Get error message : onerror : Window JAVASCRIPT TUTORIALS

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Get error message



<html>
    <head>
        <title>OnError Example</title>
        <script type="text/javascript">
            window.onerror = function (sMessage, sUrl, sLine) {
                alert("An error occurred:n" + sMessage);
                return true;
            }
        </script>
    </head>
    <body onload="nonExistentFunction()">
    </body>
</html>