获取分类

{
    "code": 200,
    "errMsg": null,
    "data": {
        "page": 1,
        "size": 2,
        "data": [
            {
                "categoryId": 31,
                "displayName": "指越使花了",
                "slug": "aliquip ad dolor minim",
                "cover": null,
                "unifiedCover": false,
                "postCount": 1
            },
            {
                "categoryId": 29,
                "displayName": "KotlinA",
                "slug": "kotlin",
                "cover": "/1.png",
                "unifiedCover": true,
                "postCount": 2
            }
        ],
        "totalData": 26,
        "totalPages": 13
    }
}