前端初始化

node_modules/zrender/src/config.ts

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+import env from './core/env';
+
+let dpr = 1;
+
+// If in browser environment
+if (env.hasGlobalWindow) {
+    dpr = Math.max(
+        window.devicePixelRatio
+        || (window.screen && (window.screen as any).deviceXDPI / (window.screen as any).logicalXDPI)
+        || 1, 1
+    );
+}
+
+/**
+ * Debug log mode:
+ * 0: Do nothing, for release.
+ * 1: console.error, for debug.
+ */
+export const debugMode = 0;
+
+// retina 屏幕优化
+export const devicePixelRatio = dpr;
+
+
+/**
+ * Determine when to turn on dark mode based on the luminance of backgroundColor
+ */
+export const DARK_MODE_THRESHOLD = 0.4;
+
+/**
+ * Color of default dark label.
+ */
+export const DARK_LABEL_COLOR = '#333';
+
+/**
+ * Color of default light label.
+ */
+export const LIGHT_LABEL_COLOR = '#ccc';
+
+/**
+ * Color of default light label.
+ */
+export const LIGHTER_LABEL_COLOR = '#eee';