diff --git a/package.json b/package.json
index 2d08a01..7de42b9 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@winner-fed/cloud-utils",
   "description": "A collection of utils by winner fed",
-  "version": "1.1.3",
+  "version": "1.1.4",
   "author": {
     "name": "cloudbroker",
     "email": "cloudbroker@163.com"
diff --git a/src/core/is.js b/src/core/is.js
index ada2c1f..8139263 100644
--- a/src/core/is.js
+++ b/src/core/is.js
@@ -1,93 +1,176 @@
 const toString = Object.prototype.toString;
 
+/**
+ * 判断类型的 is 函数
+ * @param val
+ * @param type
+ * @return {boolean}
+ */
 export function is (val, type) {
   return toString.call(val) === `[object ${type}]`;
 }
 
+/**
+ * 判断是否为 undefined
+ * @param val
+ * @return {boolean}
+ */
 export function isDef (val) {
   return typeof val !== 'undefined';
 }
 
+/**
+ * 判断值未定义
+ * @param val
+ * @return {boolean}
+ */
 export function isUnDef (val) {
   return !isDef(val);
 }
 
+/**
+ * 判断是否为 object
+ * @param val
+ * @return {boolean}
+ */
 export function isObject (val) {
   return val !== null && is(val, 'Object');
 }
 
-export function isEmpty (val) {
-  if (isArray(val) || isString(val)) {
-    return val.length === 0;
-  }
-
-  if (val instanceof Map || val instanceof Set) {
-    return val.size === 0;
-  }
-
-  if (isObject(val)) {
-    return Object.keys(val).length === 0;
-  }
-
-  return false;
-}
-
+/**
+ * 判断是否为 Date
+ * @param val
+ * @return {boolean}
+ */
 export function isDate (val) {
   return is(val, 'Date');
 }
 
+/**
+ * 判断是否为空值
+ * @param val
+ * @return {boolean}
+ */
 export function isNull (val) {
   return val === null;
 }
 
+/**
+ * 判断是否为空值且未定义
+ * @param val
+ * @return {boolean}
+ */
 export function isNullAndUnDef (val) {
   return isUnDef(val) && isNull(val);
 }
 
+/**
+ * 判断是否为空值或未定义
+ * @param val
+ * @return {boolean}
+ */
 export function isNullOrUnDef (val) {
   return isUnDef(val) || isNull(val);
 }
 
+/**
+ * 判断是否为数字
+ * @param val
+ * @return {boolean}
+ */
 export function isNumber (val) {
   return is(val, 'Number');
 }
 
+/**
+ * 判断是否为 Promise
+ * @param val
+ * @return {boolean}
+ */
 export function isPromise (val) {
   return is(val, 'Promise') && isObject(val) && isFunction(val.then) && isFunction(val.catch);
 }
 
+/**
+ * 判断是否为字符串
+ * @param val
+ * @return {boolean}
+ */
 export function isString (val) {
   return is(val, 'String');
 }
 
+/**
+ * 判断是否为函数
+ * @param val
+ * @return {boolean}
+ */
 export function isFunction (val) {
   return typeof val === 'function';
 }
 
+/**
+ * 判断是否为 Boolean
+ * @param val
+ * @return {boolean}
+ */
 export function isBoolean (val) {
   return is(val, 'Boolean');
 }
 
+/**
+ * 判断是否为正则
+ * @param val
+ * @return {boolean}
+ */
 export function isRegExp (val) {
   return is(val, 'RegExp');
 }
 
+/**
+ * 判断是否为数组
+ * @param val
+ * @return {boolean}
+ */
 export function isArray (val) {
   return val && Array.isArray(val);
 }
 
+/**
+ * 判断是否为 window
+ * @param val
+ * @return {boolean}
+ */
 export function isWindow (val) {
   return typeof window !== 'undefined' && is(val, 'Window');
 }
 
+/**
+ * 判断是否为 Element 元素
+ * @param val
+ * @return {boolean}
+ */
 export function isElement (val) {
   return isObject(val) && !!val.tagName;
 }
 
+/**
+ * 判断是否为 Map
+ * @param val
+ * @return {boolean}
+ */
 export function isMap (val) {
   return is(val, 'Map');
 }
 
+/**
+ * 服务端
+ * @type {boolean}
+ */
 export const isServer = typeof window === 'undefined';
 
+/**
+ * 客户端
+ * @type {boolean}
+ */
 export const isClient = !isServer;
diff --git a/src/core/isEmpty.js b/src/core/isEmpty.js
index f86173a..298c010 100644
--- a/src/core/isEmpty.js
+++ b/src/core/isEmpty.js
@@ -1,3 +1,5 @@
+import { isArray, isObject, isString } from './is';
+
 /**
  * 是否为空
  * 如果a值是空对象，集合，没有可枚举属性或任何不被视为集合的类型，则返回true。
@@ -25,7 +27,19 @@
  * // => true - type is not considered a collection
  */
 function isEmpty(val) {
-  return val == null || !(Object.keys(val) || val).length;
+  if (isArray(val) || isString(val)) {
+    return val.length === 0;
+  }
+
+  if (val instanceof Map || val instanceof Set) {
+    return val.size === 0;
+  }
+
+  if (isObject(val)) {
+    return Object.keys(val).length === 0;
+  }
+
+  return false;
 }
 
 export default isEmpty;