el-cascader v-model="dataform.business" @change="changes()"，加@change事件不会显示选中是文本，如何在@change事件处理这个问题

Question

<el-cascader :options="option" v-model="dataform.business" @change="changes()">
                            <template slot-scope="{ node, data }">
                                <span>{{ data.label }}</span>
                                <span v-if="!node.isLeaf"> ({{ data.children.length }}) </span>
                            </template>
                        </el-cascader>

console.log(this.dataform.business, 'bus');
            this.dataform.business = this.dataform.business[0] + '——' + this.dataform.business[1]
            console.log(this.dataform.business, 'bus1');
            

Answer 1

 this.$set('this.dataform','business',this.dataform.business[0] + '——' + this.dataform.business[1])