diff --git a/changelog.md b/changelog.md
index 4555f53da..ead4d92ef 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,6 @@
 # 更新日志
 2.0(2020-07)
+- BI.OB的on方法返回一个解除监听的函数
 - 修复了grid_view执行_unMount时不调用子组件的_unMount的问题
 - combo新增belowMouse属性,允许popup在点击处弹出
 - combo新增hideWhenAnotherComboOpen属性,开启则其他combo下拉时当前combo收起
diff --git a/src/core/ob.js b/src/core/ob.js
index ed8ac8744..9dc8b9959 100644
--- a/src/core/ob.js
+++ b/src/core/ob.js
@@ -1,5 +1,5 @@
 !(function () {
-    function extend () {
+    function extend() {
         var target = arguments[0] || {}, length = arguments.length, i = 1, options, name, src, copy;
         for (; i < length; i++) {
             // Only deal with non-null/undefined values
@@ -86,8 +86,8 @@
         },
 
         _getEvents: function () {
-            if (!_.isArray(this.events)) {
-                this.events = [];
+            if (!_.isObject(this.events)) {
+                this.events = {};
             }
             return this.events;
         },
@@ -98,6 +98,7 @@
          * @param {Function} fn 事件对应的执行函数
          */
         on: function (eventName, fn) {
+            var self = this;
             eventName = eventName.toLowerCase();
             var fns = this._getEvents()[eventName];
             if (!_.isArray(fns)) {
@@ -105,6 +106,10 @@
                 this._getEvents()[eventName] = fns;
             }
             fns.push(fn);
+
+            return function () {
+                self.un(eventName, fn);
+            };
         },
 
         /**
@@ -148,7 +153,7 @@
          */
         purgeListeners: function () {
             /* alex:清空events*/
-            this.events = [];
+            this.events = {};
         },
         /**
          * 触发绑定过的事件
diff --git a/typescript/core/inject.ts b/typescript/core/inject.ts
new file mode 100644
index 000000000..3852fe442
--- /dev/null
+++ b/typescript/core/inject.ts
@@ -0,0 +1,47 @@
+type _module = (xtype: string, cls: any) => void;
+type _constant = (xtype: string, cls: any) => void;
+type _model = (xtype: string, cls: any) => void;
+type _store = (xtype: string, cls: any) => void;
+type _service = (xtype: string, cls: any) => void;
+type _provider = (xtype: string, cls: any) => void;
+
+interface _modules {
+    getModule: (type: string) => any;
+    getAllModules: () => any;
+}
+
+interface _constants {
+    getConstant: (type: string) => any;
+}
+
+interface _models {
+    getModel: (type: string, options?: any) => any;
+}
+
+interface _stores {
+    getStore: (type: string, options?: any) => any;
+}
+
+interface _providers {
+    getProvider: (type: string, options?: any) => any;
+}
+
+interface _services {
+    getService: (type: string, options?: any) => any;
+}
+
+
+export type _inject = {
+    module: _module;
+    constant: _constant;
+    model: _model;
+    store: _store;
+    provider: _provider;
+    service: _service;
+    Modules: _modules;
+    Constants: _constants;
+    Models: _models;
+    Stores: _stores;
+    Providers: _providers;
+    Services: _services;
+}
diff --git a/typescript/core/ob.ts b/typescript/core/ob.ts
index 16ce71024..88f89968e 100644
--- a/typescript/core/ob.ts
+++ b/typescript/core/ob.ts
@@ -19,7 +19,7 @@ export interface _OB {
 
     _getEvents(): { [eventName: string]: Function[] };
 
-    on(eventName: string, fn: Function): void;
+    on(eventName: string, fn: Function): Function;
 
     once(eventName: string, fn: Function): void;
 
diff --git a/typescript/index.ts b/typescript/index.ts
index a9243f40c..ed9f79215 100644
--- a/typescript/index.ts
+++ b/typescript/index.ts
@@ -36,6 +36,7 @@ import { _i18n } from "./core/i18n";
 import { _Plugin } from "./core/plugin";
 import { _OB } from "./core/ob";
 import { _Widget, _WidgetStatic } from "./core/widget";
+import { _inject } from "./core/inject";
 import { _Layout } from "./core/wrapper/layout";
 import { _AbsoluteLayout } from "./core/wrapper/layout/layout.absolute";
 import { _HTapeLayout, _VTapeLayout } from "./core/wrapper/layout/layout.tape";
@@ -49,9 +50,9 @@ type ClassConstructor<T extends {}> = T & {
     readonly prototype: T;
 }
 
-export interface BI extends _func, _i18n, _base {
+export interface BI extends _func, _i18n, _base, _inject {
     OB: ClassConstructor<_OB>;
-    Plugin:_Plugin;
+    Plugin: _Plugin;
     Widget: ClassConstructor<_Widget> & _WidgetStatic;
     Single: ClassConstructor<_Single>;
     BasicButton: ClassConstructor<_BasicButton> & _BasicButtonStatic;