jquery遍历JSON数据

var json=[{"username":"张三","age":18,"address":"北京","list2":["list1","list2","list3"],"map":{"m1":"map1","m2":"map2","m3":"map3"}},{"username":"李四","age":22,"address":"河北","list2":["list21","list22","list23"],"map":{"m1":"map21","m2":"map22","m3":"map23"}}]

for(var i=0;i<returnData.length;i++){
     var address=returnData[i].address;
     var name=returnData[i].username;
     var age=returnData[i].age;
      $.each(json.map,function(key,value){

               //其中key相当于是JAVA中MAP中的KEY，VALUE就是KEY相对应的值

               alert(key+"    "+value);
        })

     $.each(json.list2,function(index,value){

             //其中index相当于JAVA中的LIST中的索引，VALUE为索引对应的值，其中索引从0开始

            alert(index+"   "+value);
      })
    }