改进 service worker

serviceWorkerAppend.js

@@ -16,25 +16,25 @@ console.log("sw printing after chrome58StopHere ", stop);
 if (!stop) {
   self.addEventListener("fetch", event => {
     // Prevent the default, and handle the request ourselves.
-    event.respondWith(
-      (async function() {
-        // console.log("fetch intercepted");
-        // Try to get the response from a cache.
-        const cachedResponse = await caches.match(event.request);
-        // Return it if we found one.
-        if (cachedResponse) {
-          console.log("cache res", event.request.url);
-          return cachedResponse;
-        }
+    if (
+      event.request.url.startsWith(
+        "https://ecs-test-static.qmth.com.cn/comm-ques-bank/dev/audio"
+      ) ||
+      event.request.url.startsWith(
+        "https://ecs-static.qmth.com.cn/comm-ques-bank/prod/audio/"
+      )
+    ) {
+      event.respondWith(
+        (async function() {
+          // console.log("fetch intercepted");
+          // Try to get the response from a cache.
+          const cachedResponse = await caches.match(event.request);
+          // Return it if we found one.
+          if (cachedResponse) {
+            console.log("cache res", event.request.url);
+            return cachedResponse;
+          }
 
-        if (
-          event.request.url.startsWith(
-            "https://ecs-test-static.qmth.com.cn/comm-ques-bank/dev/audio"
-          ) ||
-          event.request.url.startsWith(
-            "https://ecs-static.qmth.com.cn/comm-ques-bank/prod/audio/"
-          )
-        ) {
           console.log("fetch audio intercept, try to load all");
           const res = await fetch(event.request.url);
 
@@ -46,18 +46,6 @@ if (!stop) {
           if (contentLength === 0) {
             return fetch(event.request);
           }
-          // console.log("content-length", contentLength);
-          // self.sessionStorage.setItem("test-sw", "1");
-          // self.postMessage({
-          //   url: event.request.url,
-          //   progress: 1,
-          // });
-
-          // self.addEventListener('message', function(event){
-          //   console.log("SW Received Message: " + event.data);
-          // console.log(event);
-          // event.ports[0].postMessage("SW Says 'Hello back!'");
-          // });
 
           // Step 3: read the data
           let receivedLength = 0; // received that many bytes at the moment
@@ -111,11 +99,11 @@ if (!stop) {
           });
 
           return responseFinal.clone();
-        }
-        // If we didn't find a match in the cache, use the network.
-        return fetch(event.request);
-      })()
-    );
+          // If we didn't find a match in the cache, use the network.
+          // return fetch(event.request);
+        })()
+      );
+    }
   });
 }
 console.log("sw printing end");