JOSN

JSON：是一种轻量级的数据交换格式；
{key:value  ,  key:value};
var student ={lastname:"张三", age:18};
 
value:可以有很多种
1 基本的数据类型（字符串 ，数字 ，布尔值）
2 数组 
{lastname:"李四"，  books:["西游记","红楼梦","三国演义","水浒传",{},18]   }；
3 对象
 
var student ={lastname:"张三"，age:18,car:{pp:"雷克萨斯",price:"30000$"}};
 
<%@ page language="java" contentType="text/html; charset=UTF-8"
       pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
</body>
<script type="text/javascript">
       //一个复杂的json对象
       var student = {
              username : "zhagnshang",
              age : 18,
              car : {
                     color : "red",
                     weight : "1.1吨",
                     price : "300000￥"
              },
              infos : [ {
                     bookname : "",
                     price : 99.88
              }, 18, true ]
       };
       //js 对象的好处，属性操作特别方便
       alert(student.username);//usernaem
       alert("weishenmebuxing");
       //json的要求和js对象是一样的，只不过key必须是字符串
       //js对象在声明key的时候是否加双引号可以选择
       var student2 = {
              username : "zhagnshang",
              age : 18
       }
       alert(student2);
       var strjson=JSON.stringify(student2);
</script>
</html>
 
 
 
 
 
posted @ 2020-11-10 17:18  泽桑  阅读(595)  评论(0)    收藏  举报