diff --git a/Readme.md b/Readme.md
index 966e421..c2897b4 100644
--- a/Readme.md
+++ b/Readme.md
@@ -8,9 +8,14 @@
 ```js
 ├── Obejct
 │   └── .empty(any)    // 判断对象是否为空对象
+│   └── .groupBy(arr, fn)    // 数组分组, 返回分组后的对象
+│   └── .hasOwn(any, key)    // 安全版的 Object.prototype.hasOwnProperty()
 ├── Obejct.prototype
 │   └── .toParams()    // 把对象转为 key1=value1&key2=value2 格式
 │
+├── Map
+│   └── .groupBy(any)    // 数组分组, 返回分组后的对象
+│
 ├── Array.prototype
 │   ├── .flat(depth)    // 数组降维
 │   ├── .flatMap(fn)    // 等价于 map(fn) -> flat(1)
diff --git a/package.json b/package.json
index b789345..2c24fcb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "es.shim",
-  "version": "2.2.1",
+  "version": "2.2.2",
   "description": "实现部分新API, 以及一些常用的扩展方法",
   "keyworks": [
     "es5",
diff --git a/src/index.mjs b/src/index.mjs
index 6d7c911..c4dd4c6 100644
--- a/src/index.mjs
+++ b/src/index.mjs
@@ -4,8 +4,9 @@
  * @date 2022/01/27 15:33:09
  */
 
-import './lib/object.js'
 import './lib/array.js'
+import './lib/object.js'
+import './lib/map.js'
 import './lib/string.js'
 import './lib/number.js'
 import './lib/date.js'
diff --git a/src/lib/map.js b/src/lib/map.js
new file mode 100644
index 0000000..bea7cf7
--- /dev/null
+++ b/src/lib/map.js
@@ -0,0 +1,13 @@
+/**
+ * {}
+ * @author yutent<yutent.io@gmail.com>
+ * @date 2024/03/28 18:48:08
+ */
+
+if (!Map.groupBy) {
+  Object.defineProperty(Map, 'groupBy', {
+    value: function (arr, fn) {
+      return arr.groupToMap(fn)
+    }
+  })
+}
diff --git a/src/lib/object.js b/src/lib/object.js
index 293935c..e4430cf 100644
--- a/src/lib/object.js
+++ b/src/lib/object.js
@@ -21,6 +21,25 @@ if (!Object.empty) {
   })
 }
 
+if (!Object.groupBy) {
+  Object.defineProperty(Object, 'groupBy', {
+    value: function (arr, fn) {
+      return arr.group(fn)
+    }
+  })
+}
+
+if (!Object.hasOwn) {
+  Object.defineProperty(Object, 'hasOwn', {
+    value: function (obj, key) {
+      if (obj === null) {
+        return false
+      }
+      return obj.hasOwnProperty(key)
+    }
+  })
+}
+
 /**
  * 将对象转为url参数字符串
  * 注意: 这里不会处理复杂类型, 直接按toString结果拼接