npm i element-ui -S

<el-upload
  class="upload-demo"
  drag
  action="https://jsonplaceholder.typicode.com/posts/"
  multiple>
  <i class="el-icon-upload"></i>
  <div class="el-upload__text">將文件拖到此處，或<em>點(diǎn)擊上傳</em></div>
  <div class="el-upload__tip" slot="tip">只能上傳jpg/png文件，且不超過(guò)500kb</div>
</el-upload>

import Vue from 'vue'
import App from './App.vue'
import './registerServiceWorker'
import router from './router'
import store from './store'
// 引入element ui
import ElementUI from 'element-ui';
import 'element-ui/lib/theme-chalk/index.css';
Vue.config.productionTip = false
Vue.use(ElementUI);
new Vue({
  el: '#app',
  router,
  store,
  render: h => h(App)
})

<template>
  <div>
    <el-upload class="upload-demo" drag action="https://jsonplaceholder.typicode.com/posts/" multiple>
      <i class="el-icon-upload"></i>
      <div class="el-upload__text">將文件拖到此處，或<em>點(diǎn)擊上傳</em></div>
      <div class="el-upload__tip" slot="tip">只能上傳jpg/png文件，且不超過(guò)500kb</div>
    </el-upload>
  </div>
</template>
<script>
export default {
  data() {
    return {
    }
  }
}
</script>
<style scoped></style>

<template>
  <div id="app">
    <uploadView/>
  </div>
</template>
<script>
// 引入創(chuàng)建的upload.vue組件
import uploadView from './views/upload.vue'
export default{
  components:{
    uploadView
  }
}
</script>
<style scope>
</style>

<template>
  <div>
    <!-- 圖片上傳 -->
    <el-upload class="avatar-uploader" action="https://jsonplaceholder.typicode.com/posts/" :show-file-list="false"
      :on-success="handleAvatarSuccess" :before-upload="beforeAvatarUpload">
      <img v-if="imageUrl" :src="imageUrl" class="avatar">
      <i v-else class="el-icon-plus avatar-uploader-icon"></i>
    </el-upload>
  </div>
</template>
<script>
export default {
  data() {
    return {
      imageUrl: ''
      // 接受我們上傳圖片的地址，上傳成功以后給的地址
    };
  },
  methods: {
    // 上傳成功的回調(diào)
    handleAvatarSuccess(res, file) {
      //demo 轉(zhuǎn)換成url，后期可以換成后端給我們返回的地址
      this.imageUrl = URL.createObjectURL(file.raw);
      // 轉(zhuǎn)化可以顯示頁(yè)面的地址，其實(shí)正常開發(fā)中已經(jīng)可以拿到后端返回的地址，可以直接使用的
    },
    // 上傳之前的回調(diào)
    beforeAvatarUpload(file) {
      // isJPG圖片格式是否符合我們的規(guī)定
      const isJPG = file.type === 'image/jpeg';
      // isLt2M 文件大小是否符合我們的規(guī)定
      const isLt2M = file.size / 1024 / 1024 < 2; 
      if (!isJPG) {
        this.$message.error('上傳頭像圖片只能是 JPG 格式!');
      }
      if (!isLt2M) {
        this.$message.error('上傳頭像圖片大小不能超過(guò) 2MB!');
      }
      return isJPG && isLt2M;
    }
  }
}
</script>
<style scoped>
/* 圖片上傳樣式 */
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.avatar-uploader .el-upload:hover {
  border-color: #409EFF;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 178px;
  height: 178px;
  line-height: 178px;
  text-align: center;
}
.avatar {
  width: 178px;
  height: 178px;
  display: block;
}
</style>

<template>
  <div id="app">
    <!-- 文件上傳 -->
    <!-- <uploadView/> -->
    <!-- 圖片上傳 -->
    <imgUpload/>
  </div>
</template>
<script>
// 引入創(chuàng)建的upload.vue組件
// 文件上傳
import uploadView from './views/upload.vue'
// 圖片上傳
import imgUpload from './views/imgUpload.vue'
export default{
  components:{
    uploadView,
    imgUpload
  }
}
</script>
<style>
</style>

handlepreview (file)

 handleremove (file,filelist)

  globObj.$axios({
    url: url,
    method: 'post',
    transformRequest: [function(data, headers) {
      // 去除post請(qǐng)求默認(rèn)的Content-Type
      delete headers['Content-Type']
      return data
    }],
    data: formData,
    timeout: 300000
  }).then(res => {
    ElMessage.success('資產(chǎn)添加成功');
  }).catch((err) => {
    console.log(err);
  });

const formData = new FormData();
formData.append('file', file);
// 其他參數(shù)
formData.append('mailSys', mailSys);