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Element提供了upload上传组件，可以查看官网upload组件的详细介绍；查看upload组件的上传源码upload/ajax，使用的是XHR对象上传文件。在项目实践中，发现该上传方法上传大文件时会出现问题，所以决定使用阿里云对象存储服务（Object Storage Service，简称OSS），OSS详细介绍可以查看官网，本文主要讲解的是OSS上传文件的前端，后台开发请查看官网介绍，SDK Browser.js讲解了前端如何进行上传。
1、使用npm安装SDK的开发包：
npm install ali-oss
2、OSS配置
let OSS = require('ali-oss');
let client= new OSS.Wrapper({accessKeyId: 'your access key',accessKeySecret: 'your access secret',bucket: 'your bucket name',region: 'oss-cn-hangzhou'
});
最新版的没有了Wrapper构造函数，直接配置
let oss = require('ali-oss');
var client = oss({accessKeyId: 'your access key',accessKeySecret: 'your access secret',bucket: 'your bucket name',region: 'oss-cn-hangzhou'
});
3、上传文件
OSS上传文件分为上传Buffer内容、上传blob数据、分片上传，此处展示分片上传
let result = await client.multipartUpload('object-key', 'local-file', {progress: async function (p) {console.log('Progress: ' + p);}});
js调用OSS上传文件已经没有问题，但是我们需要实现公用上传组件，Element UI已经实现了Upload上传组件，包括上传进度、异常处理、拖拽等；那我们还有必要重新开发一个像Upload一样的组件吗？通过查看Upload组件的API发现有一个http-request属性，http-request覆盖默认的上传行为，可以自定义上传的实现；看到这个我就省了很多事，直接用OSS上传覆盖XHR上传。代码如下：
<template><div><el-upload:auto-upload="false":action="uploadUrl"ref="upload":before-upload="fnBeforeUpload":on-success="fnUploadSuccess":on-exceed="fnUploadExceed":data="data_extra":headers="uploadHeaders":http-request="fnUploadRequest"drag:limit="files":disabled="disabled"multiple><i class="el-icon-upload"></i><div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div><div slot="tip" class="el-upload__tip">上传文件大小不能超过 1G</div></el-upload></div>
</template>
<script>
import UploadFileApi from '@/api/system/UploadFileApi'
import OSS from 'ali-oss'
export default {name: 'fileUpload',props: {data_extra: {type: Object,required: true},accept: {type: Array,required: true}},data () {return {uploadUrl: '',fileList: [],files: 10,uploadHeaders: {authorization: ''},disabled: false}},methods: {/*** @description [fnUploadRequest 覆盖默认的上传行为，实现自定义上传]* @author shanshuizinong* @param {object} option [上传选项]* @return {null} [没有返回]*/async fnUploadRequest (option) {try {let vm = thisvm.disabled = true// 获取OSS配置信息let uploadFileApi = new UploadFileApi()let ret = await uploadFileApi.fileOssParams()if (!(ret.data && ret.data.code === '0' && ret.data.data)) {throw new Error('获取OSS参数失败')}let ossData = JSON.parse(ret.data.data)let relativePath = ossData.relativePathlet client = new OSS.Wrapper({policy: ossData.policy,accessKeyId: ossData.accessid,accessKeySecret: ossData.accesssecret,bucket: ossData.bucket,signature: ossData.signature})let file = option.fileconst point = file.name.lastIndexOf('.')let suffix = file.name.substr(point)let fileName = file.name.substr(0, point)let date = vm.$moment().format('YYYYMMDDHHmm')let fileNames = `${fileName}_${date}${suffix}`// 分片上传文件ret = await client.multipartUpload(relativePath + fileNames, file, {progress: async function (p) {let e = {}e.percent = p * 100option.onProgress(e)}})console.log(ret)if (ret.res.statusCode === 200) {// option.onSuccess(ret)return ret} else {vm.disabled = falseoption.onError('上传失败')}} catch (error) {console.error(error)this.disabled = falseoption.onError('上传失败')this.$error(error.message)}},/*** @description [fnUploadSuccess 文件上传成功的函数]* @author shanshuizinong* @return {null} [没有返回]*/async fnUploadSuccess () {// TODO}}
}
</script>查看upload源码upload.vue知道httpRequest会有一个文件上传的option选项作为参数，upload/ajax源码中上传进度、上传成功、上传失败都是通过option调用其方法进行触发。