A simple example of JSON + JavaScript processing

Source: Internet
Author: User

JSON (JavaScript Object Notation) is a lightweight data exchange format. Easy to read and write. It is also easy to parse and generate machines. It is based on a subset of JavaScript Programming Language, Standard ECMA-262 3rd Edition-December 1999. JSON uses a completely language-independent text format, but it also uses a habit similar to the C language family (including C, C ++, C #, Java, JavaScript, Perl, Python, and so on ). These features make JSON an ideal data exchange language.

JSON is constructed in two structures:

1. A collection of name/value pairs ). In different languages, it is understood as an object, record, struct, dictionary, and hash table ), keyed list or associative array ).

2. An ordered list of values ). In most languages, it is understood as an array ).

These are common data structures. In fact, most modern computer languages support them in some form. This makes it possible to exchange a data format between programming languages that are also based on these structures.

JSON has the following forms:

• An object is an unordered set of 'name/value' pairs. An object starts with "{" (left parenthesis) and ends with "}" (right Parenthesis. Each "name" is followed by a ":" (colon); "," (comma) is used to separate the "name/value" pairs.
• An array is an ordered set of values. An array starts with "[" (left square brackets) and ends with "]" (right square brackets. Values are separated by commas.
• Values can be string, number, true, false, null, object, or array enclosed by double quotation marks ). These structures can be nested.
• String is a collection of any number of Unicode characters enclosed by double quotation marks, which are escaped using a backslash. A character (character) is a separate string (character string ).
• Strings are very similar to strings in C or Java.
• Number is also very similar to the value in C or Java. Remove unused octal and hexadecimal formats. Except for some encoding details.
• Blank spaces can be added to any symbol. The complete language is described below.
JSON example (json is used in javascript ):

Copy codeThe Code is as follows: <script type = "text/javascript">
Var user =
{
"Id": 1,
"Name": "Hubery ",
"Age": 23,
"Address ":
{
"City": "Beijing", "ZipCode": "111111"
},
"Email": "hubery@jb51.net"
};

Alert (user. Id );
Alert (user. Name );
Alert (user. Age );
Alert (user. Address. City );
Alert (user. Address. ZipCode );
Alert (user. Email );
</Script>
The Address attribute is defined as an array. The user has two addresses:

<Script type = "text/javascript">
Var user =
{
"Id": 1,
"Name": "Hubery ",
"Age": 23,
"Address ":
[
{"City": "Beijing", "ZipCode": "111111 "},
{"City": "Langfang", "ZipCode": "222222 "}
],
"Email": "hubery@jb51.net"
};

Alert (user. Id );
Alert (user. Name );
Alert (user. Age );
Alert (user. Address [0]. City); // You can also: alert (user. Address [0] ["City"]);
Alert (user. Address [0]. ZipCode );
Alert (user. Address [1]. City );
Alert (user. Address [1]. ZipCode );
Alert (user. Email );
</Script>

If we want a user list, can we? The answer is, no problem!

Copy codeThe Code is as follows: <script type = "text/javascript">
Var user =
[
{
"Id": 1,
"Name": "Hubery ",
"Age": 23,
"Address ":
[
{"City": "Beijing", "ZipCode": "111111 "},
{"City": "Langfang", "ZipCode": "222222 "}
],
"Email": "hubery@jb51.net"
},
{
"Id": 2,
"Name": "Chris ",
"Age": 24,
"Address": {"City": "Beijing", "ZipCode": "100085 "},
"Email": "chris@jb51.net"
}
]

Alert ("Id:" + user [0]. Id + "\ r \ nName:" +
User [0]. Name + "\ r \ nAge:" +
User [0]. Age + "\ r \ nAddress: (" +
User [0]. address [0]. city + "," + user [0]. address [0]. zipCode + ") (" + user [0]. address [1]. city + "," + user [0]. address [1]. zipCode + ") \ r \ nEmail:" +
User [0]. Email );

Alert ("Id:" + user [1]. Id + "\ r \ nName:" +
User [1]. Name + "\ r \ nAge:" +
User [1]. Age + "\ r \ nAddress: (" +
User [1]. Address. City + "," + user [1]. Address. ZipCode + ") \ r \ nEmail:" +
User [1]. Email );
</Script>

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