每日一个js实例3-不同格式json解析

index1.json:

{

  "A":[

        {"name":"zhangsan"},

        {"sex":"man"},

        {"age":23}

      ],

  "B":[3,4,1,23,54]

 }

<script type="text/javascript">

    $.ajax({

        url:"../data/index1.json",

        type:"get",

        dataType:"json",

        success:function(data){

            //A

            alert(data);//[object object]对象集合

            alert(typeof data);//object

            alert(data.A);//[object object],[object object],[object object],

           alert(data.A[0]);//[object object]

             alert(typeof data.A);//object

            alert(data.A.name);//undefined

            alert(data.A.length);//3

           alert(data.A[0].name);//zhangsan

           alert(data.A[1].name);//undefined,之所以出现undefined,是因为json中[]内的每个{}也是一个对象数组了

            alert(data.A[1].sex);//man

            $('#json').html(data.A[0].name);//zhangsan

            for(var i in data.A){

                for(var j in data.A[i]){

                    document.write(i);//0,1.2

                    document.write(j);//name,sex,age

                   document.write(data.A[i]);//[object object],[object object],[object object]

                    document.write(data.A[j]);//undefine dundefine undefine

                   document.write(data.A[i][j]);//zhangsan,man,23

                   document.write(j+":"+data.A[i][j]+"<br/>");//打印data.A所有数据

                }

            }

            //B

            alert(data.B);//3,4,1,23,54

            alert(data.B[0]);//3

            alert(typeof data.B);//object

           for(var i=0;i<data.B.length;i++){

               document.write(i+":"+data.B[i]+"<br/>")

           }

           for(var i in data.B){

               document.write(i+":"+data.B[i]+"<br/>")

           }//以上两种循环方式结果一样，打印data.B所有数据

        }

    })

 </script>

index2.json:

{

  "ecgcode":[3,4,1,23,54],

  "ecg":

  {

    "id":1,

    "createDate":null,

    "updateDate":1476172420000,

    "uploadTime":1474445600000

    }

}

<script type="text/javascript">

    $.ajax({

        url:"../data/index2.json",

        type:"get",

        dataType:"json",

        success:function(data){

           document.write(data.ecg);//[object Object]

           document.write(data.ecg.id);//1

           for(var i in data.ecg){

               document.write(i+":"+data.ecg[i]+"<br/>");//打印data.ecg所有数据

           }

        }

    })

</script>

index3.json:

[

  {

    "_id": "58008a1b62ee553fefe76363",

    "index": 0,

    "tags": ["culpa","consequat","irure","aliqua","elit","amet","exercitation"],

    "friends": [

      {"id": 0,"name": "Lana Mathis"},

      {"id": 1,"name": "Molina Wade"},

      {"id": 2,"name": "Finley Potter"}

    ],

    "greeting": "Hello, Anita Kerr! You have 3 unread messages.",

    "favoriteFruit": "strawberry"

  },

  {

    "_id": "58008a1be00be2f90fda3738",

    "index": 1,

    "tags": ["ullamco","laboris","nulla","pariatur","non","excepteur","aliqua"],

    "friends": [

      {"id": 0,"name": "Malinda Bridges"},

      {"id": 1, "name": "Carrillo Le"},

      {"id": 2,"name": "Bates Ortega"}

    ],

  }

]

<script type="text/javascript">

    $.ajax({

        url:"../data/index3.json",

        type:"get",

        dataType:"json",

        success:function(data){

           alert(data);//[object Object]*5,有5个{}

            alert(data[0]);//[object Object]

            alert(data[0].index);//0

           alert(data[1].tags);//打印所有tags值

           alert(data[1].friends);//[object pbject],[object pbject],[object pbject]

            for(var i in data[1].friends){

               for(var j in data[1].friends[i]){

                   document.write(j+":"+data[1].friends[i][j]+"<br/>");//打印data[4].friends数据

               }

            }

            for(var i in data){

                for(var j in data[i]){

                    document.write(i);//0,1,2,3,4

                    document.write(j);//所有键值队的键

                    document.write(data[i]);//[object pbject],[object pbject],[object pbject]

                    document.write(data[j]);//undefine undefine undefine

                    document.write(data[i][j]);//zhangsan,man,23

                     document.write(j+":"+data[i][j]+"<br/>");//打印data所有数据

                }

            }

        }

    })

</script>