const infInput = document.getElementById('inflow_input_wrap').children;
const inflow_txt = "トップページ";
if (inflow_txt != null){
  infInput['inflow'].value = inflow_txt;
}

const referrerInput = document.getElementById('referrer_input_wrap').children;
const referrer_txt = document.referrer;
if (referrer_txt != null){
  referrerInput['referrer'].value = referrer_txt;
}