键名不固定的JSON数据该怎么取值

{
    "1": {
        "fid": "1",
        "fup": "0",
        "type": "group",
        "name": "%E4%BA%92%E5%8A%A8%E9%BE%99%E5%9F%8E",
        "threads": "0",
        "posts": "0",
        "todayposts": "0",
        "lastpost": "",
        "inheritedmod": "0",
        "domain": "",
        "forumcolumns": "0",
        "simple": "0",
        "description": "",
        "moderators": "",
        "icon": "",
        "viewperm": "",
        "redirect": "",
        "extra": [],
        "forumscount": 4,
        "forums": [
            "2",
            "36",
            "37",
            "38"
        ],
        "collapseimg": "collapsed_no.gif"
    },
    "39": {
        "fid": "39",
        "fup": "0",
        "type": "group",
        "name": "%E7%94%9F%E6%B4%BB%E5%A8%B1%E4%B9%90",
        "threads": "0",
        "posts": "0",
        "todayposts": "0",
        "lastpost": "",
        "inheritedmod": "0",
        "domain": "",
        "forumcolumns": "0",
        "simple": "0",
        "description": "",
        "moderators": "",
        "icon": "",
        "viewperm": "",
        "redirect": "",
        "extra": [],
        "forumscount": 2,
        "forums": [
            "40",
            "41"
        ],
        "collapseimg": "collapsed_no.gif"
    }
}健“1”和“39”都不是固定的，我怎么取键“1”下的name值？