JSON語法介紹
阿新 • • 發佈:2018-11-22
官網:https://www.json.org/
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language.
譯:
JSON(JavaScript Object Notation)是一種輕量級的資料交換格式。 人類很容易讀寫。 機器很容易解析和生成。 它基於JavaScript程式語言的一個子集,標準ECMA-262第3版 - 1999年12月.JSON是一種完全獨立於語言的文字格式,但使用C語言系列程式設計師熟悉的約定,包括C語言 ,C ++,C#,Java,JavaScript,Perl,Python等等。 這些屬性使JSON成為理想的資料交換語言。
JSON is built on two structures:
* A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
* An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.
譯:
JSON基於兩種結構:
名稱/值對的集合。 在各種語言中,這被實現為物件,記錄,結構,字典,散列表,鍵控列表或關聯陣列。
有序的值列表。 在大多數語言中,這被實現為陣列,向量,列表或序列。
These are universal data structures. Virtually all modern programming languages support them in one form or another. It makes sense that a data format that is interchangeable with programming languages also be based on these structures.
譯:
這些是通用資料結構。 實際上,所有現代程式語言都以某種形式支援它們。 有意義的是,可與程式語言互換的資料格式也基於這些結構。
In JSON, they take on these forms:
1.
An object is an unordered set of name/value pairs. An object begins with { (left brace) and ends with } (right brace). Each name is followed by : (colon) and the name/value pairs are separated by , (comma).
譯:
在JSON中,他們採用以下形式:
物件是一組無序的名稱/值對。 物件以{(左括號)開頭,以}結尾(右括號)。 每個名稱後跟:(冒號),名稱/值對用(逗號)分隔。
總結:用花括號表示物件,名稱/值對可以有多個,並用逗號分隔
示例:
{ "firstName":"John" , "lastName":"Doe" }
一個{}就是一個JSONObject
2.
An array is an ordered collection of values. An array begins with [ (left bracket) and ends with ] (right bracket). Values are separated by , (comma).
譯:
陣列是有序的值集合。 陣列以[(左括號)開頭並以]結尾(右括號)。 值以(逗號)分隔。
總結:用方括號表示陣列,值以逗號分隔
示例:
陣列可包含多個物件
{
"employees": [
{ "firstName":"John" , "lastName":"Doe" },
{ "firstName":"Anna" , "lastName":"Smith" },
{ "firstName":"Peter" , "lastName":"Jones" }
]
}
說明:employees的值是一個數組,陣列的元素是3個物件,每個物件是名稱/值對,3個物件之間以逗號分隔
3.
A value can be a string in double quotes, or a number, or true or false or null, or an object or an array. These structures can be nested.
譯:
值可以是雙引號中的字串,數字,或true或false或null,或物件或陣列。 這些結構可以巢狀。
JSON 值可以是:
- 數字(整數或浮點數)
- 字串(在雙引號中)
- 邏輯值(true 或 false)
- 陣列(在方括號中)
- 物件(在花括號中)
- null
- JSONObject
- JSONArray