在Apollo/GraphQL中，要通过mutation来修改数组。可以按如下步骤操作：

1. 定义GraphQL mutation：

mutation AddItem($item: ItemInput!) {
  addItem(item: $item) {
    id
    name
    description
  }
}

2. 在组件当中使用mutation：

import { useMutation } from '@apollo/react-hooks';
import { ADD_ITEM } from '../graphql/mutations';

function AddItemForm() {
  const [item, setItem] = useState({});

  const [addItem, { loading, error }] = useMutation(ADD_ITEM, {
    onCompleted(data) {
      // Do something with data
    },
    onError(error) {
      // Handle error
    }
  });

  const handleSubmit = (e) => {
    e.preventDefault();

    addItem({ variables: { item } });
  };

  return (
    

       setItem({ ...item, name: e.target.value })} />
       setItem({ ...item, description: e.target.value })} />

      Add Item

      {error && 
{error.message}
}
    
  )
}

3. 在后端实现mutation：

const typeDefs = gql`
  input ItemInput {
    name: String
    description: String
  }

  type Item {
    id: Int
    name: String
    description: String
  }

  type Mutation {
    addItem(item: ItemInput): Item
  }
`;

const resolvers = {
  Mutation: {
    addItem: (_, { item }) => {
      const newItem = {
        id: items.length + 1,
        ...item
      };

      items.push(newItem);

      return newItem;
    }
  }
}