JS String Conversion to josn object

During Ajax development projects, strings in JSON format are often returned to the front end, and the front end is parsed into JS objects (JSON ).

 

ECMA-262 (E3)The JSON concept is not written to the standard.ECMA-262 (E5)The concept of JSON in is formally introduced, including the Global JSON object and the tojson method of date.

 

1. Eval parsing. I'm afraid this is the earliest parsing method. As follows:

 

JS Code

1. FunctionStrtojson (STR ){
2. VaRJSON = eval ('('+ STR +')');
3. ReturnJSON;
4. }

 

Remember the parentheses on both sides of Str.

 

2. The new function format is weird. As follows:

 

JS Code

1. FunctionStrtojson (STR ){
2. VaRJSON = (NewFunction ("Return"+ Str ))();
3. ReturnJSON;
4. }

 

3. Use the global JSON object as follows:

 

JS Code

1. FunctionStrtojson (STR ){
2. ReturnJSON. parse (STR );
3. }

 

At present, IE8 (s)/firefox3.5 +/chrome4/safari4/opera10 has implemented this method. The following are some materials:

 

Http://blogs.msdn.com/ie/archive/2008/09/10/native-json-in-ie8.aspx

Https://developer.mozilla.org/en/Using_JSON_in_Firefox

 

JSON. parse must comply with JSON specifications strictly. If attributes are enclosed by quotation marks

 

JS Code

1. VaRSTR ='{Name: "Jack "}';
2. VaROBJ = JSON. parse (STR );// --> Parse error

 

Name is not enclosed in quotation marks. If JSON. parse is used, an exception is thrown in all browsers and parsing fails. The first two methods are fine.

 

 

For details, see the special implementation of JSON. parse in chrome.