el-radio再次点击取消选中

// 直接把 radio单选换成多选框，然后设置 max最大为1，这个需要把选中的点没，才能再去选择别的

<el-checkbox-group v-model="checkList" :max="1">
    <el-checkbox label="选项 A"></el-checkbox>
    <el-checkbox label="选项 B"></el-checkbox>
    <el-checkbox label="选项 C"></el-checkbox>
</el-checkbox-group>

data () {
    return {
        checkList: [‘选项A‘]
    }
}

<el-radio-group v-model="radio2">
  <el-radio @click.native.prevent="clickitem(3)" :label="3"> 备选项</el-radio>
  <el-radio @click.native.prevent="clickitem(6)" :label="6"> 备选项</el-radio>
  <el-radio @click.native.prevent="clickitem(9)" :label="9"> 备选项</el-radio>
</el-radio-group>

clickitem (e) {
  e === this.radio2 ? this.radio2 = ‘‘ : this.radio2 = e
}