diff --git a/changelog.md b/changelog.md
index 5857959e2..d0dbaf2c1 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,6 @@
 # 更新日志
 2.0(2020-05)
+- 新增BI.after和BI.before方法
 - 修复bi.button设置宽度并配置iconCls后，文本很长的情况下显示截断的问题
 - 填加bi-user-select-enable和bi-user-select-disable通用类名
 - 修复树系列多层半选状态下,勾选祖先节点,后代节点不受影响的问题
diff --git a/lodash.md b/lodash.md
index 585e74b43..8eff925dc 100644
--- a/lodash.md
+++ b/lodash.md
@@ -1 +1 @@
-lodash core plus="debounce,throttle,get,set,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy,union,zipObject,initial,cloneDeep,clamp,isPlainObject,take,takeRight,without,difference,defaultsDeep,trim,merge,groupBy,uniqBy"
\ No newline at end of file
+lodash core plus="debounce,throttle,get,set,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy,union,zipObject,initial,cloneDeep,clamp,isPlainObject,take,takeRight,without,difference,defaultsDeep,trim,merge,groupBy,uniqBy,before,after"
diff --git a/src/core/base.js b/src/core/base.js
index df0c6017a..e073da354 100644
--- a/src/core/base.js
+++ b/src/core/base.js
@@ -109,7 +109,7 @@ if (!_global.BI) {
                 }
                 if (item.el instanceof BI.Widget || (BI.View && item.el instanceof BI.View)) {
                     innerAttr.shift();
-                    return BI.extend({}, outerAttr.shift(), {type: null}, item);
+                    return BI.extend({}, outerAttr.shift(), { type: null }, item);
                 }
                 if (item.el) {
                     return BI.extend({}, outerAttr.shift(), item, {
@@ -508,7 +508,7 @@ if (!_global.BI) {
         },
 
         isNull: function (obj) {
-            return typeof  obj === "undefined" || obj === null;
+            return typeof obj === "undefined" || obj === null;
         },
 
         isEmptyArray: function (arr) {
@@ -660,7 +660,7 @@ if (!_global.BI) {
     });
 
     // 通用方法
-    _.each(["uniqueId", "result", "chain", "iteratee", "escape", "unescape"], function (name) {
+    _.each(["uniqueId", "result", "chain", "iteratee", "escape", "unescape", "before", "after"], function (name) {
         BI[name] = function () {
             return _[name].apply(_, arguments);
         };
diff --git a/src/core/lodash.js b/src/core/lodash.js
index 39a72d4aa..95d7a53e4 100644
--- a/src/core/lodash.js
+++ b/src/core/lodash.js
@@ -1,7 +1,7 @@
 /**
  * @license
  * Lodash (Custom Build) <https://lodash.com/>
- * Build: `lodash core plus="debounce,throttle,get,set,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy,union,zipObject,initial,cloneDeep,clamp,isPlainObject,take,takeRight,without,difference,defaultsDeep,trim,merge,groupBy,uniqBy"`
+ * Build: `lodash core plus="debounce,throttle,get,set,findIndex,findLastIndex,findKey,findLastKey,isArrayLike,invert,invertBy,uniq,uniqBy,omit,omitBy,zip,unzip,rest,range,random,reject,intersection,drop,countBy,union,zipObject,initial,cloneDeep,clamp,isPlainObject,take,takeRight,without,difference,defaultsDeep,trim,merge,groupBy,uniqBy,before,after"`
  * Copyright JS Foundation and other contributors <https://js.foundation/>
  * Released under MIT license <https://lodash.com/license>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -6994,6 +6994,42 @@
 
   /*------------------------------------------------------------------------*/
 
+  /**
+   * The opposite of `_.before`; this method creates a function that invokes
+   * `func` once it's called `n` or more times.
+   *
+   * @static
+   * @memberOf _
+   * @since 0.1.0
+   * @category Function
+   * @param {number} n The number of calls before `func` is invoked.
+   * @param {Function} func The function to restrict.
+   * @returns {Function} Returns the new restricted function.
+   * @example
+   *
+   * var saves = ['profile', 'settings'];
+   *
+   * var done = _.after(saves.length, function() {
+   *   console.log('done saving!');
+   * });
+   *
+   * _.forEach(saves, function(type) {
+   *   asyncSave({ 'type': type, 'complete': done });
+   * });
+   * // => Logs 'done saving!' after the two async saves have completed.
+   */
+  function after(n, func) {
+    if (typeof func != 'function') {
+      throw new TypeError(FUNC_ERROR_TEXT);
+    }
+    n = toInteger(n);
+    return function() {
+      if (--n < 1) {
+        return func.apply(this, arguments);
+      }
+    };
+  }
+
   /**
    * Creates a function that invokes `func`, with the `this` binding and arguments
    * of the created function, while it's called less than `n` times. Subsequent
@@ -9824,6 +9860,7 @@
   /*------------------------------------------------------------------------*/
 
   // Add methods that return wrapped values in chain sequences.
+  lodash.after = after;
   lodash.assignIn = assignIn;
   lodash.before = before;
   lodash.bind = bind;