Vue中父组件传子组件

父组件代码：

<template>
    <section :class="menuMode === 'vertical' ? 'vertical-sub-nav' : 'sub-nav'">
        <el-menu :mode="menuMode" :default-active="defaultActive" :current-tab="currentTab" @select="handleSelect">
            <el-menu-item v-for="(data,ind) in subNavData[currentTab]" :index="data.i" :key="ind">
                <span class="p5">
                    {{data.title}}
                </span>
            </el-menu-item>
        </el-menu>
    </section>
</template>
<script>
    export default {
        name: 'NavMenu',
        data() {},
        props: {
            menuMode: {
                type: String,
                default: 'horizontal'
            },
            defaultActive: {
                type: String,
                default: '0'
            },
            currentTab: {
                type: String,
                default: '0'
            }
        }
    }
</script>

 子组件代码：

<mp-subnav default-active="0" current-tab="0"></mp-subnav>