diff --git a/src/base/single/input/file.js b/src/base/single/input/file.js
index 50ec58bdc..802e8472f 100644
--- a/src/base/single/input/file.js
+++ b/src/base/single/input/file.js
@@ -97,7 +97,7 @@
             split = "onabort.onerror.onloadstart.onprogress".split("."),
             length = split.length,
             CRLF = "\r\n",
-            xhr = this.XMLHttpRequest ? new XMLHttpRequest : new ActiveXObject("Microsoft.XMLHTTP"),
+            xhr = XMLHttpRequest ? new XMLHttpRequest : new ActiveXObject("Microsoft.XMLHTTP"),
             sendFile;
 
         // FireFox 3+, Safari 4 beta (Chrome 2 beta file is buggy and will not work)
diff --git a/src/core/0.foundation.js b/src/core/0.foundation.js
index 067178cbd..ea69e97a9 100644
--- a/src/core/0.foundation.js
+++ b/src/core/0.foundation.js
@@ -4,7 +4,7 @@
 /**
  * 初始化BI对象
  */
-_global = undefined;
+var _global = undefined;
 if (typeof window !== "undefined") {
     _global = window;
 } else if (typeof global !== "undefined") {
@@ -14,6 +14,11 @@ if (typeof window !== "undefined") {
 } else {
     _global = this;
 }
+
+if (_global) {
+    _global._global = _global;
+}
+
 if (_global.BI == null) {
     _global.BI = {prepares: []};
 }
diff --git a/src/core/2.base.js b/src/core/2.base.js
index 16a4a9f70..4a2a2df68 100644
--- a/src/core/2.base.js
+++ b/src/core/2.base.js
@@ -3,20 +3,6 @@
  * Create By GUY 2014\11\17
  *
  */
-_global = undefined;
-if (typeof window !== "undefined") {
-    _global = window;
-} else if (typeof global !== "undefined") {
-    _global = global;
-} else if (typeof self !== "undefined") {
-    _global = self;
-} else {
-    _global = this;
-}
-if (!_global.BI) {
-    _global.BI = {};
-}
-
 !(function (undefined) {
     var traverse = function (func, context) {
         return function (value, key, obj) {