$(document).ready(function () {

    $('body').on('keydown keyup', function( e ) {

      var key = e.which;

      var io  = e.type=="keydown" ? 0 : 1; // "0"if keydown; "1" if keyup

      var keyAction = {                    // Object to store our stuff

//  keyCode : [(0)KEYDOWN, (1)KEYUP]

        82  : ['red' ,'white'],            // R key

        66  : ['blue','white']             // B key  (last one without comma!)

      };

      var propObj = {};                    // Object to store property + value for jQuery methods

      var keyArr = keyAction[key];

​

      if(typeof keyArr != 'undefined') {   // Test keyArr (82, 66) is returned/populated to prevent errors

         propObj.background = keyAction[key][io];   // Created the jQ Method's object e.g: {background:"red"}

         $(this).css(propObj);             // Finally create / use 

      }

​

    });

​

});