildCombineChartOption(dataText, cfg) {
                 show: true,
                 position: 'top',
                 fontSize: 11,
-                color: textColor,
+                color: labelColorMode === 'custom' ? labelColor : color,
                 formatter: (p) => {
                     if (p.value >= 10000) return (p.value / 10000).toFixed(1) + 'w';
                     if (p.value >= 1000) return (p.value / 1000).toFixed(1) + 'k';
@@ -1612,6 +1657,8 @@ function buildCombineChartOption(dataText, cfg) {
             {
                 type: 'value',
                 name: leftAxisName || '左轴',
+                min: axisNum(leftAxisMin),
+                max: axisNum(leftAxisMax),
                 nameLocation: leftAxisNameLoc === 'top' ? 'end' : 'middle',
                 nameRotate: leftAxisNameLoc === 'top' ? 0 : 90,
                 nameGap: leftAxisNameLoc === 'top' ? 12 : 30,
@@ -1625,6 +1672,8 @@ function buildCombineChartOption(dataText, cfg) {
                 type: 'value',
                 name: rightAxisName || '右轴',
                 position: 'right',
+                min: axisNum(rightAxisMin),
+                max: axisNum(rightAxisMax),
                 nameLocation: rightAxisNameLoc === 'top' ? 'end' : 'middle',
                 nameRotate: rightAxisNameLoc === 'top' ? 0 : 90,
                 nameGap: rightAxisNameLoc === 'top' ? 12 : 30,
@@ -1636,6 +1685,8 @@ function buildCombineChartOption(dataText, cfg) {
             }
         ] : {
             type: 'value',
+            min: axisNum(yAxisMin),
+            max: axisNum(yAxisMax),
             axisLine: { show: false },
             axisTick: { show: false },
             axisLabel: { color: textColor, fontSize: 11 },
@@ -1658,7 +1709,7 @@ function measureCombineChart(dataText, rowsAsSeries) {
 let combineCharts = [];
 
 function defaultCombineChart() {
-    return { title: '', type: 'bar', theme: 'default', legend: true, grid: true, label: false, stack: false, data: '', rowsAsSeries: false, dualYAxis: false, leftAxisName: '', rightAxisName: '', leftAxisNameLoc: 'vertical', rightAxisNameLoc: 'vertical', seriesConfig: [], xAxisName: '', xAxisNameLoc: 'middle', xLabelRotate: 0 };
+    return { title: '', type: 'bar', theme: 'default', legend: true, grid: true, label: false, stack: false, data: '', rowsAsSeries: false, dualYAxis: false, leftAxisName: '', rightAxisName: '', leftAxisNameLoc: 'vertical', rightAxisNameLoc: 'vertical', labelColorMode: 'auto', labelColor: '#333333', yAxisMin: '', yAxisMax: '', leftAxisMin: '', leftAxisMax: '', rightAxisMin: '', rightAxisMax: '', seriesConfig: [], xAxisName: '', xAxisNameLoc: 'middle', xLabelRotate: 0 };
 }
 
