Determine the Version of .NET on a Client PC Using JavaScript

Use the following JavaScript to determine which .NET version is on a client PC:

<script language="JavaScript" type="text/javascript">var a = navigator.userAgent.match(/.NET CLR [0-9.]+/g);if (a == null)  document.write( ".NET Framework(s) is not installed" )else{  document.write( "The following versions of .NET Frameworks are installed:
" ) for (i = 0; i < a.length; ++i) { document.write( a[i] ) document.write( "
" ) } }
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