vue用法父组件调用子组件方法--->$refs

vue下载excel模板（放入弹框独立出来）后再导入表格
子组件

<el-dialog title="导入" :visible.sync="dialogVisible" :modal-append-to-body="false">
<el-upload
class="upload-demo"
ref="upload"
:action="action"
:on-preview="handlePreview"
:on-remove="handleRemove"
:file-list="fileList"
:limit="1"
:headers="headers"
name="upfile"
accept=".csv "
:on-error="uploadFileErro"
:on-success="uploadFileSuccess"
:auto-upload="false">
选取文件
<el-button style="margin-left: 10px;" size="small" type="success" @click="downloadModel" class="em-btn-border">
下载模板

只能上传csv文件

<el-button @click="dialogVisible = false" class="em-button">取 消
<el-button type="primary" @click="submitUpload" class="em-button">确 定

父组件：
<el-button
size="mini"
type="primary"
icon="el-icon-delete"
@click="handleExcel"
>csv导入