<el-icon @click="chooseBackgroundImg" size="15px" style="color: #409eff;">
   <Edit />
 </el-icon>

  <el-upload v-show="false" with-credentials :action="uploadUrl" show-file-list="false" :on-success="onSuccessUpload"
        :before-upload="beforeUpload" ref="uploadBackgroundImg">

    </el-upload>


import { ref, reactive, type Ref } from 'vue';
const uploadBackgroundImg: Ref<UploadInstance> = ref(null);
function chooseBackgroundImg() {
    uploadBackgroundImg.value.$el.querySelector('input').click();
}