ExtJs 获取List 嵌套List数据显示在FormPanel中

{
    "__params": null,
    "jsonStr": "数据检索成功",
    "limit": 20,
    "start": 0,
    "success": true,
    "totalCount": 0,
    "voteOption": null,
    "voteSubject": null,
    "voteSubjectList": [
        {
            "actionErrors": [],
            "actionMessages": [],
            "errorMessages": [],
            "errors": {},
            "fieldErrors": {},
            "locale": "zh_CN",
            "texts": null,
            "voteOptions": [
                {
                    "actionErrors": [],
                    "actionMessages": [],
                    "errorMessages": [],
                    "errors": {},
                    "fieldErrors": {},
                    "locale": "zh_CN",
                    "texts": null,
                    "voId": 4,
                    "voOption": "很好",
                    "voteSubject": null
                },
                {
                    "actionErrors": [],
                    "actionMessages": [],
                    "errorMessages": [],
                    "errors": {},
                    "fieldErrors": {},
                    "locale": "zh_CN",
                    "texts": null,
                    "voId": 1,
                    "voOption": "很好",
                    "voteSubject": null
                },
                {
                    "actionErrors": [],
                    "actionMessages": [],
                    "errorMessages": [],
                    "errors": {},
                    "fieldErrors": {},
                    "locale": "zh_CN",
                    "texts": null,
                    "voId": 2,
                    "voOption": "很好",
                    "voteSubject": null
                },
                {
                    "actionErrors": [],
                    "actionMessages": [],
                    "errorMessages": [],
                    "errors": {},
                    "fieldErrors": {},
                    "locale": "zh_CN",
                    "texts": null,
                    "voId": 3,
                    "voOption": "很好",
                    "voteSubject": null
                }
            ],
            "vsId": 118,
            "vsTitle": "你觉得很好吗?",
            "vsType": 1
        }
    ],
    "vsTitle": null,
    "vsType": null
}

Extjs 如何获取voteOptions里面的数据 外层的获取到了.请大牛赐教.