# \_.isEmpty（是否为空）

**语法：**

```javascript
_.isEmpty(value)
```

**源代码链接：**[source](https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L11478)

**npm包链接：**[npm package](https://www.npmjs.com/package/lodash.isempty)

**描述：**

检查`value`是否为一个空对象，集合，映射或者set。 判断的依据是除非是有枚举属性的对象，length 大于 0 的 arguments object, array, string 或类jquery选择器。

对象（Objects）如果被认为为空，那么他们没有自己的可枚举属性的对象。

类数组（Array-like）值，比如`arguments`对象，array，buffer，string或者类jQuery集合的`length`为`0`，被认为是空。类似的，map（映射）和set 的`size`为`0`，被认为是空。

**开始版本：**0.1.0

**参数：**

* `value (*)`: 要检查的值。

**返回值：**

* `(boolean)`: 如果 value 为空，那么返回 true，否则返回 false。

**例子：**

```javascript
_.isEmpty(null);
// => true

_.isEmpty(true);
// => true

_.isEmpty(1);
// => true

_.isEmpty([1, 2, 3]);
// => false

_.isEmpty({ 'a': 1 });
// => false
```


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