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Ввод в input только число на jQuery

$(".spin").keydown(function(event) {
       // Allow: backspace, delete, tab, escape, enter and .
 if ( $.inArray(event.keyCode,[46,8,9,27,13,190]) !== -1 ||
                 // Allow: Ctrl+A
             (event.keyCode == 65 && event.ctrlKey === true) || 
                // Allow: home, end, left, right
             (event.keyCode >= 35 && event.keyCode <= 39)) {
                      // let it happen, don't do anything
                   return;
  }
 else {
            // Ensure that it is a number and stop the keypress
               if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105 )) {
                   event.preventDefault(); 
          }   
      }
});