<RadioGroup v-model="formData.deficiencyType">
              
                <Radio label="1"  :disabled="modalType=='C'?true:false" @click.native="cancelSelection(1)">1</Radio>
                <Radio label="2"  :disabled="modalType=='C'?true:false" @click.native="cancelSelection(2)">2</Radio>
              </RadioGroup>

method: 

cancelSelection(selectedLabel) {
          if(this.modalType === 'U'){
            if (this.formData.deficiencyType == selectedLabel) {
             this.formData.deficiencyType = '';
               console.log(" this.formData.deficiencyType1: " +  this.formData.deficiencyType);
            }else{
               this.formData.deficiencyType=selectedLabel
            }
            }
            console.log(" this.formData.deficiencyType: " +  this.formData.deficiencyType);
      },

点击红框中的区域可以取消选中状态

但是点击数字这块区域就不行，

上面方法中 把this.formData.deficiencyType 重置为'',但最后输出打印还是1