var v; var vals = [ true, false, 0, 1, 0.0, '0', '', [], {}, null, undefined, NaN ]; $('button').on('click', function(){ var i = $(this).data('val'); var s = $(this).text(); v = vals[i]; $('#valView').html('「'+s+'」は'); docching(s, v); }); function docching(s, v){ if(v){ $('.__true').show(); $('.__false').hide(); } else { $('.__true').hide(); $('.__false').show(); } }