vueelementadmin-上传upload图片慢问题处理

前言

vue-element-admin自带上传图片组件，在使用的过程中发现上传速度很慢，尤其是上传一些大图需要耗时几十秒不能忍受。出现这种情况，是因为upload组件会将图片上传到action="https://httpbin.org/post" ，并返回转换成base64编码格式的数据。

格式类似：

data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAIBAQEBAQIBAQECAgICAgQDAgICAgUEBAMEBgUGBgYFBgYGBwkIBgcJBwYGCAsIC.....

而且有可能这个base64编码比上传源文件还要大。

这样做有两个缺点：

多一步上传文件到第三方网站（https://httpbin.org/post），并转码base64，其中大部分时间在这一步浪费的。
服务端在接收base64编码内容，还要将其处理成文件进行单独保存（base64编码内容太长，通常不会直接存入数据库），这给服务端带来不便。

还有一点就这种是必须图片和表单其他内容一起提交，有的时候上传和表单其他项分开提交。

接下来讲一下如何将图片单独上传到服务的实现步骤：

具体代码在以下项目里

github:

https://github.com/guyan0319/...

码云（国内）:

https://gitee.com/jason0319/g...

示例一、解决如下图所示的上传和删除

1、新建文件

vue-element-admin\src\utils\global.js

内容如下

const httphost = 'http://localhost:8090'export { httphost }

这个是服务端的地址，可以根据需要自己调整。

2、修改上传组件代码在SingleImage3.vue

上传图片

引入上面定义的服务器地址

import { httphost } from '@/utils/global'

data()增加uploadUrl

data() {    return {      tempUrl: '',      uploadUrl: httphost + '/upload/image',      dataObj: { token: '', key: '' }    }  },

将

action=``"https://httpbin.org/post"

修改为

 :action="uploadUrl"

图片上传成功on-success绑定的handleImageSuccess函数增加了res，即服务端返回上传结果。

修改代码如下

handleImageSuccess(res, file) {      if (res.code !== 20000){        this.$message({          message: '上传失败',          type: 'error',          showClose: true        })        return false      }      this.emitInput(res.data)    },

服务端返回的json格式为

{    "code":20000,    "data":"http://localhost:8090/showimage?imgname=upload/20200620/tX5vS810l2Fl0K02I0YJLEjLEw9OH7hc.jpg"}

这里需要注意el-upload增加

:with-credentials='true'

支持发送 cookie 凭证信息，上传文件到服务器端需要判断验证登录。

删除图片

通过以上修改实现上传图片，接下处理上传文件删除

文件api/article.js 增加

export function delImage(url) {  return request({    url: '',    method: 'get',    params: { url },    baseURL: httphost + '/del/image'  })}

修改SingleImage3.vue

//引入delImageimport { delImage } from '@/api/article'

  rmImage() {      delImage(this.value).then(response => {        if (response.code === 20000){          this.emitInput('')          return        }        this.$message({          message: '删除失败',          type: 'error',          showClose: true        })      }).catch(err => {        console.log(err)      })    },

服务端删除文件返回json

{"code":20000,"data":"success"}

最后贴一下SingleImage3.vue修改后完整的代码

<template>  <div class="upload-container">    <el-upload      :data="dataObj"      :multiple="false"      :show-file-list="false"      :with-credentials='true'      :on-success="handleImageSuccess"      class="image-uploader"      drag      :action="uploadUrl"    >      <i class="el-icon-upload" />      <div class="el-upload__text">        将文件拖到此处，或<em>点击上传</em>      </div>    </el-upload>    <div class="image-preview image-app-preview">      <div v-show="imageUrl.length>1" class="image-preview-wrapper">        <img :src="imageUrl">        <div class="image-preview-action">          <i class="el-icon-delete" @click="rmImage" />        </div>      </div>    </div>    <div class="image-preview">      <div v-show="imageUrl.length>1" class="image-preview-wrapper">        <img :src="imageUrl">        <div class="image-preview-action">          <i class="el-icon-delete" @click="rmImage" />        </div>      </div>    </div>  </div></template><script>import { getToken } from '@/api/qiniu'import { delImage } from '@/api/article'import { httphost } from '@/utils/global'// import { Cookies } from 'js-cookie'export default {  name: 'SingleImageUpload3',  props: {    value: {      type: String,      default: ''    }  },  data() {    return {      tempUrl: '',      uploadUrl: httphost + '/upload/image',      dataObj: { token: '', key: '' }    }  },  computed: {    imageUrl() {      return this.value    }  },  methods: {    rmImage() {      delImage(this.value).then(response => {        if (response.code === 20000){          this.emitInput('')          return        }        this.$message({          message: '删除失败',          type: 'error',          showClose: true        })      }).catch(err => {        console.log(err)      })    },    emitInput(val) {      this.$emit('input', val)    },    handleImageSuccess(res, file) {      if (res.code !== 20000){        this.$message({          message: '上传失败',          type: 'error',          showClose: true        })        return false      }      this.emitInput(res.data)    },    beforeUpload() {      const _self = this      return new Promise((resolve, reject) => {        getToken().then(response => {          const key = response.data.qiniu_key          const token = response.data.qiniu_token          _self._data.dataObj.token = token          _self._data.dataObj.key = key          this.tempUrl = response.data.qiniu_url          resolve(true)        }).catch(err => {          console.log(err)          reject(false)        })      })    }  }}</script><style lang="scss" scoped>@import "~@/styles/mixin.scss";.upload-container {  width: 100%;  position: relative;  @include clearfix;  .image-uploader {    width: 35%;    float: left;  }  .image-preview {    width: 200px;    height: 200px;    position: relative;    border: 1px dashed #d9d9d9;    float: left;    margin-left: 50px;    .image-preview-wrapper {      position: relative;      width: 100%;      height: 100%;      img {        width: 100%;        height: 100%;      }    }    .image-preview-action {      position: absolute;      width: 100%;      height: 100%;      left: 0;      top: 0;      cursor: default;      text-align: center;      color: #fff;      opacity: 0;      font-size: 20px;      background-color: rgba(0, 0, 0, .5);      transition: opacity .3s;      cursor: pointer;      text-align: center;      line-height: 200px;      .el-icon-delete {        font-size: 36px;      }    }    &:hover {      .image-preview-action {        opacity: 1;      }    }  }  .image-app-preview {    width: 320px;    height: 180px;    position: relative;    border: 1px dashed #d9d9d9;    float: left;    margin-left: 50px;    .app-fake-conver {      height: 44px;      position: absolute;      width: 100%; // background: rgba(0, 0, 0, .1);      text-align: center;      line-height: 64px;      color: #fff;    }  }}</style>

