我想从类函数外部获取子组件文件

函数saveSurveyData（survey）需要调用父函数 handletabs （）

class Parent extends React.Component {

        constructor(props){
            super(props);       
            this.handletabs = this.handletabs.bind(this);
        }

         handletabs = () => {
            console.log('expecting call from Child component - function 
         }


         render() {   
            return (
                <Tab eventKey={1} title="child">
                    <Child handletabs={this.handletabs} />
                </Tab> 

            )
        }
    }

// Child Component

import React from 'react';
    import * as Survey from "survey-react";

    var surveyValueChanged = function (sender,options) {
        saveSurveyData(survey);
    };
    // critical surveyjs function
    function saveSurveyData(survey) {
        var data = survey.data;

        //need to call handletabs() (parent) in this function which is outside of Child Component Class
        //handletabs={this.handletabs}
        this.handletabs();  // HOW ?
    }

    class Child extends React.Component {
        constructor(props){
            super(props);

        }

        render()
            {
                return(
                    <Survey.Survey model={survey}
                        onValueChanged={surveyValueChanged} />
                )
            }
                }

我一直在尝试ref，props和state-我只是不了解如何在子组件之外执行此操作。