diff --git a/docs/pwa.md b/docs/pwa.md
index 98ff6302..7cf0200f 100644
--- a/docs/pwa.md
+++ b/docs/pwa.md
@@ -17,17 +17,18 @@ Create a sw.js file in your documents root directory and copy this code.
  * Register service worker.
  * ========================================================== */
 
-const RUNTIME = 'docsify';
+const RUNTIME = 'docsify'
 const HOSTNAME_WHITELIST = [
   self.location.hostname,
   'fonts.gstatic.com',
-  'fonts.googleapis.com'
+  'fonts.googleapis.com',
+  'unpkg.com'
 ]
 
 // The Util Function to hack URLs of intercepted requests
 const getFixedUrl = (req) => {
-  var now = Date.now();
-  url = new URL(req.url)
+  var now = Date.now()
+  var url = new URL(req.url)
 
   // 1. fixed http URL
   // Just keep syncing with location.protocol
@@ -40,7 +41,9 @@ const getFixedUrl = (req) => {
   // max-age on mutable content is error-prone, with SW life of bugs can even extend.
   // Until cache mode of Fetch API landed, we have to workaround cache-busting with query string.
   // Cache-Control-Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=453190
-  url.search += (url.search ? '&' : '?') + 'cache-bust=' + now;
+  if (url.hostname === self.location.hostname) {
+    url.search += (url.search ? '&' : '?') + 'cache-bust=' + now
+  }
   return url.href
 }
 
@@ -50,16 +53,15 @@ const getFixedUrl = (req) => {
  *
  *  waitUntil(): activating ====> activated
  */
-self.addEventListener('activate',  event => {
-  event.waitUntil(self.clients.claim());
-});
-
+self.addEventListener('activate', event => {
+  event.waitUntil(self.clients.claim())
+})
 
 /**
  *  @Functional Fetch
  *  All network requests are being intercepted here.
  *
- *  void respondWith(Promise<Response> r);
+ *  void respondWith(Promise<Response> r)
  */
 self.addEventListener('fetch', event => {
   // Skip some of cross-origin requests, like those for Google Analytics.
@@ -67,10 +69,10 @@ self.addEventListener('fetch', event => {
     // Stale-while-revalidate
     // similar to HTTP's stale-while-revalidate: https://www.mnot.net/blog/2007/12/12/stale
     // Upgrade from Jake's to Surma's: https://gist.github.com/surma/eb441223daaedf880801ad80006389f1
-    const cached = caches.match(event.request);
-    const fixedUrl = getFixedUrl(event.request);
-    const fetched = fetch(fixedUrl, {cache: 'no-store'});
-    const fetchedCopy = fetched.then(resp => resp.clone());
+    const cached = caches.match(event.request)
+    const fixedUrl = getFixedUrl(event.request)
+    const fetched = fetch(fixedUrl, { cache: 'no-store' })
+    const fetchedCopy = fetched.then(resp => resp.clone())
 
     // Call respondWith() with whatever we get first.
     // If the fetch fails (e.g disconnected), wait for the cache.
@@ -79,17 +81,17 @@ self.addEventListener('fetch', event => {
     event.respondWith(
       Promise.race([fetched.catch(_ => cached), cached])
         .then(resp => resp || fetched)
-        .catch(_ => {/* eat any errors */})
-    );
+        .catch(_ => { /* eat any errors */ })
+    )
 
