JSON数据格式

JSON数据有以下形式

对象: 对象之内还能嵌套对象,名称只能用String来表示

    形式: {名称/值}  

    例子: {"数学成绩":95,"语文成绩":89}

数组:值的有序集合

    形式: [值],值之间用逗号分隔

    例子:[1,4,5]

值:可以是字符串,数值,布尔值,对象,数组

 

字符串:由双引号包围的任意数量Unicode字符的集合

     例子:"hello world"

将 JSON 数据赋值给变量：

var people =   { "programmers": [     { "firstName": "Brett", "lastName":"McLaughlin", "email": "[email protected]" },     { "firstName": "Jason", "lastName":"Hunter", "email": "[email protected]" },     { "firstName": "Elliotte", "lastName":"Harold", "email": "[email protected]" }   ],   "authors": [     { "firstName": "Isaac", "lastName": "Asimov", "genre": "science fiction" },     { "firstName": "Tad", "lastName": "Williams", "genre": "fantasy" },     { "firstName": "Frank", "lastName": "Peretti", "genre": "christian fiction" }   ],   "musicians": [     { "firstName": "Eric", "lastName": "Clapton", "instrument": "guitar" },     { "firstName": "Sergei", "lastName": "Rachmaninoff", "instrument": "piano" }   ]   }

访问数据的方式:

people.programmers[0].lastName;

修改数据的方式：

people.musicians[1].lastName = "Rachmaninov";

将JSON数据转换为字符串

String newJSONtext = people.toJSONString();

可以任何 JavaScript 对象转换为 JSON 文本

JSON的结构只有2种形式:对象,数组

JSON的值可以是: 数字,对象,数组,字符串,布尔值