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js判断访问媒体介质

<script type="text/javascript">
 var userAgent = navigator.userAgent.toLowerCase(),
 userTerminal = userAgent.match( /ipad/i ) ||
 userAgent.match( /iphone os/i ) ||
 userAgent.match( /midp/i ) ||
 userAgent.match( /ucweb/i ) ||
 userAgent.match( /android/i );
  
 if( userTerminal == ‘ipad‘ )
 {
 document.write( ‘<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=0">‘ );
 document.write( ‘<meta name="apple-mobile-web-app-capable" content="yes">‘ );
 document.write( ‘<meta name="apple-mobile-web-app-status-bar-style" content="black">‘);
 }
 else if( userTerminal == ‘iphone os‘ )
 {
 document.write( ‘<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=0">‘ );
 document.write( ‘<meta name="apple-mobile-web-app-capable" content="yes">‘ );
 document.write( ‘<meta name="apple-mobile-web-app-status-bar-style" content="black">‘ );
 }
 else if( userTerminal == ‘midp‘ )
 {
 document.write( ‘<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=0">‘ );
 document.write( ‘<meta name="apple-mobile-web-app-capable" content="yes">‘ );
 document.write( ‘<meta name="apple-mobile-web-app-status-bar-style" content="black">‘ );
 }
 else if( userTerminal == ‘android‘ )
 {
 document.write( ‘<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=0">‘ );
 };
 </script>