<template>
  <div class="dropdown" ref="dropdownRef">
    <a href="#" class="btn btn-outline-light my-2 dropdown-toggle" @click.prevent="toggleOpen">{{title}}</a>
    <ul class="dropdown-menu" :style="{display: 'block'}" v-if="isOpen">
        <slot></slot>
    </ul>
  </div>
</template>

<script lang="ts">
import { computed, defineComponent, ref, onMounted, onUnmounted } from 'vue'
export default defineComponent({
    name: 'DropDown',
    props: {
        title: {
            type: String,
            required: true
        }
    },
    setup () {
        const isOpen = ref(false)
        const dropdownRef = ref<null | HTMLElement>(null)
        const toggleOpen = () => {
            isOpen.value = !isOpen.value
        }
        const handler = (e: MouseEvent) => {
            console.log('点击')
            if (dropdownRef.value) {
                console.log(dropdownRef.value)
            }
        }
        onMounted(() => {
            document.addEventListener('clcik', handler)
        })
        onUnmounted(() => {
            document.removeEventListener('click', handler)
        })
        return {
            isOpen,
            toggleOpen,
            dropdownRef
        }
    }
})
</script>

<style>

</style>