Fixing the issue4860. Escaping the embedded '"' in the js_output method of Morsel class.

Lib/http/cookies.py

@@ -392,7 +392,7 @@ class Morsel(dict):
         document.cookie = \"%s\";
         // end hiding -->
         </script>
-        """ % ( self.OutputString(attrs), )
+        """ % ( self.OutputString(attrs).replace('"',r'\"'))
     # end js_output()
 
     def OutputString(self, attrs=None):

Lib/test/test_http_cookies.py

@@ -50,17 +50,17 @@ class CookieTests(unittest.TestCase):
 
         self.assertEqual(C.output(['path']),
             'Set-Cookie: Customer="WILE_E_COYOTE"; Path=/acme')
-        self.assertEqual(C.js_output(), """
+        self.assertEqual(C.js_output(), r"""
         <script type="text/javascript">
         <!-- begin hiding
-        document.cookie = "Customer="WILE_E_COYOTE"; Path=/acme; Version=1";
+        document.cookie = "Customer=\"WILE_E_COYOTE\"; Path=/acme; Version=1";
         // end hiding -->
         </script>
         """)
-        self.assertEqual(C.js_output(['path']), """
+        self.assertEqual(C.js_output(['path']), r"""
         <script type="text/javascript">
         <!-- begin hiding
-        document.cookie = "Customer="WILE_E_COYOTE"; Path=/acme";
+        document.cookie = "Customer=\"WILE_E_COYOTE\"; Path=/acme";
         // end hiding -->
         </script>
         """)