资源本地化

public/js/app.js

@@ -153,6 +153,24 @@
   let myMap2D = null;
   let editingRouteId = null;
 
+  async function fetchJsonWithFallback(urls) {
+    let lastError = null;
+
+    for (const url of urls) {
+      try {
+        const response = await fetch(url, { cache: 'force-cache' });
+        if (!response.ok) {
+          throw new Error(`HTTP ${response.status}`);
+        }
+        return await response.json();
+      } catch (err) {
+        lastError = err;
+      }
+    }
+
+    throw lastError || new Error('All JSON sources failed');
+  }
+
   // ---- Initialize ----
   function init() {
     // Resource Gauges Time
@@ -752,9 +770,10 @@
     }
 
     try {
-      // Fetch map data
-      const resp = await fetch('https://cdn.jsdelivr.net/npm/echarts@4.9.0/map/json/world.json');
-      const worldJSON = await resp.json();
+      // Fetch map data with CDN fallback so restricted networks degrade more gracefully.
+      const worldJSON = await fetchJsonWithFallback([
+        '/vendor/world.json'
+      ]);
 
       // Transform to Pacific-centered correctly
       const transformCoords = (coords) => {
@@ -865,6 +884,8 @@
       }
     } catch (err) {
       console.error('[Map2D] Initialization failed:', err);
+      dom.globeContainer.innerHTML = '<div class="chart-empty">Map data unavailable</div>';
+      myMap2D = null;
     }
   }