feat(label): enable darkMode

src/echarts.ts

@@ -1327,6 +1327,7 @@ class ECharts extends Eventful {
 
                 // Set background
                 let backgroundColor = ecModel.get('backgroundColor') || 'transparent';
+                const darkMode = ecModel.get('darkMode');
 
                 // In IE8
                 if (!env.canvasSupported) {
@@ -1338,6 +1339,11 @@ class ECharts extends Eventful {
                 }
                 else {
                     zr.setBackgroundColor(backgroundColor);
+
+                    // Force set dark mode.
+                    if (darkMode != null && darkMode !== 'auto') {
+                        zr.setDarkMode(darkMode);
+                    }
                 }
 
                 performPostUpdateFuncs(ecModel, api);

src/model/globalDefault.ts

@@ -25,6 +25,8 @@ if (typeof navigator !== 'undefined') {
 }
 
 export default {
+
+    darkMode: 'auto',
     // backgroundColor: 'rgba(0,0,0,0)',
 
     // https://dribbble.com/shots/1065960-Infographic-Pie-chart-visualization

src/theme/dark.ts

@@ -54,6 +54,8 @@ const colorPalette = [
     '#eedd78', '#73a373', '#73b9bc', '#7289ab', '#91ca8c', '#f49f42'
 ];
 const theme = {
+    darkMode: true,
+
     color: colorPalette,
     backgroundColor: '#333',
     tooltip: {