     // Update the cache with the version we fetched (only for ok status)
     event.waitUntil(
       Promise.all([fetchedCopy, caches.open(RUNTIME)])
         .then(([response, cache]) => response.ok && cache.put(event.request, response))
-        .catch(_ => {/* eat any errors */})
-    );
+        .catch(_ => { /* eat any errors */ })
+    )
   }
-});
+})
 ```
 
 ## Register
diff --git a/docs/sw.js b/docs/sw.js
index 1c6757fd..1e4aaeb7 100644
--- a/docs/sw.js
+++ b/docs/sw.js
@@ -6,17 +6,18 @@
  * Register service worker.
  * ========================================================== */
 
-const RUNTIME = 'docsify';
+const RUNTIME = 'docsify'
 const HOSTNAME_WHITELIST = [
   self.location.hostname,
   'fonts.gstatic.com',
-  'fonts.googleapis.com'
+  'fonts.googleapis.com',
+  'unpkg.com'
 ]
 
 // The Util Function to hack URLs of intercepted requests
 const getFixedUrl = (req) => {
-  var now = Date.now();
-  url = new URL(req.url)
+  var now = Date.now()
+  var url = new URL(req.url)
 
   // 1. fixed http URL
   // Just keep syncing with location.protocol
@@ -29,7 +30,9 @@ const getFixedUrl = (req) => {
   // max-age on mutable content is error-prone, with SW life of bugs can even extend.
   // Until cache mode of Fetch API landed, we have to workaround cache-busting with query string.
   // Cache-Control-Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=453190
-  url.search += (url.search ? '&' : '?') + 'cache-bust=' + now;
+  if (url.hostname === self.location.hostname) {
+    url.search += (url.search ? '&' : '?') + 'cache-bust=' + now
+  }
   return url.href
 }
 
@@ -39,16 +42,15 @@ const getFixedUrl = (req) => {
  *
  *  waitUntil(): activating ====> activated
  */
-self.addEventListener('activate',  event => {
-  event.waitUntil(self.clients.claim());
-});
-
+self.addEventListener('activate', event => {
+  event.waitUntil(self.clients.claim())
+})
 
 /**
  *  @Functional Fetch
  *  All network requests are being intercepted here.
  *
- *  void respondWith(Promise<Response> r);
+ *  void respondWith(Promise<Response> r)
  */
 self.addEventListener('fetch', event => {
   // Skip some of cross-origin requests, like those for Google Analytics.
@@ -56,10 +58,10 @@ self.addEventListener('fetch', event => {
     // Stale-while-revalidate
     // similar to HTTP's stale-while-revalidate: https://www.mnot.net/blog/2007/12/12/stale
     // Upgrade from Jake's to Surma's: https://gist.github.com/surma/eb441223daaedf880801ad80006389f1
-    const cached = caches.match(event.request);
-    const fixedUrl = getFixedUrl(event.request);
-    const fetched = fetch(fixedUrl, {cache: 'no-store'});
-    const fetchedCopy = fetched.then(resp => resp.clone());
+    const cached = caches.match(event.request)
+    const fixedUrl = getFixedUrl(event.request)
+    const fetched = fetch(fixedUrl, { cache: 'no-store' })
+    const fetchedCopy = fetched.then(resp => resp.clone())
 
     // Call respondWith() with whatever we get first.
     // If the fetch fails (e.g disconnected), wait for the cache.
@@ -68,14 +70,14 @@ self.addEventListener('fetch', event => {
     event.respondWith(
       Promise.race([fetched.catch(_ => cached), cached])
         .then(resp => resp || fetched)
-        .catch(_ => {/* eat any errors */})
-    );
+        .catch(_ => { /* eat any errors */ })
+    )
 
     // Update the cache with the version we fetched (only for ok status)
     event.waitUntil(
       Promise.all([fetchedCopy, caches.open(RUNTIME)])
         .then(([response, cache]) => response.ok && cache.put(event.request, response))
-        .catch(_ => {/* eat any errors */})
-    );
+        .catch(_ => { /* eat any errors */ })
+    )
   }
-});
+})
diff --git a/docs/zh-cn/pwa.md b/docs/zh-cn/pwa.md
index 7eb7ac65..f8d03ff5 100644
--- a/docs/zh-cn/pwa.md
+++ b/docs/zh-cn/pwa.md
@@ -17,17 +17,18 @@
  * Register service worker.
  * ========================================================== */
 
-const RUNTIME = 'docsify';
+const RUNTIME = 'docsify'
 const HOSTNAME_WHITELIST = [
   self.location.hostname,
   'fonts.gstatic.com',
-  'fonts.googleapis.com'
+  'fonts.googleapis.com',
+  'unpkg.com'
 ]
 
 // The Util Function to hack URLs of intercepted requests
 const getFixedUrl = (req) => {
-  var now = Date.now();
-  url = new URL(req.url)
+  var now = Date.now()
+  var url = new URL(req.url)
 
   // 1. fixed http URL
   // Just keep syncing with location.protocol
@@ -40,7 +41,9 @@ const getFixedUrl = (req) => {
   // max-age on mutable content is error-prone, with SW life of bugs can even extend.
   // Until cache mode of Fetch API landed, we have to workaround cache-busting with query string.
   // Cache-Control-Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=453190
-  url.search += (url.search ? '&' : '?') + 'cache-bust=' + now;
+  if (url.hostname === self.location.hostname) {
+    url.search += (url.search ? '&' : '?') + 'cache-bust=' + now
+  }
   return url.href
 }
 
@@ -50,16 +53,15 @@ const getFixedUrl = (req) => {
  *
  *  waitUntil(): activating ====> activated
  */
-self.addEventListener('activate',  event => {
-  event.waitUntil(self.clients.claim());
-});
-
+self.addEventListener('activate', event => {
+  event.waitUntil(self.clients.claim())
+})
 
 /**
  *  @Functional Fetch
  *  All network requests are being intercepted here.
  *
- *  void respondWith(Promise<Response> r);
+ *  void respondWith(Promise<Response> r)
  */
 self.addEventListener('fetch', event => {
   // Skip some of cross-origin requests, like those for Google Analytics.
@@ -67,10 +69,10 @@ self.addEventListener('fetch', event => {
     // Stale-while-revalidate
     // similar to HTTP's stale-while-revalidate: https://www.mnot.net/blog/2007/12/12/stale
     // Upgrade from Jake's to Surma's: https://gist.github.com/surma/eb441223daaedf880801ad80006389f1
-    const cached = caches.match(event.request);
-    const fixedUrl = getFixedUrl(event.request);
-    const fetched = fetch(fixedUrl, {cache: 'no-store'});
-    const fetchedCopy = fetched.then(resp => resp.clone());
+    const cached = caches.match(event.request)
+    const fixedUrl = getFixedUrl(event.request)
+    const fetched = fetch(fixedUrl, { cache: 'no-store' })
+    const fetchedCopy = fetched.then(resp => resp.clone())
 
     // Call respondWith() with whatever we get first.
     // If the fetch fails (e.g disconnected), wait for the cache.
@@ -79,17 +81,17 @@ self.addEventListener('fetch', event => {
     event.respondWith(
       Promise.race([fetched.catch(_ => cached), cached])
         .then(resp => resp || fetched)
-        .catch(_ => {/* eat any errors */})
-    );
+        .catch(_ => { /* eat any errors */ })
+    )
 
     // Update the cache with the version we fetched (only for ok status)
     event.waitUntil(
       Promise.all([fetchedCopy, caches.open(RUNTIME)])
         .then(([response, cache]) => response.ok && cache.put(event.request, response))
-        .catch(_ => {/* eat any errors */})
-    );
+        .catch(_ => { /* eat any errors */ })
+    )
   }
-});
+})
 ```
 
 ## 注册