diff --git a/change_cdn.py b/change_cdn.py
new file mode 100644
index 00000000..312074b9
--- /dev/null
+++ b/change_cdn.py
@@ -0,0 +1,20 @@
+#!/usr/bin/python
+
+
+import os
+
+
+def iter(path):
+    for root, dirs, files in os.walk(path):
+        for fn in files:
+            if fn.endswith(".html"):
+                with open(root + '/' + fn, 'r') as f:
+                    content = f.read()
+                content = content.replace('<script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/ace.js"></script>', '<script src="http://cdn.bootcss.com/ace/1.1.3/ace.js"></script>').replace('<script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.1.3/mode-javascript.js"></script>', '<script src="http://cdn.bootcss.com/ace/1.1.3/mode-javascript.js"></script>')
+                insert_pos = content.find("</li>", content.find("Generated using GitBook")) + 6
+                content = content[:insert_pos] + '''<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
+  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>''' + content[insert_pos:]
+                with open(root + '/' + fn, 'w') as f:
+                    f.write(content)
+
+iter(os.getcwd())
diff --git a/chapter1/README.html b/chapter1/README.html
index d0b49f03..416597ee 100644
--- a/chapter1/README.html
+++ b/chapter1/README.html
@@ -187,7 +187,8 @@
         <li>
             <a href="http://www.gitbook.io/" target="blank" class="gitbook-link">Generated using GitBook</a>
         </li>
-        
+<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
+  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>        
     </ul>
 </div>
 
diff --git a/chapter1/a_swift_tour.html b/chapter1/a_swift_tour.html
index 21ea9eaf..3c05d8e8 100644
--- a/chapter1/a_swift_tour.html
+++ b/chapter1/a_swift_tour.html
@@ -187,7 +187,8 @@
         <li>
             <a href="http://www.gitbook.io/" target="blank" class="gitbook-link">Generated using GitBook</a>
         </li>
-        
+<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
+  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>        
     </ul>
 </div>
 
diff --git a/chapter1/swift.html b/chapter1/swift.html
index 83dd3b8f..caed71a8 100644
--- a/chapter1/swift.html
+++ b/chapter1/swift.html
@@ -187,7 +187,8 @@
         <li>
             <a href="http://www.gitbook.io/" target="blank" class="gitbook-link">Generated using GitBook</a>
         </li>
-        
+<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
+  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>        
     </ul>
 </div>
 
diff --git a/chapter2/article_1.html b/chapter2/article_1.html
index 399a6557..1cf811fc 100644
--- a/chapter2/article_1.html
+++ b/chapter2/article_1.html
@@ -185,7 +185,8 @@
         <li>
             <a href="http://www.gitbook.io/" target="blank" class="gitbook-link">Generated using GitBook</a>
         </li>
-        
+<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
+  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>        
     </ul>
 </div>
 
diff --git a/chapter2/the_basics.html b/chapter2/the_basics.html
index 86f92ead..ad685e37 100644
--- a/chapter2/the_basics.html
+++ b/chapter2/the_basics.html
@@ -187,7 +187,8 @@
         <li>
             <a href="http://www.gitbook.io/" target="blank" class="gitbook-link">Generated using GitBook</a>
         </li>
-        
+<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
+  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>        
     </ul>
 </div>
 
diff --git a/gitbook/jsrepl/sandbox.html b/gitbook/jsrepl/sandbox.html
index b04282e7..3a5703c9 100755
--- a/gitbook/jsrepl/sandbox.html
+++ b/gitbook/jsrepl/sandbox.html
@@ -1,4 +1,5 @@
-<!DOCTYPE html>
+<!DOC<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
+  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>TYPE html>
 <html>
   <head>
    <title>jsREPL Sandbox</title>
diff --git a/index.html b/index.html
index d8f2c32a..41f5d35a 100644
--- a/index.html
+++ b/index.html
@@ -81,6 +81,7 @@
     </span>
 
     <!-- Actions Right -->
+
     
     <a href="#" target="_blank" class="btn pull-right google-plus-sharing-link sharing-link" data-sharing="google-plus" aria-label="Share on Google Plus"><i class="fa fa-google-plus"></i></a>
     
@@ -185,6 +186,8 @@
         <li>
             <a href="http://www.gitbook.io/" target="blank" class="gitbook-link">Generated using GitBook</a>
         </li>
+<li style="margin-left:15%;"> <iframe  src="http://ghbtns.com/github-btn.html?user=numbbbbb&repo=the-swift-programming-language-in-chinese&type=watch&count=true&size=large"
+  allowtransparency="true" frameborder="0" scrolling="0" width="170" height="30"></iframe></li>     
         
     </ul>
 </div>