This method returns a JSON string.
string.toJSON() ;
<html> <head> <title>Prototype examples</title> <script type="text/javascript" src="/javascript/prototype.js"> </script> <script> function showResult(){ var str = 'The "Quoted" chronicles'; alert("JSON String : " + str.toJSON() ); } </script> </head> <body> <p>Click the button to see the result.</p> <br /> <br /> <input type="button" value="Result" onclick="showResult();"/> </body> </html>
To understand it in better way you can Try it yourself.
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