基于Vue3文件拖拽上传功能实现

<template>
    <div :class="['drag', { 'drag-active': active }]" ref="drag">
        <p class="drag-title">未选择文件/文件夹</p>
        <p class="drag-subtile">
            支持拖拽到此区域上传，支持选择多个文件/文件夹
            <br />
            单个文件夹最大支持512GB
        </p>
    </div>
</template>
<script setup>
import { ref, onMounted, onBeforeUnmount } from 'vue'
const drag = ref(null)
const active = ref(false)
onMounted(() => {
    drag.value.addEventListener('drop', handleDrop)
    drag.value.addEventListener('dragleave', (e) => {
        active.value = false
        e.preventDefault()
    })
    drag.value.addEventListener('dragenter', (e) => {
        active.value = true
        e.preventDefault()
    })
    drag.value.addEventListener('dragover', (e) => {
        active.value = true
        e.preventDefault()
    })
})

onBeforeUnmount(() => {
    drag.value.removeEventListener('drop', handleDrop)
})

const emit = defineEmits(["file"])
const handleDrop = (e) => {
    e.preventDefault()
    active.value = false
    emit("file", Array.from(e.dataTransfer.files))
}

</script>

<style lang="scss" scoped>
.drag {
    height: 220px;
    border: 1px dashed #DEDEDE;
    border-radius: 4px;
    display: flex;
    align-items: center;
    flex-direction: column;
    justify-content: center;

    &-active {
        border: 1px dashed #2260FF;
    }

    &-title {
        font-size: 14px;
    }

    &-subtile {
        font-size: 12px;
        color: #999999;
        margin-top: 30px;
        text-align: center;
        line-height: unset;
    }
}
</style>