JSON对象

JSON 对象数据类型是用大括号括起来的名称/值对的列表.

1. JSON 对象非常类似于 javascript 对象.
2. JSON 对象以键/值对形式编写.
3. JSON 对象由大括号{ }括起来 .
4. 键必须是字符串，值必须是有效的 JSON 数据类型（字符串、数字、对象、数组、布尔值或 null）.
5. 键和值由冒号分隔.
6. 每个键/值对都用逗号分隔.

JSON 对象示例是:

{
	"name" : "Admin",
	"age" : 36,
	"rights" : [ "admin", "editor", "contributor" ]
}

1. 访问对象值

您可以通过两种方式访问​​对象值 :

1.1. 使用点 (.) 表示法

var author = {
	"name" : "Admin",
	"age" : 36,
	"rights" : [ "admin", "editor", "contributor" ]
}

console.log( author.name );

//Output

Admin

1.2. 使用方括号 ([]) 表示法

var author = {
	"name" : "Admin",
	"age" : 36,
	"rights" : [ "admin", "editor", "contributor" ]
}

console.log( author [ "name" ] );
console.log( author [ "age" ] );

//Output

Admin
36

2. 循环对象值

您可以使用 for 循环遍历对象值，就像循环遍历数组一样.

var author = {
	"name" : "Admin",
	"age" : 36,
	"rights" : [ "admin", "editor", "contributor" ]
}

//Looping

for (x in author)
{
	console.log(x + " - " + (author[x]));
}

//Output

name - Admin
age - 36
rights - admin,editor,contributor

3. 修改对象值

要修改对象值，请使用给定的两种方法之一:

3.1. 使用点 (.) 表示法

var author = {
	"name" : "Admin",
	"age" : 36,
	"rights" : [ "admin", "editor", "contributor" ]
}

author.name = "Lokesh";

console.log( author.name );

//Output

Lokesh

3.2. 使用方括号 ([]) 表示法

var author = {
	"name" : "Admin",
	"age" : 36,
	"rights" : [ "admin", "editor", "contributor" ]
}

author["name"] = "Lokesh";
author["age"] = 35;

console.log( author [ "name" ] );
console.log( author [ "age" ] );

//Output

Lokesh
35

4. 删除对象值

使用delete关键字从 JSON 对象中删除属性:

delete author.name;