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Check Exception type with instanceof operator

< html> <head> <title>Try Catch Example</title> <script type="text/javascript"> try {     eval("a ++ b");        //causes SyntaxError } catch (oException) {     if (oException instanceof SyntaxError) {         alert("Syntax Error: " + oException.message);     } else {         alert("An unexpected error occurred: " + oException.message);     } } </script> </head> <body> </body> </html>