对象形式的城市格式,转换成数组格式
let city_list = City.city_list let province_list = City.province_list Object.keys(province_list).forEach((prop, index) => { let start = prop.substr(0, 2) this.cityArr[index] = { label: province_list[prop], id: prop } this.cityArr[index].children = [] Object.keys(city_list).forEach((childrenProp, i) => { if (childrenProp.startsWith(start)) { let children = { label: city_list[childrenProp], id: childrenProp } this.cityArr[index].children.push(children) } }) })