curl --location --request GET 'https://hmajax.itheima.net/api-s/categorySecond?firstId=621'
{
"msg": "恭喜你, 操作成功",
"code": 200,
"list": [
{
"id": 1,
"secondId": "622",
"secondName": "咖啡",
"firstId": "621"
}
]
}