Vue子组件向父组件传值

<template>
    <div id="index">
        <h1>this is index</h1>
        <my-header @sendMessage='getMessage'></my-header>   
    </div>
</template>

<script>
    import myHeader from './header'
    export default{
        components:{
            myHeader
        },
        data(){
            return {
            }
        },
        methods:{
            getMessage(data){
                console.log(data);
            }
        }
    }
</script><template>
    <div id="index">
        <h1>thi