2. Conversion between JSON objects and strings

For example, I have two variables, I want to convert a to a string and b to a JSON object:

1	var a={"name":"tom","sex":"男","age":"24"};

2

3	var b='{"name":"Mike","sex":"女","age":"29"}';

In Firefox, chrome, opera, safari, ie9, ie8 and other advanced browsers, you can directly use the stringify() and parse() methods of JSON objects.

JSON.stringify(obj) converts JSON to string. JSON.parse(string) converts the string to JSON format;

The above transformation can be written as:

01	var a={"name":"tom","sex":"男","age":"24"};

02

03	var b='{"name":"Mike","sex":"女","age":"29"}';

04

05	var aToStr=JSON.stringify(a);

06

07	var bToObj=JSON.parse(b);

08

09	alert(typeof(aToStr));  //string

10

11	alert(typeof(bToObj));//object

JSON.stringify()

ie8 (compatibility mode), ie7 and ie6 do not have JSON objects, but http://www.json.org/ provides a json.js, so that ie8 (compatibility mode), ie7 and ie6 can support JSON objects and their stringify( ) and parse() methods; you can get this js on https://github.com/douglascrockford/JSON-js , and generally use json2.js now.

ie8 (compatibility mode), ie7 and ie6 can use eval() to convert strings to JSON objects,

1	var c='{"name":"Mike","sex":"女","age":"29"}';

2	var cToObj=eval("("+c+")");

3	alert(typeof(cToObj));

 

jQuery also has the method jQuery.parseJSON( json ) to convert a string to JSON format , which accepts a standard format JSON string and returns the parsed JavaScript (JSON) object. Of course, if you are interested, you can encapsulate a jQuery extension yourself. jQuery.stringifyJSON(obj) converts JSON to string.