json 总结

json 是存储和交换文本信息的语法

1 JSON 指的是 JavaScript 对象表示法（JavaScript Object Notation）

2 语法： 名称/值 "firstname":"sb"

3 对象：可以包含多个名称/值对,用花括号 { "firstName":"John" , "lastName":"Doe" }

4 数组：在方括号中可以包含多个对象

{

"employees": [

{ "firstName":"John" , "lastName":"Doe" },

{ "firstName":"Anna" , "lastName":"Smith" },

{ "firstName":"Peter" , "lastName":"Jones" }

]

}

5 json 使用js 语法

法一：

var employees = [

{ "firstName":"Bill" , "lastName":"Gates" },

{ "firstName":"George" , "lastName":"Bush" },

{ "firstName":"Thomas" , "lastName": "Carter" }

];

employees[0].lastName;

法二：

var txt = '{ "employees" : [' +

'{ "firstName":"Bill" , "lastName":"Gates" },' +

'{ "firstName":"George" , "lastName":"Bush" },' +

'{ "firstName":"Thomas" , "lastName":"Carter" } ]}';

txt.employees[0].lastName