bindRegionChange(e) {

      this.openCity()

      let cityName = e.detail.value[1]

      this.data.cityList.map((item) => {

        if (item.townName === cityName.substring(0, 2)) {

          console.log(item.townId)

          this.setData({

            schoolTownId: item.townId,

            schoolType: ‘HIGH_SCHOOL’,

            schoolName: ‘’,

            changeColor: true

          })

        }

      })

      this.setData({

        region: cityName.substring(0, cityName.length - 1)

      })

    },

    //选择高中后确定

    saveCity() {

      this.setData({

        schoolName: this.data.region + ‘-高中生’,

        isSchool: false

      })

    }

this.dataList是一个接口返回的城市数据，使用townName跟官方的picker的townName匹配。拿到townId即可