> 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/seq/chain.md).

# \_.chain

**语法：**

```javascript
_.chain(value)
```

**源代码链接：**[source](https://github.com/lodash/lodash/blob/4.17.10/lodash.js#L8737)

**描述：**

创建一个`lodash`包装实例，包装`value`以启用显式链模式。要解除链必须使用`_#value`方法。

**开始版本：**1.3.0

**参数：**

* `value (*)`: 要包装的值。

**返回值：**

* `(Object)`: 返回 lodash 包装的实例。

**例子：**

```javascript
var users = [
  { 'user': 'barney',  'age': 36 },
  { 'user': 'fred',    'age': 40 },
  { 'user': 'pebbles', 'age': 1 }
];

var youngest = _
  .chain(users)
  .sortBy('age')
  .map(function(o) {
    return o.user + ' is ' + o.age;
  })
  .head()
  .value();
// => 'pebbles is 1'
```