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