vue中省市区

:load-data="loadData"指：从后端查询出的全部的省市区数据

 loadData(item, callback) {
      item.loading = true
      if (item.flag === 0) {
        let url = '/listCityByProvinceCode'
        this.$get(
            url,
            { provinceCode: item.value },
            (res) => {
              let result = res.data
              if (result.status == 200) {
                let data = result.data
                for (let i in data) {
                  let city = {}
                  city.label = data[i].cityName
                  city.value = data[i].cityCode
                  city.flag = 1
                  if (item.value != '820000') {
                    city.children = []
                    city.loading = false
                  }
                  item.children.push(city)
                }
                callback()
                item.loading = false
              } else {
                this.$toast(result.msg)
              }
            },
            (err) => {
              this.$hideMark()
              this.$toast(this.networkerr)
              item.loading = false
            }
        )
      }

      if (item.flag === 1) {
        let url = '/listAreaByCityCode'
        this.$get(
            url,
            { cityCode: item.value },
            (res) => {
              let result = res.data
              if (result.status == 200) {
                let data = result.data
                for (let i in data) {
                  let city = {}
                  city.label = data[i].areaName
                  city.value = data[i].areaCode
                  // city.children = [];
                  // city.loading = false;
                  city.flag = 2
                  item.children.push(city)
                }
                callback()
                item.loading = false
              } else {
                this.$toast(result.msg)
              }
            },
            (err) => {
              this.$hideMark()
              this.$toast(this.networkerr)
              item.loading = false
            }
        )
      }
    },
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:data="cityData"指：
cityData=[],
//获取省份列表
listProvince() {
let url = ‘/listProvince’
this.KaTeX parse error: Expected '}', got 'EOF' at end of input: … this.toast(result.msg)
}
},
(err) => {
this.$hideMark()this.$toast(this.networkerr)
}
)
},
@on-change=“cityChange”：选择省市区这个动作

    cityChange(value, selectedData) {
      //let regionId=this.formValidate.regionFlag;
      this.provinceCodeId = selectedData[0].value
      console.log(selectedData)
      console.log(selectedData[0].value)
      console.log(selectedData.length)
      //this.formValidate.cityData2=selectedData;
      this.cityMsg = ''
      if (selectedData != null && selectedData.length > 0) {
        for (let i in selectedData) {
          if (i == 0) {
            this.formData.province = selectedData[0].value
          }
          if (i == 1) {
            this.formData.city = selectedData[1].value
          }
          if (i == 2) {
            this.formData.area = selectedData[2].value
          }
        }
      }
    },
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v-model=“formData.cityData2”：选择好绑定的省市区参数

 <Row :gutter="16">
              "12">
              "省/市/区" prop="cityData2">
               <Cascader
                       :data="cityData"
                       v-model="formData.cityData2"
                       @on-change="cityChange"
                       filterable
                       :clearable=false
                       :load-data="loadData"

               >
             
              
              

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