JQuery解析json数据

 1 <script>
 2     var data ="{" +
 3             "root:[" +
 4             "{name:\'1\',value:\'0\'}," +
 5             "{name:\'6101\',value:\'北京市\'}," +
 6             "{name:\'6102\',value:\'天津市\'}," +
 7             "{name:\'6103\',value:\'上海市\'}," +
 8             "{name:\'6104\',value:\'重庆市\'}," +
 9             "{name:\'6105\',value:\'渭南市\'}," +
10             "{name:\'6106\',value:\'延安市\'}," +
11             "{name:\'6107\',value:\'汉中市\'}," +
12             "{name:\'6108\',value:\'榆林市\'}," +
13             "{name:\'6109\',value:\'安康市\'}," +
14             "{name:\'6110\',value:\'商洛市\'}" +
15             "]}";
16 
17      var dataObj = eval("("+data+")");//转换为json对象
18      alert(dataObj.root.length);//输出root的子对象数量
19 
20      $.each(dataObj.root,function(idx,item){
21          if(idx==0){
22             return true;
23          }
24          //输出每个root子对象的名称和值
25          console.log("name:"+item.name+",value:"+item.value);
26      });
27 </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。