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				@@ -39,14 +39,14 @@ export function createRouterGuards(router: Router) { 
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				         : ('音乐数字课堂' as string);
 
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				     }
 
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				-    // if ('serviceWorker' in navigator) {
 
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				-    //   console.log(caches.keys(), 'caches.keys()');
 
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				-    //   caches.keys().then(function (cacheNames) {
 
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				-    //     cacheNames.forEach(function (cacheName) {
 
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				-    //       caches.delete(cacheName);
 
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				-    //     });
 
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				-    //   });
 
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				-    // }
 
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				+    if ('serviceWorker' in navigator) {
 
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				+      // console.log(caches.keys(), 'caches.keys()');
 
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				+      caches.keys().then(function (cacheNames) {
 
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				+        cacheNames.forEach(function (cacheName) {
 
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				+          caches.delete(cacheName);
 
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				+        });
 
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				+      });
 
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				+    }
 
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				     if (!isChrome()) {
 
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				       return;
 
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				     }
 
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