diff --git a/lib/client.js b/lib/client.js
index e4ad0486..8b00ab46 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -109,7 +109,7 @@ var Util, DOM, CloudFunc, join;
                     }
                 }
                 
-                isContain = Util.isContainStr(path, '.js');
+                isContain   = /\.js/.test(path);
                 
                 if (!isContain)
                     path += '.js';