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How to find the Operating sysetm(OS) name using JavaScript?

<html>
    <title>
        How to find the Operating sysetm(OS) name using JavaScript?
    </title>
    <script>
        function find_browser()
        {
            var nAgt = window.navigator.userAgent;
            if (nAgt.indexOf('Mac') != -1) {
                alert('Mac OS');
            }else if (nAgt.indexOf('Linux') != -1) {
                alert('Linux');
            }else if (nAgt.indexOf('X11') != -1) {
                alert('Unix');
            }else if (nAgt.indexOf('Windows NT 6.2') != -1) {
                alert('Windows 8');
            }else if (nAgt.indexOf('Safari') != -1) {
                alert('Windows 7');
            }else if (nAgt.indexOf('Windows NT 6.0') != -1) {
                alert('Windows Vista');
            }else if (nAgt.indexOf('Windows NT 5.1') != -1) {
                alert('Windows XP');
            }else if (nAgt.indexOf('Windows NT 5.0') != -1) {
                alert('Windows 2000');
            }  
        }
    </script>
    <body onload="find_browser()">
        <h1> Find the Operating sysetm(OS) name using JavaScript? </h1>
    </body>
</html>

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