 function initCombineCharts() {
@@ -1713,6 +1764,35 @@ function renderCombineCharts() {
                     <label><input type="checkbox" ${c.rowsAsSeries ? 'checked' : ''} onchange="updateCombineChart(${i},'rowsAsSeries',this.checked)"> 行=系列</label>
                 </div>
             </div>
+            <div class="config-group">
+                <label>数据标签颜色（默认同系列颜色）</label>
+                <div class="res-input-row">
+                    <select onchange="updateCombineChart(${i},'labelColorMode',this.value)" style="flex:1">
+                        <option value="auto" ${(c.labelColorMode || 'auto') === 'auto' ? 'selected' : ''}>自动（同系列颜色）</option>
+                        <option value="custom" ${c.labelColorMode === 'custom' ? 'selected' : ''}>自定义…</option>
+                    </select>
+                    <input type="color" value="${c.labelColor || '#333333'}" style="width:44px;height:32px" onchange="updateCombineChart(${i},'labelColor',this.value)">
+                </div>
+            </div>
+            <div class="config-group">
+                <label>Y轴范围（留空=自动）</label>
+                ${c.dualYAxis ? `
+                <div class="res-input-row">
+                    <input type="number" value="${escHtml(c.leftAxisMin)}" placeholder="左轴最小" oninput="updateCombineChart(${i},'leftAxisMin',this.value)">
+                    <span class="res-times">~</span>
+                    <input type="number" value="${escHtml(c.leftAxisMax)}" placeholder="左轴最大" oninput="updateCombineChart(${i},'leftAxisMax',this.value)">
+                </div>
+                <div class="res-input-row" style="margin-top:6px">
+                    <input type="number" value="${escHtml(c.rightAxisMin)}" placeholder="右轴最小" oninput="updateCombineChart(${i},'rightAxisMin',this.value)">
+                    <span class="res-times">~</span>
+                    <input type="number" value="${escHtml(c.rightAxisMax)}" placeholder="右轴最大" oninput="updateCombineChart(${i},'rightAxisMax',this.value)">
+                </div>` : `
+                <div class="res-input-row">
+                    <input type="number" value="${escHtml(c.yAxisMin)}" placeholder="最小值" oninput="updateCombineChart(${i},'yAxisMin',this.value)">
+                    <span class="res-times">~</span>
+                    <input type="number" value="${escHtml(c.yAxisMax)}" placeholder="最大值" oninput="updateCombineChart(${i},'yAxisMax',this.value)">
+                </div>`}
+            </div>
             <div class="config-group">
                 <label><input type="checkbox" ${c.dualYAxis ? 'checked' : ''} onchange="updateCombineChart(${i},'dualYAxis',this.checked)"> 双Y轴（不同左右量度）</label>
             </div>
@@ -1940,6 +2020,10 @@ function generateCombine() {
             rowsAsSeries: !!c.rowsAsSeries,
             dualYAxis: !!c.dualYAxis, leftAxisName: c.leftAxisName || '', rightAxisName: c.rightAxisName || '',
             leftAxisNameLoc: c.leftAxisNameLoc || 'vertical', rightAxisNameLoc: c.rightAxisNameLoc || 'vertical',
+            labelColorMode: c.labelColorMode || 'auto', labelColor: c.labelColor || '#333333',
+            yAxisMin: c.yAxisMin !== undefined ? c.yAxisMin : '', yAxisMax: c.yAxisMax !== undefined ? c.yAxisMax : '',
+            leftAxisMin: c.leftAxisMin !== undefined ? c.leftAxisMin : '', leftAxisMax: c.leftAxisMax !== undefined ? c.leftAxisMax : '',
+            rightAxisMin: c.rightAxisMin !== undefined ? c.rightAxisMin : '', rightAxisMax: c.rightAxisMax !== undefined ? c.rightAxisMax : '',
             xAxisName: c.xAxisName || '', xAxisNameLoc: c.xAxisNameLoc || 'middle', xLabelRotate: parseInt(c.xLabelRotate) || 0,
             seriesConfig: c.seriesConfig, width: w
         });
@@ -2111,6 +2195,14 @@ function collectChartConfig() {
         rightAxisName: document.getElementById('rightAxisName').value,
         leftAxisNameLoc: (document.getElementById('leftAxisNameLoc') || {}).value || 'vertical',
         rightAxisNameLoc: (document.getElementById('rightAxisNameLoc') || {}).value || 'vertical',
+        labelColorMode: (document.getElementById('labelColorMode') || {}).value || 'auto',
+        labelColor: (document.getElementById('labelColor') || {}).value || '#333333',
+        yAxisMin: (document.getElementById('yAxisMin') || {}).value || '',
+        yAxisMax: (document.getElementById('yAxisMax') || {}).value || '',
+        leftAxisMin: (document.getElementById('leftAxisMin') || {}).value || '',
+        leftAxisMax: (document.getElementById('leftAxisMax') || {}).value || '',
+        rightAxisMin: (document.getElementById('rightAxisMin') || {}).value || '',
+        rightAxisMax: (document.getElementById('rightAxisMax') || {}).value || '',
         xAxisName: document.getElementById('xAxisName').value,
         xAxisNameLoc: document.getElementById('xAxisNameLoc').value,
         xLabelRotate: xLabelRotateValue(),
@@ -2325,6 +2417,17 @@ function applyFavoriteConfig(fav) {
         const rNameLoc = document.getElementById('rightAxisNameLoc');
         if (lNameLoc) lNameLoc.value = cfg.leftAxisNameLoc || 'vertical';
         if (rNameLoc) rNameLoc.value = cfg.rightAxisNameLoc || 'vertical';
+        const lcMode = document.getElementById('labelColorMode');
+        const lcColor = document.getElementById('labelColor');
+        if (lcMode) lcMode.value = cfg.labelColorMode || 'auto';
+        if (lcColor) lcColor.value = cfg.labelColor || '#333333';
+        if (lcColor) lcColor.style.display = (cfg.labelColorMode || 'auto') === 'custom' ? 'block' : 'none';
+        document.getElementById('yAxisMin').value = cfg.yAxisMin || '';
+        document.getElementById('yAxisMax').value = cfg.yAxisMax || '';
+        document.getElementById('leftAxisMin').value = cfg.leftAxisMin || '';
+        document.getElementById('leftAxisMax').value = cfg.leftAxisMax || '';
+        document.getElementById('rightAxisMin').value = cfg.rightAxisMin || '';
+        document.getElementById('rightAxisMax').value = cfg.rightAxisMax || '';
         document.getElementById('xAxisName').value = cfg.xAxisName || '';
         document.getElementById('xAxisNameLoc').value = cfg.xAxisNameLoc || 'middle';
         xAxisNameTouched = true; // 收藏恢复时尊重已存轴名，不再自动覆盖

index.html

@@ -155,6 +155,40 @@ C, 20, 30, 40</pre>
                         </div>
                     </div>
 
