diff --git a/src/core/base.js b/src/core/base.js
index e073da354b..20a57bd309 100644
--- a/src/core/base.js
+++ b/src/core/base.js
@@ -3,7 +3,7 @@
  * Create By GUY 2014\11\17
  *
  */
-var _global;
+_global = undefined;
 if (typeof window !== "undefined") {
     _global = window;
 } else if (typeof global !== "undefined") {
diff --git a/src/core/foundation.js b/src/core/foundation.js
index e8555e32e0..067178cbd5 100644
--- a/src/core/foundation.js
+++ b/src/core/foundation.js
@@ -4,7 +4,7 @@
 /**
  * 初始化BI对象
  */
-var _global;
+_global = undefined;
 if (typeof window !== "undefined") {
     _global = window;
 } else if (typeof global !== "undefined") {
diff --git a/src/third/jquery.mousewheel.js b/src/third/jquery.mousewheel.js
index 23d4648adb..557fe35e43 100644
--- a/src/third/jquery.mousewheel.js
+++ b/src/third/jquery.mousewheel.js
@@ -7,16 +7,18 @@
  */
 
 (function (factory) {
-    if ( typeof define === "function" && define.amd ) {
-        // AMD. Register as an anonymous module.
-        define(["../core/jquery"], factory);
-    } else if (typeof exports === "object") {
-        // Node/CommonJS style for Browserify
-        module.exports = factory;
-    } else {
-        // Browser globals
-        factory(BI.jQuery);
-    }
+    // Browser globals
+    factory(BI.jQuery);
+    // if ( typeof define === "function" && define.amd ) {
+    //     // AMD. Register as an anonymous module.
+    //     define(["../core/jquery"], factory);
+    // } else if (typeof exports === "object") {
+    //     // Node/CommonJS style for Browserify
+    //     module.exports = factory;
+    // } else {
+    //     // Browser globals
+    //     factory(BI.jQuery);
+    // }
 }(function ($) {
 
     var toFix  = ["wheel", "mousewheel", "DOMMouseScroll", "MozMousePixelScroll"],