百度地图 -- 城市列表控件点击除控件外的区域自动触发关闭

1.全局添加点击事件的监听

 window.addEventListener('click', this.clickOutSelectCity); // 监听是否点击除城市列表控件以外的区域

2.判断点击的dom是否在城市列表控件(class为 .BMap_CityListCtrl’)外，在外则触发控件的关闭按钮（id为 #popup_close）点击事件

  clickOutSelectCity = (e) => {
  	const outSelectCity = !this.hasParents(e.target, '.BMap_CityListCtrl'); // 点击城市选择器以外的区域
    const citylist_popup_main = document.querySelector('.citylist_popup_main');
    const selectCityIsOpen = citylist_popup_main && citylist_popup_main.style.display === 'block' ? !0 : !1; // 城市选择器是否展开
    if(outSelectCity && selectCityIsOpen) {
      this.triggerClick();
    }
  }

以下为用到的方法代码（hasParents和triggerClick）：

 hasParents = (elClass, parentSelectorClass) => {
    if (!elClass || !parentSelectorClass) {
      return false;
    }
    let [el, parentsSelectors] = [elClass, parentSelectorClass];
    if (typeof elClass === 'string') {
      el = document.querySelector(elClass);
      if (!el) {
        return false;
      }
    }
    if (typeof parentsSelectors === 'string') {
      parentsSelectors = document.querySelectorAll(parentsSelectors);
    } else {
      parentsSelectors = [...parentsSelectors];
    }
    let hasParents = false;
    for (let i = 0; i < parentsSelectors.length; i++) {
      let p = el.parentNode;
      while (p !== parentsSelectors[i]) {
        if (!p || p  === document) {
          break;
        }
        p = p.parentNode;
      }
      if (p === parentsSelectors[i]) {
        hasParents = true;
      }
    }
    return hasParents;
  };

 triggerClick = () => { // 自动触发城市列表控件的关闭按钮
    const closeBtn = document.getElementById("popup_close");
    if(document.all) {
      closeBtn.click();
    } else {
      const e = document.createEvent("MouseEvents");
      e.initEvent("click", true, true);
      closeBtn.dispatchEvent(e);
    }
  }

3. 页面离开后记得移除点击事件的监听

 window.removeEventListener('click', this.clickOutSelectCity);