JSON and JS objects

Json

• Definition: is a format for data exchange.

Javascript objects

• Definition: A type of reference for JavaScript
• Difference

  Compare content	Json	Javascript objects
  Key Name	Must be double-quoted	You can add single quotes, double quotes, or do not add
  Property value	Can only be numeric values (10 binary), string (double quotes), Boolean and null, can also be arrays, JSON-compliant objects, cannot be functions, nan,infinity,-infinity and undefined	Any value in JavaScript
  Comma problem	The last value cannot be followed by a comma	can have commas
  Numerical problems	Leading cannot be 0, there will be a value after the decimal point	All can

  json.stringify function

  Function: Turns the object into a JSON string, thus ignoring the field where the property value does not match the JSON

  var test = {    ' good ',    ' both ': ' Man ',    ' three ' : Undefined,    ' Four ': [1, 2 ],    function() {        return ' test '      //"{" One ":" Good "," one ":" Man "," four ": [+]}"

Conversion between JSON and JS objects

1. How the jquery plugin supports conversion

$.parsejson (JSONSTR); Jquery.parsejson (JSONSTR), you can convert a JSON string into a JSON object

2. Browser supported conversion mode (FIREFOX,CHROME,OPERA,SAFARI,IE9,IE8) and other browsers:

Json.parse (JSONSTR); You can convert a JSON string into a JSON object
Json.stringify (Jsonobj); You can convert a JSON object to a JSON string

Note: IE8 (compatibility mode), IE7 and IE6 do not have JSON objects, it is recommended to use the official JSON method, the introduction of Json.js.

3. How JavaScript supports conversion

Eval (' (' + jsonstr + ') '); You can convert a JSON string to a JSON object, noting that you need to wrap a pair of parentheses outside the JSON character
Note: IE8 (compatibility mode), IE7 and IE6 can also use eval () to convert strings to JSON objects, but these methods are not recommended, which is unsafe for eval to execute an expression in a JSON string.

4. The official JSON conversion method:

http://www.json.org/provides a json.js so that IE8 (compatibility mode), IE7 and IE6 can support JSON objects as well as their stringify () and Parse () methods;
Can get this JS on Https://github.com/douglascrockford/JSON-js, generally now use json2.js.

JSON and JS objects