遍历对象所有属性（json对象）

var response = {
    "status": 1,
    "message": "\u6210\u529f",
    "data": {
        "nowpage": 1,
        "totle_page": 1,
        "data": [
            {
                "user_id": "11",
                "user_createdate": "2015-03-10 12:54",
                "user_phone": "18614088211",
                "user_status": "2",
                "last_logindate": "2015-03-10 12:55",
                "grade": "\u672a\u6388\u6743",
                "real_name": "",
                "remark": "\u6ca1\u94b1\u4e86",
                "user_status_name": "\u51bb\u7ed3"
            },
       {
                "user_id": "11",
                "user_createdate": "2015-03-10 12:54",
                "user_phone": "18614088211",
                "user_status": "2",
                "last_logindate": "2015-03-10 12:55",
                "grade": "\u672a\u6388\u6743",
                "real_name": "",
                "remark": "\u6ca1\u94b1\u4e86",
                "user_status_name": "\u51bb\u7ed3"
            }
        ]
    }
}
for( a in response.data.data){
    for( b in response.data.data[a]){
        console.log(b + ' : ' + response.data.data[a][b])
    }
}

for( a in b )方法利用数组的形式可以在不知全部字段的情况下输出所有内容

b不同时，a的含义也不同。b是数组，a就是序号，b是对象，a就是键值，这里的a不管是序号还是键值，我们都可以灵活使用，判断、循环、输出，视情况而定