用于下拉和文本字段的带有$（this）的jQuery多选择器

$('#sb_Height_Questionnaire_afraid_of_heights ,
    #tf_Height_Questionnaire_afraid_of_heights').on('change',function(){                  
      if ($(this[0]).val() == 'Yes' || $(this[0]).val() == 'No'){
        $("#hf_Height_Questionnaire_afraid_of_heights").val("Are you afraid of heights:" 
         + $(this[0]).val() + $(this[1]).val());
      } 
});
$('#sb_Height_Questionnaire_afraid_of_heights ,