javascript - How to get the height and width of window in bootstrap -

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in bootstrap have fixed top nav bar , fixed bottom nav bar. want show large image in background between space of 2 nav bars , want cover width of window. how can dynamically height between navbars , width of window? window size may change depending on device.so need dynamic

$(window).resize(function() {     var top_nav_height = $("#id_of_top_nav").height();     var bottom_nav_height = $("#id_of_bottom_nav").height();       var window_height = $(window).height();      var height_of_open_space = window_height - (top_nav_height+bottom_nav_height);      $("#id_of_img").css({          height:height_of_open_space+'px';     });  });

this fine if 0px padding , margin, if not values , subtract height_of_open_space before applying img height


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