var show=document.getElementsByClassName("reference_hidden");
var reference_btn=document.getElementsByClassName("reference_btn");
var flag=1;

function reference_show_list(){
   Array.from(document.getElementsByClassName("reference_hidden")).forEach(function(element){
      var index = element.className.split("reference_show")[1] * 1;
      if(index==flag){
         element.style.display="block";
         reference_btn[flag-1].style.color="#ffb867";
      }
      else{
         element.style.display="none";
         reference_btn[index-1].style.color="#646464";
      }
   })
}
reference_show_list();

function reference_list(list_number){
   flag=list_number;
   reference_show_list();
}