JavaScript Json (GO)

JSON is the abbreviation for JavaScript Object notation, which is a data interchange format.

Finally, on a day in 2002, Grass Crockford Douglas Crockford, a software engineer who had been fooled by a handful of giant software companies in order to save a deep abyss, invented the ultra-lightweight data Interchange format of JSON.

As a senior architect of Yahoo, Douglas has a natural fondness for JavaScript. The JSON he designed is actually a subset of JavaScript. In JSON, there are a total of several data types:

• Number: Exactly the same as JavaScript number ;
• Boolean: is JavaScript true or false ;
• String: It's JavaScript string ;
• Null: it is JavaScript null ;
• Array: That's the Array way JavaScript is represented-- [] ;
• Object: The way JavaScript is { ... } represented

I've finally specified the origin of JSON.

Serialization of

var xiaoming = {    name: ' Xiaoming ',    age:14,    gender:true,    height:1.65,    grade:null,    ' Middle-school ' : ' \ ' w3c\ ' Middle School ',    skills: [' JavaScript ', ' Java ', ' Python ', ' Lisp ']}; Json.stringify (xiaoming); ' {' name ': ' Xiaoming ', ' age ': +, ' gender ': true, ' height ': 1.65, ' grade ': null, ' middle-school ': ' \ ' w3c\ ' Middle school ', ' Skills ": [" JavaScript "," Java "," Python "," Lisp "]} '

　　

We can also add some parameters to make it easier to view

Json.stringify (xiaoming, NULL, '  ); output {  "name": "Xiaoming", "Age  ": +,  "gender": true,  "height": 1.65,  "grade": null,  "Middle-school": "\" w3c\ "Middle School",  "skills": [    "JavaScript",    " Java ",    " Python ",    " Lisp "  ]}

　　

The second parameter is used to control how the object's key value is filtered, and if we only want to output the specified property, we can pass in Array:JSON.stringify (xiaoming, [' Name ', ' skills '], "  ); Result: {  " name ": "Xiaoming",  "skills": [    "JavaScript",    "Java",    "Python",    "Lisp"  ]}

　　

You can also pass in a function so that each key-value pair of an object will be processed first: function convert (key, value) {    if (typeof value = = = ' String ') {        return Value.touppercase ();    }    return value;} Json.stringify (xiaoming, convert, "  ); The above code capitalizes all attribute values: {  " name ":" Xiaoming "," Age ":"  Gender ": True,  "height": 1.65,  "grade": null,  "Middle-school": "\" w3c\ "Middle School",  "skills": [    "JAVASCRIPT",    "JAVA",    "PYTHON",    "LISP"  ]}

If we also want to control exactly how to serialize xiaoming, you can define a Tojson () method for Xiaoming to return directly the data that the JSON should serialize: var xiaoming = {    name: ' Xiaoming ',    age:14,    Gender:true,    height:1.65,    grade:null,    ' middle-school ': ' \ ' w3c\ ' Middle school ',    skills: [' JavaScript ', ' Java ', ' Python ', ' Lisp '],    tojson:function () {        return {///output only Name and age, and changed key:            ' name ': this . Name,            ' age ': This.age        };    }; Json.stringify (xiaoming); ' {' Name ': ' xiaoming ', ' Age ': 14} '

　　

Deserialization

To get a string in JSON format, we use Json.parse () to turn it into a JavaScript object: Json.parse (' [1,2,3,true] '); [1, 2, 3, True]json.parse (' {"name": "Xiaoming", "Age": 14} '); Object {name: ' Xiaoming ', Age:14}json.parse (' true '); Truejson.parse (' 123.45 '); 123.45json.parse () can also receive a function that transforms the parsed attribute: Json.parse (' {' name ': ' Xiaoming ', ' age ': ' + ', function (key, value) {    // Put number * 2:    if (key = = = ' name ') {        return value + ' classmate ';    }    return value;}); Object {name: ' Xiao Ming classmate ', age:14} using JSON in JavaScript is that simple!

　

Source:

Http://www.liaoxuefeng.com/wiki/001434446689867b27157e896e74d51a89c25cc8b43bdb3000/ 001434499490767fe5a0e31e17e44b69dcd1196f7ec6fc6000

　　

JavaScript Json (GO)