父元件：

<el-dialog title="" @close="refresh" :visible.sync="userRoleVisible" @open="showAuthEvent">
    <user-role-panel ref="authPanel"></user-role-panel>
</el-dialog>

:標籤是根據子元件的名稱按駝峰命名中間用‘-’隔開。

import userRolePanel from './userrole';//引入子元件
export default {
    name: 'userList'
 
,
    components: {userRolePanel},//註冊元件
    methods: {
        parentCall () {
    　　　　      //authPanel <user-role-panel>標籤中ref的值
            this.$refs.authPanel.init(
            this.tempData.userName,
            this.tempData.userId,
            this.tempData.roleIds);
        }
    }
}

子元件：

 export default {
        name: 'userRole',
        data() {
            return {
                tempData: {
                    userId: undefined,
                    userName: undefined,
                    userRole: undefined
                }
            }
        methods: {
            init(uname, uid, rid) {
                    userId: uid,
                    userName: uname,
                    userRole: rid
                };
            }     
    }