补充 加载多级(省市区)

// 设置prop属性   props:{    label: 'areaName',    value: 'areaId',    //children: 'children',   },       // 获取省市    getProvence() {      post(url, {parentId: 0}).then((res) => {        this.addressObject.list = res && res.data || []        this.addressObject.list.forEach((item,index)=>{          this.$set(this.addressObject.list[index], 'children', [])        })      })    },    // 级联选择器    handleAddressChange(val) {      if(val.length <= 0 ) return;      let provinceList = this.addressObject.list;      let provinceLength = provinceList.length;      let provinceAreaId = val[0];      if(val.length === 1)  {         // 省areaId, 获取省下面所有的市        post(url, {parentId: provinceAreaId}).then((res) => {          for(let i = 0; i < provinceLength; i++) {            if(provinceList[i].areaId === provinceAreaId) {              this.$set(provinceList[i], 'children', res && res.data  || []);              provinceList[i].children.forEach((item,index)=>{                 this.$set(provinceList[i].children[index], 'children', [])              })              break;            }          }        })      }      if(val.length === 2)  {        let cityId = val[1]; // 市areaId,获取市下面所有的区        post(url, {parentId: cityId}).then((res) => {          for(let i = 0; i < provinceLength; i++) {            if(this.addressObject.list[i].areaId === provinceAreaId) {              let findProvince = this.addressObject.list[i];              let cityList = findProvince.children;              let cityLength = cityList.length;              for(let j = 0; j < cityLength; j++){                  if(cityList[j].areaId === cityId) {                    this.$set(cityList[j], 'children', res && res.data  || []);                    break;                  }//if              }//for              break;            }//if          }//for        })      }    },复制代码