示例二、解决如下图所示的上传

需要修改vue-element-adminsrccomponentsTinymcecomponentsEditorImage.vue文件，处理方式和示例一差不多，这里只贴代码

<template>  <div class="upload-container">    <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" @click=" dialogVisible=true">      upload    </el-button>    <el-dialog :visible.sync="dialogVisible">      <el-upload        :multiple="true"        :file-list="fileList"        :show-file-list="true"        :with-credentials='true'        :on-remove="handleRemove"        :on-success="handleSuccess"        :before-upload="beforeUpload"        class="editor-slide-upload"        :action="uploadUrl"        list-type="picture-card"      >        <el-button size="small" type="primary">          Click upload        </el-button>      </el-upload>      <el-button @click="dialogVisible = false">        Cancel      </el-button>      <el-button type="primary" @click="handleSubmit">        Confirm      </el-button>    </el-dialog>  </div></template><script>// import { getToken } from 'api/qiniu'import { delImage } from '@/api/article'import { httphost } from '@/utils/global'export default {  name: 'EditorSlideUpload',  props: {    color: {      type: String,      default: '#1890ff'    }  },  data() {    return {      dialogVisible: false,      uploadUrl: httphost + '/upload/image',      listObj: {},      fileList: []    }  },  methods: {    checkAllSuccess() {      return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess)    },    handleSubmit() {      const arr = Object.keys(this.listObj).map(v => this.listObj[v])      if (!this.checkAllSuccess()) {        this.$message('Please wait for all images to be uploaded successfully. If there is a network problem, please refresh the page and upload again!')        return      }      this.$emit('successCBK', arr)      this.listObj = {}      this.fileList = []      this.dialogVisible = false    },    handleSuccess(response, file) {      const uid = file.uid      const objKeyArr = Object.keys(this.listObj)      for (let i = 0, len = objKeyArr.length; i < len; i++) {        if (this.listObj[objKeyArr[i]].uid === uid) {          this.listObj[objKeyArr[i]].url = response.data          // this.listObj[objKeyArr[i]].url = response.files.file          this.listObj[objKeyArr[i]].hasSuccess = true          return        }      }    },    handleRemove(file) {      const uid = file.uid      const objKeyArr = Object.keys(this.listObj)      for (let i = 0, len = objKeyArr.length; i < len; i++) {        if (this.listObj[objKeyArr[i]].uid === uid) {          delImage(this.listObj[objKeyArr[i]].url).then(response => {            if (response.code !== 20000) {              this.$message('删除失败')              return            }            delete this.listObj[objKeyArr[i]]          }).catch(err => {            console.log(err)          })          return        }      }    },    beforeUpload(file) {      const _self = this      const _URL = window.URL || window.webkitURL      const fileName = file.uid      this.listObj[fileName] = {}      return new Promise((resolve, reject) => {        const img = new Image()        img.src = _URL.createObjectURL(file)        img.onload = function() {          _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height }        }        resolve(true)      })    }  }}</script><style lang="scss" scoped>.editor-slide-upload {  margin-bottom: 20px;  /deep/ .el-upload--picture-card {    width: 100%;  }}</style>

至此，vue-element-admin 单独上传图片实现方式就讲完了，如有任何问题或建议欢迎提issues，

前言