解析json并获取想要的值

[
{
"class":"1",
"id":"1",
"stu":
[
{
"name":"zhang",
"age":"11"
},
{
"name":"wang",
"age":"12"
}
]
},

    {
        "class":"2",
            "id":"2",
            "stu":
            [
              {
                   "name":"ding",
                     "age":"19"
                },
                {
                   "name":"li",
                     "age":"15"
                }
            ]
     }
    .
    ."class":"3"
    ."class":"4"
 ]
 例如这个json,  其中class 3,4,5等等就不写了.我想遍历出所有class的id和
 单独列出每个class里stu的信息.
 请问各位大大该怎么在js里实现啊.

http://blog.csdn.net/songylwq/article/details/6047609

 <!DOCTYPE html>
<html>
<head>
<script src="http://www.w3school.com.cn/jquery/jquery-1.11.1.min.js">
</script>
<script>
$(document).ready(function(){
  var t= [
{
"class":"1",
"id":"1",
"stu":
[
{
"name":"zhang",
"age":"11"
},
{
"name":"wang",
"age":"12"
}
]
},
    {
        "class":"2",
            "id":"2",
            "stu":
            [
              {
                   "name":"ding",
                     "age":"19"
                },
                {
                   "name":"li",
                     "age":"15"
                }
            ]
     }

 ]

for(var i=0;i<t.length;i++){ 
  alert( t[i].id+"--->"+t[i].class);    
  var stu=t[i].stu;
   for(var j=0;j<stu.length;j++){ 
   alert( stu[j].name+"--->"+stu[j].age);
   }
}

});
</script>
</head>
<body>


</body>
</html>

试试jQuery 的$.each();方法