下面是一个使用AG-Grid的基于子集的列分组的代码示例：

1. 首先，创建一个包含列定义的变量：

var columnDefs = [
    { headerName: "Athlete", field: "athlete", width: 150 },
    { headerName: "Country", field: "country", width: 150 },
    { headerName: "Sport", field: "sport", width: 150 },
    { headerName: "Year", field: "year", width: 100 },
    { headerName: "Gold", field: "gold", width: 100 },
    { headerName: "Silver", field: "silver", width: 100 },
    { headerName: "Bronze", field: "bronze", width: 100 }
];

2. 创建一个包含数据的变量：

var rowData = [
    { athlete: "Michael Phelps", country: "United States", sport: "Swimming", year: "2008", gold: 8, silver: 0, bronze: 0 },
    { athlete: "Michael Phelps", country: "United States", sport: "Swimming", year: "2012", gold: 4, silver: 2, bronze: 0 },
    { athlete: "Usain Bolt", country: "Jamaica", sport: "Athletics", year: "2008", gold: 3, silver: 0, bronze: 1 },
    { athlete: "Usain Bolt", country: "Jamaica", sport: "Athletics", year: "2012", gold: 3, silver: 0, bronze: 0 },
    { athlete: "Simone Biles", country: "United States", sport: "Gymnastics", year: "2016", gold: 4, silver: 1, bronze: 0 },
    { athlete: "Simone Biles", country: "United States", sport: "Gymnastics", year: "2020", gold: 2, silver: 0, bronze: 3 }
];

3. 创建一个AG-Grid实例，并设置groupUseEntireRow为true以启用基于子集的列分组：

var gridOptions = {
    columnDefs: columnDefs,
    rowData: rowData,
    groupUseEntireRow: true
};

// 将gridOptions与DOM元素进行绑定
var gridDiv = document.querySelector('#myGrid');
new agGrid.Grid(gridDiv, gridOptions);

4. 运行代码，你将看到AG-Grid中的列使用子集进行分组。

以上就是使用AG-Grid实现基于子集的列分组的代码示例。你可以根据自己的需求进行修改和扩展。请确保已经引入AG-Grid的相关文件。