JSON入门

来源：互联网发布：淘宝期货是什么意思啊编辑：程序博客网时间：2024/05/17 14:15

下午看了下json,感觉json基本格式就是键/值的字符串列表.

基本格式:

var user = {UserName:"json",Age:25};

以"{"开始,以"}"结束,中间的内容就是键/值对应的形式,每个项之间用 ',' 逗号各开.

其中每个项的值还可以嵌套的

var user = {UserName:{FirstName:"xiage",LastName:"zhao"},Age:25};

访问的时候可以:

user.UserName.FirstName;

user.UserName["FirstName"];

如果是数组就可以写成这样:

var userList =

[

{

UserName:"burt",Age:24

{

UserName:"Ackley",Age:38

{

UserName:"Lockey",Age:23

}

]

以"["开始,"]"结束. 中间就是一个个项.

下面是一个小例子:

<html>
<head>
<script>
var userList =
[
{
UserId:1,
UserName:{FirstName:"xiage" ,LastName:"zhao" },
Email:"xiagezhao@gmail.com"
},

{
UserId:2,
UserName:{FirstName:"jhon",LastName:"white"},
Email:"4guiguiguigui@163.com"
},

{
UserId:3,
UserName:{FirstName:"ackley",LastName:"Bluse"},
Email:""
}

];

function json_test(){
alert(userList[2].UserName.LastName);
}
</script>
</head>
<body>
<input type='button' value='JSON格式' onclick='json_test()' />
</body>
</html>