<!-- 子组件 -->
<template>
    <div>
        <button @click="emitSomeThing">发送</button>
    </div>
</template>
<script>
export default {
    methods: {
        emitSomeThing() {
            this.$emit('change', '子组件传递的数据')
        }
    }
}
</script>
<!-- 父组件 -->
<template>
    <div>
        <Child @change="onChange"></Child>
    </div>
</template>
<script>
export default {
    methods: {
        // 接收子组件传递的数据
        onChange(event) {
            console.log(event) 
        }
    }
}
</script>