+                    <div class="config-group" id="labelColorGroup" style="display:none;">
+                        <label>数据标签颜色（默认同系列颜色）</label>
+                        <div class="res-input-row">
+                            <select id="labelColorMode" onchange="onLabelColorModeChange()" style="flex:1">
+                                <option value="auto" selected>自动（同系列颜色）</option>
+                                <option value="custom">自定义…</option>
+                            </select>
+                            <input type="color" id="labelColor" value="#333333" style="width:44px;height:32px;display:none" onchange="updateChart()">
+                        </div>
+                    </div>
+
+                    <div class="config-group">
+                        <label>Y轴范围（留空=自动）</label>
+                        <div id="singleAxisRange">
+                            <div class="res-input-row">
+                                <input type="number" id="yAxisMin" placeholder="最小值" oninput="updateChart()">
+                                <span class="res-times">~</span>
+                                <input type="number" id="yAxisMax" placeholder="最大值" oninput="updateChart()">
+                            </div>
+                        </div>
+                        <div id="dualAxisRange" style="display:none;">
+                            <div class="res-input-row">
+                                <input type="number" id="leftAxisMin" placeholder="左轴最小" oninput="updateChart()">
+                                <span class="res-times">~</span>
+                                <input type="number" id="leftAxisMax" placeholder="左轴最大" oninput="updateChart()">
+                            </div>
+                            <div class="res-input-row" style="margin-top:8px">
+                                <input type="number" id="rightAxisMin" placeholder="右轴最小" oninput="updateChart()">
+                                <span class="res-times">~</span>
+                                <input type="number" id="rightAxisMax" placeholder="右轴最大" oninput="updateChart()">
+                            </div>
+                        </div>
+                    </div>
+
                     <div class="config-group" id="rightAxisGroup" style="display:none;">
                         <label>左右轴名称（量度可不同）</label>
                         <div class="res-input-row">

server.js

@@ -152,6 +152,13 @@ function applySeriesStyle(seriesItem, type, color, style) {
     }
 }
 
+// Y轴 min/max：空值/非法返回 undefined（ECharts 自动）
+function axisNum(v) {
+    if (v === '' || v === undefined || v === null) return undefined;
+    const n = parseFloat(v);
+    return isNaN(n) ? undefined : n;
+}
+
 function buildChartOption(params) {
     const {
         data,
@@ -178,6 +185,17 @@ function buildChartOption(params) {
         seriesStyles = null,
         leftAxisNameLoc = 'vertical',
         rightAxisNameLoc = 'vertical',
+        labelColorMode = 'auto',
+        labelColor = '#333333',
+        yAxisMin = '',
+        yAxisMax = '',
+        leftAxisMin = '',
+        leftAxisMax = '',
+        rightAxisMin = '',
+        rightAxisMax = '',
+        xLabelRotate = '',
+        xLabelInterval = '',
+        xLabelFontSize = 0,
         width = 800
     } = params;
 
@@ -315,12 +333,13 @@ function buildChartOption(params) {
         const st = Array.isArray(seriesStyles) ? seriesStyles[idx] : null;
         applySeriesStyle(seriesItem, type, color, st);
 
