我希望读取这段代码中city2的长度该怎么办function useCascaderAreaData const city_list city county_list county province_list province = areaList; const provinceMap = __PURE__ new Map; Objectkeysprovince

要读取city2的长度，可以使用city2.children.length来获取。修改代码如下：

function useCascaderAreaData() {
  const {
    city_list: city,
    county_list: county,
    province_list: province
  } = areaList;
  const provinceMap = /* @__PURE__ */ new Map();
  Object.keys(province).forEach((code) => {
    provinceMap.set(code.slice(0, 2), makeOption(province[code], code, []));
  });
  const cityMap = /* @__PURE__ */ new Map();
  Object.keys(city).forEach((code) => {
    const option = makeOption(city[code], code, []);
    cityMap.set(code.slice(0, 4), option);
    const province2 = provinceMap.get(code.slice(0, 2));
    if (province2) {
      province2.children.push(option);
    }
  });
  Object.keys(county).forEach((code) => {
    const city2 = cityMap.get(code.slice(0, 4));
    if (city2.children.length === 1) {
      city2.children.push(makeOption(county[code], code));
    }
  });
  return Array.from(provinceMap.values());
}

在代码的最后，使用city2.children.length来获取city2的长度