elementui自带单选框不能取消, 可以通过点击事件来进行值的修改,代码如下

   <el-form-item label="">
      <el-radio-group v-model="resource">
       <el-radio :label="true" @click.native.prevent="clickItem(true)">线上品牌商赞助</el-radio>
      </el-radio-group>
    </el-form-item>

export default {
    data() {
        return {
            resource: false,
        };
    },
    methods: {
        clickItem(value) {
            value === this.resource ? this.resource = "" : this.resource = value
        },
    },
};