code is as follows: 
 < el-radio-group VMI model = "afsapplyForm.customerExpect" @ change= "changeCustomerExpect" > 
      <el-radio :label="key" value="key" v-for="(value, key) in afsapplyForm.customerExpectMap" >
           {{value}}
      </el-radio>
< / el-radio-group >
 data binding 
 data () {
  return {
    afsapplyForm: {
      customerExpect: ""
      }}
radio cannot be selected when clicked. What is the matter?
