> For the complete documentation index, see [llms.txt](https://lodash.shujuwajue.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lodash.shujuwajue.com/collection/size.md).

# \_.size（返回数组或对象的长度）

**语法：**

```javascript
_.size(collection)
```

**源代码链接：**[source](https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L9842)

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

**描述：**

返回`collection`（集合）的长度，如果集合是类数组或字符串，返回其 length ；如果集合是对象，返回其可枚举属性的个数。

**开始版本：**0.1.0

**参数：**

* `collection (Array|Object)`: 要检查的集合

**返回值：**

* `(number)`: 返回集合的长度。

**例子：**

```javascript
_.size([1, 2, 3]);
// => 3

_.size({ 'a': 1, 'b': 2 });
// => 2

_.size('pebbles');
// => 7
```