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CSSStyleDeclaration JS Conversion


JavaScript JSON-verwysing


JSON ( J ava Skrip objeknotasie ) _ _ _

JSON is 'n formaat vir die stoor en vervoer van data.

JSON is teks, en teks kan oral vervoer word en deur enige programmeertaal gelees word.

JavaScript-objekte kan in JSON omgeskakel word, en JSON kan terug na JavaScript-objekte omgeskakel word.

Op hierdie manier kan ons met die data as JavaScript-objekte werk, sonder ingewikkelde ontleding of vertalings.

Voorbeeld

Stuur tans JSON:

// a JavaScript object...:
var myObj = { "name":"John", "age":31, "city":"New York" };

// ...converted into JSON:
var myJSON = JSON.stringify(myObj);

// send JSON:
window.location = "demo_json.php?x=" + myJSON;

Vir 'n tutoriaal oor JSON, lees ons JSON-tutoriaal .


JSON metodes

Method Description
parse() Parses a JSON string and returns a JavaScript object
stringify() Convert a JavaScript object to a JSON string

Geldige datatipes

In JSON moet waardes een van die volgende datatipes wees:

  • 'n toutjie
  • n nommer
  • 'n objek (wat geldige JSON-waardes bevat)
  • 'n skikking
  • 'n boolean
  • nul

JSON-waardes kan nie een van die volgende datatipes wees nie:

  • 'n funksie
  • n datum
  • ongedefinieerd

Meer voorbeelde

Voorbeeld

Ontvang JSON:

// myJSON is text received in JSON format.
// Convert JSON into a JavaScript object:
var myObj = JSON.parse(myJSON);
document.getElementById("demo").innerHTML = myObj.name;

Voorbeeld

Stoor data as JSON, met behulp van localStorage

// Storing data:
myObj = { "name":"John", "age":31, "city":"New York" };
myJSON = JSON.stringify(myObj);
localStorage.setItem("testJSON", myJSON);

// Retrieving data:
text = localStorage.getItem("testJSON");
obj = JSON.parse(text);
document.getElementById("demo").innerHTML = obj.name;

Kom meer te wete oor JSON in ons JSON-tutoriaal .