How to Determine the Operating System of the Client Machine with JavaScript
To determine the operating system of the client machine on which a browser is executing JavaScript, use the appVersion property of the JavaScript navigator object, as demonstrated in the following example:
document.write(navigator.appVersion);
The information given in this property can be extrapolated, albeit in a somewhat rudimentary way, to determine whether the operating system is Windows or Macintosh, as shown below:
var strOS = navigator.appVersion;
if (strOS.toLowerCase().indexOf('win') != -1)
document.write('Windows');
else if (strOS.toLowerCase().indexOf('mac') != -1)
document.write('Macintosh');
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