<div class="block">

            <span class="demonstration">默认 click 触发子菜单</span>

            <el-cascader

                v-model="value"

                :options="options"

                @change="handleChange"></el-cascader>

        </div>

            value:[],

            options:[

                {

                    value: 'zhinan',

                    label: '指南',

                    children:[

                        {

                            value: 'shejiyuanze',

                            label: '设计原则',

                            children:[

                                {

                                    value: 'yizhi',

                                    label: '一致'

                                },

                                {

                                    value: 'fankui',

                                    label: '反馈'

                                }

                            ]

                        }

                    ]

                }

            ]    

        handleChange(value) {

            console.log(value);

        }