JQuery解析json数据

<script>
    var data ="{" +
            "root:[" +
            "{name:'1',value:'0'}," +
            "{name:'6101',value:'北京市'}," +
            "{name:'6102',value:'天津市'}," +
            "{name:'6103',value:'上海市'}," +
            "{name:'6104',value:'重庆市'}," +
            "{name:'6105',value:'渭南市'}," +
            "{name:'6106',value:'延安市'}," +
            "{name:'6107',value:'汉中市'}," +
            "{name:'6108',value:'榆林市'}," +
            "{name:'6109',value:'安康市'}," +
            "{name:'6110',value:'商洛市'}" +
            "]}";

     var dataObj = eval("("+data+")");//转换为json对象
     alert(dataObj.root.length);//输出root的子对象数量

     $.each(dataObj.root,function(idx,item){
         if(idx==0){
            return true;
         }
         //输出每个root子对象的名称和值
         console.log("name:"+item.name+",value:"+item.value);
     });
</script>

　　定义一个json格式的字符串data.

　　对于服务器返回的JSON字符串，如果jquery异步请求没做类型说明，或者以字符串方式接受，

那么需要做一次对象化处理，方式不是太麻烦，就是将该字符串放于eval()中执行一次。这种方式也适合以普通javascipt方式获取json对象.

　　转成对象后，然后遍历取值就OK。