1( function() { 2 var is_webkit = navigator.userAgent.toLowerCase().indexOf( 'webkit' ) > -1, 3 is_opera = navigator.userAgent.toLowerCase().indexOf( 'opera' ) > -1, 4 is_ie = navigator.userAgent.toLowerCase().indexOf( 'msie' ) > -1; 5 6 if ( ( is_webkit || is_opera || is_ie ) && 'undefined' !== typeof( document.getElementById ) ) { 7 var eventMethod = ( window.addEventListener ) ? 'addEventListener' : 'attachEvent'; 8 window[ eventMethod ]( 'hashchange', function() { 9 var element = document.getElementById( location.hash.substring( 1 ) ); 10 11 if ( element ) { 12 if ( ! /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) 13 element.tabIndex = -1; 14 15 element.focus(); 16 } 17 }, false ); 18 } 19})(); 20