本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

# \$1in
<a name="in-aggregation"></a>

`$in`聚合运算符检查数组中是否存在指定值。`true`如果在数组中找到该值，则返回，`false`否则返回。

**参数**
+ `value`：要搜索的值。
+ `array`: 要在其中搜索的数组。

## 示例（MongoDB 外壳）
<a name="in-aggregation-examples"></a>

以下示例演示如何使用`$in`操作员来检查每位员工的技能组合中是否存在特定技能。

**创建示例文档**

```
db.employees.insertMany([
  { _id: 1, name: "Sarah", skills: ["Python", "JavaScript", "SQL"] },
  { _id: 2, name: "Mike", skills: ["Java", "C++", "Go"] },
  { _id: 3, name: "Emma", skills: ["Python", "Ruby", "Rust"] }
]);
```

**查询示例**

```
db.employees.aggregate([
  {
    $project: {
      name: 1,
      hasPython: { $in: ["Python", "$skills"] }
    }
  }
]);
```

**输出**

```
[
  { _id: 1, name: 'Sarah', hasPython: true },
  { _id: 2, name: 'Mike', hasPython: false },
  { _id: 3, name: 'Emma', hasPython: true }
]
```

## 代码示例
<a name="in-aggregation-code"></a>

要查看使用`$in`聚合运算符的代码示例，请选择要使用的语言的选项卡：

------
#### [ Node.js ]

```
const { MongoClient } = require('mongodb');

async function example() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const collection = db.collection('employees');

  const result = await collection.aggregate([
    {
      $project: {
        name: 1,
        hasPython: { $in: ["Python", "$skills"] }
      }
    }
  ]).toArray();

  console.log(result);
  await client.close();
}

example();
```

------
#### [ Python ]

```
from pymongo import MongoClient

def example():
    client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
    db = client['test']
    collection = db['employees']

    result = list(collection.aggregate([
        {
            '$project': {
                'name': 1,
                'hasPython': { '$in': ['Python', '$skills'] }
            }
        }
    ]))

    print(result)
    client.close()

example()
```

------