Conversion between a JSON object and a string object in Javascript

JSON object
VaR JSON = {AA: True, BB: true };
VaR json1 = {AA: 'B', BB: {CC: True, DD: true }};
1: js json object operation
For (VAR item in JSON ){
Alert (item); // The result is AA, BB, And the type is string.
Alert (typeof (item ));
Alert (EV Al ("JSON." + item); // The result is true, and the true type is boolean.
EV Al ("JSON." + item + "= false;"); // change the value of the JSON object
}

2: how to convert a JSON object to a string object
1 /* *
2 * Convert a JSON object to a string
3 */
4 Function Json2str (o ){
5 VaR Arr = [];
6 VaR FMT =   Function (S ){
7 If ( Typeof S =   ' Object '   && S ! =   Null ) Return Json2str (s );
8 Return   / ^ (String | Number) $ / . Test ( Typeof S) ?   " ' "   + S +   " ' " : S;
9 }
10 For ( VaR I In O) Arr. Push ( " ' "   + I +   " ': "   + FMT (O [I]);
11 Return   ' { '   + Arr. Join ( ' , ' ) +   ' } ' ;
12 }
3: convert a String object to a JSON object
Function stringtojson (stringvalue)
{
EV Al ("Var thejsonvalue =" + stringvalue );
Return thejsonvalue;
}

4: Method for converting a JSON array to a string object (to remove the method above)
Function jsonarraytostringcfz (jsonarray)

VaR jsonarraystring = "[";
For (VAR I = 0; I <jsonarray. length; I ++ ){
Jsonarraystring = jsonarraystring + jsontostringcfz (jsonarray [I]) + ",";
}
Jsonarraystring = jsonarraystring. substring (0, jsonarraystring. Length-1) + "]";
Return jsonarraystring;
}
5 Use JSON. js JSON to convert string