confirm.js

sleep = ms => {
  return new Promise(resolve => setTimeout(resolve, ms));
};

const confirm = function() {
  console.log("###开始确认订单###");
  const url = chrome.runtime.getURL("user.json");
  fetch(url)
    .then(response => response.json()) //assuming file contains json
    .then(item => {
      console.log("###选择购票人###");
      document.getElementsByClassName("next-checkbox")[0].children[1].click(); //默认勾选首位购票人
      sleep(1000).then(() => {
        document.getElementsByClassName("express")[0].click(); // 选择自取
        sleep(2000).then(() => {
          if (document.title === "确认订单") {
            console.log("###选择购票人###");
            if (
              !document
                .getElementsByClassName("next-checkbox")[0]
                .classList.contains("checked")
            ) {
              document
                .getElementsByClassName("next-checkbox")[0]
                .children[1].click(); //默认勾选首位购票人
            }
            //document.getElementsByClassName('next-checkbox')[0].children[1].click() //默认勾选首位购票人
            sleep(500).then(() => {
              console.log("###确认购买###");
              document
                .getElementsByClassName("submit-wrapper")[0]
                .children[0].click();
            });
          }
        });
        //}
      });
    });
};

confirm();