+        // 数据标签：颜色默认同系列颜色，可手动自定义
         if (showLabel) {
             seriesItem.label = {
                 show: true,
                 position: 'top',
                 fontSize: 11,
-                color: textColor,
+                color: labelColorMode === 'custom' ? labelColor : color,
                 formatter: (p) => {
                     if (p.value >= 10000) return (p.value / 10000).toFixed(1) + 'w';
                     if (p.value >= 1000) return (p.value / 1000).toFixed(1) + 'k';
@@ -460,9 +479,11 @@ function buildChartOption(params) {
             axisLine: { lineStyle: { color: axisLineColor } },
             axisLabel: {
                 color: textColor,
-                fontSize: 12,
+                fontSize: xLabelFontSize > 0 ? xLabelFontSize : 12,
-                interval: 0,
+                interval: xLabelInterval === '' ? 0 : Number(xLabelInterval),
-                rotate: parsedData.categories.length > 10 ? 30 : 0
+                rotate: xLabelRotate === ''
+                    ? (parsedData.categories.length > 10 ? 30 : 0)
+                    : Number(xLabelRotate)
             },
             axisTick: { show: false }
         },
@@ -470,6 +491,8 @@ function buildChartOption(params) {
             {
                 type: 'value',
                 name: leftAxisName || '左轴',
+                min: axisNum(leftAxisMin),
+                max: axisNum(leftAxisMax),
                 nameLocation: leftAxisNameLoc === 'top' ? 'end' : 'middle',
                 nameRotate: leftAxisNameLoc === 'top' ? 0 : 90,
                 nameGap: leftAxisNameLoc === 'top' ? 12 : 32,
@@ -489,6 +512,8 @@ function buildChartOption(params) {
                 type: 'value',
                 name: rightAxisName || '右轴',
                 position: 'right',
+                min: axisNum(rightAxisMin),
+                max: axisNum(rightAxisMax),
                 nameLocation: rightAxisNameLoc === 'top' ? 'end' : 'middle',
                 nameRotate: rightAxisNameLoc === 'top' ? 0 : 90,
                 nameGap: rightAxisNameLoc === 'top' ? 12 : 32,
@@ -500,6 +525,8 @@ function buildChartOption(params) {
             }
         ] : {
             type: 'value',
+            min: axisNum(yAxisMin),
+            max: axisNum(yAxisMax),
             axisLine: { show: false },
             axisTick: { show: false },
             axisLabel: { color: textColor, fontSize: 11 },
@@ -604,6 +631,14 @@ app.get('/api/chart', (req, res) => {
             seriesStyles: req.query.seriesStyles ? req.query.seriesStyles.split(',') : null,
             leftAxisNameLoc: req.query.leftAxisNameLoc || 'vertical',
             rightAxisNameLoc: req.query.rightAxisNameLoc || 'vertical',
+            labelColorMode: req.query.labelColorMode || 'auto',
+            labelColor: req.query.labelColor || '#333333',
+            yAxisMin: req.query.yAxisMin || '',
+            yAxisMax: req.query.yAxisMax || '',
+            leftAxisMin: req.query.leftAxisMin || '',
+            leftAxisMax: req.query.leftAxisMax || '',
+            rightAxisMin: req.query.rightAxisMin || '',
+            rightAxisMax: req.query.rightAxisMax || '',
             rowsAsSeries: req.query.rowsAsSeries === 'true',
             width: parseInt(req.query.width) || 800,
             height: parseInt(req.query.height) || 500,
@@ -1121,7 +1156,7 @@ app.get('/api/health', (req, res) => {
     res.json({
         status: 'ok',
         service: 'data-chart-tool',
-        version: '1.19.0',
+        version: '1.21.0',
         endpoints: {
             'POST /api/chart': '生成图表图片（JSON body）',
             'GET /api/chart': '生成图表图片（URL 参数）',
@@ -1141,7 +1176,7 @@ app.get('/api/health', (req, res) => {
 app.get('/api/docs', (req, res) => {
     res.json({
         name: '数据可视化图表生成器 API',
-        version: '1.19.0',
+        version: '1.21.0',
         endpoints: [
             {
                 method: 'POST',
@@ -1176,6 +1211,14 @@ app.get('/api/docs', (req, res) => {
                     seriesStyles: { type: 'array', default: null, description: '每系列样式（如 ["solid","dashed"]，柱状支持 solid实体/hollow空心/shadow阴影，折线支持 solid实线/dashed虚线/dotted点线）' },
                     leftAxisNameLoc: { type: 'string', default: 'vertical', options: ['vertical', 'top'], description: '左轴标题显示方式：vertical=竖直显示(默认)，top=轴上部横排' },
                     rightAxisNameLoc: { type: 'string', default: 'vertical', options: ['vertical', 'top'], description: '右轴标题显示方式：vertical=竖直显示(默认)，top=轴上部横排' },
+                    labelColorMode: { type: 'string', default: 'auto', options: ['auto', 'custom'], description: '数据标签颜色：auto=同系列颜色(默认)，custom=手动指定 labelColor' },
+                    labelColor: { type: 'string', default: '#333333', description: '数据标签自定义颜色（labelColorMode=custom 时生效）' },
+                    yAxisMin: { type: 'string', default: '', description: '单Y轴最小值（留空=自动）' },
+                    yAxisMax: { type: 'string', default: '', description: '单Y轴最大值（留空=自动）' },
+                    leftAxisMin: { type: 'string', default: '', description: '双Y轴左轴最小值（留空=自动）' },
+                    leftAxisMax: { type: 'string', default: '', description: '双Y轴左轴最大值（留空=自动）' },
+                    rightAxisMin: { type: 'string', default: '', description: '双Y轴右轴最小值（留空=自动）' },
+                    rightAxisMax: { type: 'string', default: '', description: '双Y轴右轴最大值（留空=自动）' },
                     rowsAsSeries: { type: 'boolean', default: false, description: '数据方向：false=列=系列（第一列是横坐标，每列一个系列）；true=行=系列（第一行是横坐标，每行一个系列）' }
                 },
                 returns: 'image/png',