[JavaScript知识库]vue 封装文件上传/下载请求方法

效果图：

xxx.vue

      <el-descriptions class="margin-top" title="" :column="1" :size="serverPackageFormSize" border>
        <template slot="extra">
            <el-upload
              ref="uploader"
              class="upload-demo"
              action=""
              :limit="1"
              :show-file-list="false"
              :disabled="upload_loading"
              :http-request="replacePackage"
              :on-exceed="handleExceed"
              :file-list="fileList">
              <el-button type="success" v-hasPermi="['printServer:package:upload']" :loading="upload_loading" size="small" >上传</el

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