update

html/sw.js

@@ -30,15 +30,6 @@ self.addEventListener('fetch', function (evt) {
     }));
 });
 
-function precache() {
-    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);