json字符串，提取内容

下面是我的字符串

jsonStr ="[{\"大家电\":[{\"one\":\"电视机\"},{\"two\":\"电冰箱\"},{\"three\":\"空调\"},{\"four\":\"洗衣机\"}]}]";

在前端用json方式把内容提取出来

你的json串最外面多了两个大括号吧，在前端提取的话是想用js还是嵌套java代码，js的话用eval()或者JSON.parse()

你这json 格式有问题啊！

JSON.parse(str);
循环取值

     var jsonStr = "[{\"大家电\":[{\"one\":\"电视机\"},{\"two\":\"电冰箱\"},{\"three\":\"空调\"},{\"four\":\"洗衣机\"}]}]";
    var json = eval('(' + jsonStr + ')');
    for (var i = 0; i < json[0].大家电.length; i++) {
        for (attr in json[0].大家电[i]) alert(json[0].大家电[i][attr])
    }

    /* 获取天气 */
                        function getWeather(){
                              var ipUrl = "${base}/weather/getWeatherByaddr.jhtml";
                              $.ajax({
                                url: ipUrl,
                                async: true,
                                type: "get",
                                dataType: "json",
                                success: function(data) {
                                   var weather = data.retData.today.type;
                                   var temperature = data.retData.today.curTemp;
                                }
                            });
                        }

                        $(function(){   
                            getWeather();
                        });
                    /* 获取天气结束 */

用ajax逐层提取，这是我之前取一个json串获取天气的ajax，json如下：

JSON返回示例 :
{
errNum: 0,
errMsg: "success",
retData: {
city: "北京",
cityid: "101010100",
today: {
date: "2015-08-03",
week: "星期一",
curTemp: "28℃",
aqi: "92",
fengxiang: "无持续风向",
fengli: "微风级",
hightemp: "30℃",
lowtemp: "23℃",
type: "阵雨",
index: [
{
name: "感冒指数",
code: "gm",
index: "",
details: "各项气象条件适宜，发生感冒机率较低。但请避免长期处于空调房间中，以防感冒。",
otherName: ""
},
{
code: "fs",
details: "属中等强度紫外辐射天气，外出时应注意防护，建议涂擦SPF指数高于15，PA+的防晒护肤品。",
index: "中等",
name: "防晒指数",
otherName: ""
},
{
code: "ct",
details: "天气炎热，建议着短衫、短裙、短裤、薄型T恤衫等清凉夏季服装。",
index: "炎热",
name: "穿衣指数",
otherName: ""
},
{
code: "yd",
details: "有降水，推荐您在室内进行低强度运动；若坚持户外运动，须注意选择避雨防滑并携带雨具。",
index: "较不宜",
name: "运动指数",
otherName: ""
},
{
code: "xc",
details: "不宜洗车，未来24小时内有雨，如果在此期间洗车，雨水和路上的泥水可能会再次弄脏您的爱车。",
index: "不宜",
name: "洗车指数",
otherName: ""
},
{
code: "ls",
details: "有降水，不适宜晾晒。若需要晾晒，请在室内准备出充足的空间。",
index: "不宜",
name: "晾晒指数",
otherName: ""
}
]
},
forecast: [
{
date: "2015-08-04",
week: "星期二",
fengxiang: "无持续风向",
fengli: "微风级",
hightemp: "32℃",
lowtemp: "23℃",
type: "多云"
},
{
date: "2015-08-05",
week: "星期三",
fengxiang: "无持续风向",
fengli: "微风级",
hightemp: "30℃",
lowtemp: "23℃",
type: "多云"
},
{
date: "2015-08-06",
week: "星期四",
fengxiang: "无持续风向",
fengli: "微风级",
hightemp: "29℃",
lowtemp: "24℃",
type: "雷阵雨"
},
{
date: "2015-08-07",
week: "星期五",
fengxiang: "无持续风向",
fengli: "微风级",
hightemp: "30℃",
lowtemp: "24℃",
type: "多云"
}
],
history: [

        {
            date: "2015-07-31",
            week: "星期五",
            aqi: "52",
            fengxiang: "无持续风向",
            fengli: "微风级",
            hightemp: "高温 29℃",
            lowtemp: "低温 22℃",
            type: "多云"
        },
        {
            date: "2015-08-01",
            week: "星期六",
            aqi: null,
            fengxiang: "南风",
            fengli: "微风级",
            hightemp: "高温 35℃",
            lowtemp: "低温 26℃",
            type: "多云"
        }
    ]
}

}

你可以根据这个把你的json解析出来