update

html/sw.js

@@ -23,36 +23,37 @@ self.addEventListener('install', event => {
     );
 });
 
-self.addEventListener('fetch', function(evt) {
-  console.log('The service worker is serving the asset.');
-  evt.respondWith(fromNetwork(evt.request, 15000).catch(function () {
-      return fromCache(evt.request);
-  }));
+self.addEventListener('fetch', function (evt) {
+    console.log('The service worker is serving the asset.');
+    evt.respondWith(fromNetwork(evt.request, 15000).catch(function () {
+        return fromCache(evt.request);
+    }));
 });
 
 function precache() {
-  return caches.open(CACHE).then(function (cache) {
-      return cache.addAll([
-          './controlled.html',
-          './asset'
-      ]);
-  });
+    return caches.open(CACHE).then(function (cache) {
+        return cache.addAll([
+            './controlled.html',
+            './asset'
+        ]);
+    });
 }
 
 function fromNetwork(request, timeout) {
-  return new Promise(function (fulfill, reject) {
-      var timeoutId = setTimeout(reject, timeout);
-      fetch(request).then(function (response) {
-          clearTimeout(timeoutId);
-          fulfill(response);
-      }, reject);
-  });
+    return new Promise(function (fulfill, reject) {
+        var timeoutId = setTimeout(reject, timeout);
+        fetch(request).then(function (response) {
+            clearTimeout(timeoutId);
+            fulfill(response);
+        }, reject);
+    });
 }
 
 function fromCache(request) {
-  return caches.open(CACHE).then(function (cache) {
-      return cache.match(request).then(function (matching) {
-          return matching || Promise.reject('no-match');
-      });
-  });
+    return caches.open(CACHE).then(function (cache) {
+        return cache.match(request).then(function (matching) {
+            return matching || Promise.reject('no-match');
+        });
+    });
 }
+