vue3+element plus 封装上传组件（图片、文件）

1、新建封装组件components/upload.vue

<template>
  <el-upload 
  	v-model:file-list="waitFileList" 
  	class="upload-demo" 
  	:on-change="handleChange" 
  	multiple 
  	:auto-upload="false"
    :on-preview="handlePreview" 
    :on-remove="handleRemove" 
    :before-remove="beforeRemove" 
    :limit="limitNum"
    :on-exceed="handleExceed"
  >
    <el-button type="primary">上传文件</el-button>
    <template #tip>
      <div class="el-upload__tip">
        支持jpg/jpeg/png；图片大小不能超过2M；文件大小不超过20M；最多上传{{ limitNum }}个文件
      </div>
    </template>
  </el-upload>
</template>
<script setup>
import { ref, watch } from 'vue'
import { ElMessage, ElMessageBox, ElLoading } from "element-plus"
import { uploadFileApi } from '../api/upload'
const props = defineProps({
  action: {
    default: '/manager/energy/common/upload',
    type: String,
  },
  limitNum: {
    default: 5,
    type: Number,
  },
  type: {
    default: 1,
    type: Number,
  },
  projectId: {
    default: '',
    type: String,
  },
  fileList: {
    default: [],
    type: Array
  }
})

let waitFileList = ref([])
waitFileList.value = props.fileList
watch(
  () => props.fileList,
  () => {
    console.log("props.fileList====>", props.fileList)
    waitFileList.value = props.fileList
  }
)

const emits = defineEmits(["uploadSuccess", "updateFile"])

// 上传图片/文件
const handleChange = async (file, fileList) => {
  console.log(file)
  console.log(fileList)
  let rawFile = file.raw
  if (
    rawFile.type == "image/jpeg" && rawFile.size / 1024 / 1024 > 2 ||
    rawFile.type == "image/png" && rawFile.size / 1024 / 1024 > 2 ||
    rawFile.type == "image/jpg" && rawFile.size / 1024 / 1024 > 2
  ) {
    ElMessage.error("图片大小不能超过2MB!")
    fileList.splice(-1, 1) //移除当前超出大小的文件
    return false
  } else if (rawFile.size / 1024 / 1024 > 10) {
    ElMessage.error("文件大小不能超过10MB!")
    fileList.splice(-1, 1) //移除当前超出大小的文件
    return false
  } else {
    console.log('上传')
    const loadingInstance = ElLoading.service({
      text: "正在上传",
      background: "rgba(0,0,0,.2)",
    })
    // 请求接口上传文件到服务器
    console.log(rawFile)
    const res = await uploadFileApi(rawFile, props.projectId, props.type)
    console.log(res)
    if (res.code == 200) {
      loadingInstance.close()
      const obj = res.result
      console.log(11)
      emits("uploadSuccess", obj)
    } else {
      loadingInstance.close()
      console.log(22)
      ElMessage.warning(`上传失败`)
    }
  }
  return true
}


const handleRemove = (file, uploadFiles) => {
  console.log(file)
  console.log(uploadFiles)
  emits('updateFile', uploadFiles)
}

const handlePreview = (uploadFile) => {
  console.log(uploadFile)
}

const handleExceed = (files, uploadFiles) => {
  ElMessage.warning(
    `The limit is 3, you selected ${files.length} files this time, add up to ${files.length + uploadFiles.length
    } totally`
  )
}

const beforeRemove = (uploadFile, uploadFiles) => {
  return ElMessageBox.confirm(
    `确定移除 ${uploadFile.name}文件 ?`
  ).then(
    () => true,
    () => false
  )
}
</script>

2、引入upload组件

<template>
	<upload 
		:limitNum="12" 
		:type="4" 
		:projectId="explorationFormData.projectId"
        :fileList="explorationFormData.distributionRoom"
         @uploadSuccess="handleDistributionRoom"
         @updateFile="updateDistributionRoom"
     >
    </upload>
</template>
<script setup>
// 引入上传文件
import upload from '@/components/upload.vue'
const explorationFormData = ref({
	projectId: '',
	projectName: '',
	scene: [],  // 现场
	installationSite: [],  // 安装场地
	installationSiteOverview: '',  // 安装场地概述
	distributionRoom: [],  // 配电房
	distributionRoomOverview: '',  // 配电房概述
})
// 处理配电房上传成功信息
const handleDistributionRoom = (file) => {
  console.log(file)
  explorationFormData.value.distributionRoom.push(file)
}
// 更新配电房文件
const updateDistributionRoom = (files) => {
  console.log(files)
  explorationFormData.value.distributionRoom = files
}
</script>

3、效果展示