一、vue3写法

1、html部分

<el-button
                     type="info"
                     plain
                     icon="Upload"
                     @click="handleImport"
                     v-hasPermi="['system:user:import']"
                  >导入</el-button>

 <!-- 导入对话框 -->
      <el-dialog :title="upload.title" v-model="upload.open" width="400px" append-to-body>
         <el-upload
            ref="uploadRef"
            :limit="1"
            accept=".xlsx, .xls"
            :headers="upload.headers"
            :action="upload.url + '?updateSupport=' + upload.updateSupport"
            :disabled="upload.isUploading"
            :on-progress="handleFileUploadProgress"
            :on-success="handleFileSuccess"
            :auto-upload="false"
            drag
         >
            <el-icon class="el-icon--upload"><upload-filled /></el-icon>
            <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
            <template #tip>
               <div class="el-upload__tip text-center">
                  <div class="el-upload__tip">
                     <el-checkbox v-model="upload.updateSupport" />是否更新已经存在的数据
                  </div>
                  <span>仅允许导入xls、xlsx格式文件。</span>
                  <el-link type="primary" :underline="false" style="font-size:12px;vertical-align: baseline;" @click="importTemplate">下载模板</el-link>
               </div>
            </template>
         </el-upload>
         <template #footer>
            <div class="dialog-footer">
               <el-button type="primary" @click="submitFileForm">确 定</el-button>
               <el-button @click="upload.open = false">取 消</el-button>
            </div>
         </template>
      </el-dialog>

2、js部分

/*** 导入参数 */
const upload = reactive({
  // 是否显示弹出层（用户导入）
  open: false,
  // 弹出层标题（用户导入）
  title: "",
  // 是否禁用上传
  isUploading: false,
  // 是否更新已经存在的用户数据
  updateSupport: 0,
  // 设置上传的请求头部
  headers: { Authorization: "Bearer " + getToken() },
  // 上传的地址
  url: import.meta.env.VITE_APP_BASE_API + "/system/user/importData"
});

/** 导入按钮操作 */
function handleImport() {
  upload.title = "用户导入";
  upload.open = true;
};

/** 下载模板操作 */
function importTemplate() {
  proxy.download("system/user/importTemplate", {
  }, `user_template_${new Date().getTime()}.xlsx`);
};
/**文件上传中处理 */
const handleFileUploadProgress = (event, file, fileList) => {
  upload.isUploading = true;
};
/** 文件上传成功处理 */
const handleFileSuccess = (response, file, fileList) => {
  upload.open = false;
  upload.isUploading = false;
  proxy.$refs["uploadRef"].handleRemove(file);
  proxy.$alert("<div style='overflow: auto;overflow-x: hidden;max-height: 70vh;padding: 10px 20px 0;'>" + response.msg + "</div>", "导入结果", { dangerouslyUseHTMLString: true });
  getList();
};
/** 提交上传文件 */
function submitFileForm() {
  proxy.$refs["uploadRef"].submit();
};

二、vue2写法

1、html部分

  <el-button
                     type="info"
                     plain
                     icon="Upload"
                     @click="handleImport"
                     v-hasPermi="['system:user:import']"
                  >导入</el-button>
    <!-- 导入对话框 -->
<el-dialog
      :title="upload.title"
      :visible.sync="upload.open"
      width="400px"
      append-to-body
    >
      <el-upload
        ref="upload"
        :limit="1"
        accept=".xlsx, .xls"
        :headers="upload.headers"
        :action="upload.url + '?updateSupport=' + upload.updateSupport"
        :disabled="upload.isUploading"
        :on-progress="handleFileUploadProgress"
        :on-success="handleFileSuccess"
        :auto-upload="false"
        drag
      >
        <i class="el-icon-upload"></i>
        <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
        <div class="el-upload__tip text-center" slot="tip">
          <div class="el-upload__tip" slot="tip">
            <el-checkbox v-model="upload.updateSupport" />
            是否更新已经存在的数据
          </div>
          <span>仅允许导入xls、xlsx格式文件。</span>
          <el-link
            type="primary"
            :underline="false"
            style="font-size: 12px; vertical-align: baseline"
            @click="importTemplate"
            >下载模板</el-link
          >
        </div>
      </el-upload>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitFileForm">确 定</el-button>
        <el-button @click="upload.open = false">取 消</el-button>
      </div>
    </el-dialog>

2、js部分

 data() {
    return {
   
      // 用户导入参数
      upload: {
        // 是否显示弹出层（用户导入）
        open: false,
        // 弹出层标题（用户导入）
        title: "",
        // 是否禁用上传
        isUploading: false,
        // 是否更新已经存在的用户数据
        updateSupport: 0,
        // 设置上传的请求头部
        headers: { Authorization: "Bearer " + getToken() },
        // 上传的地址
        url: process.env.VUE_APP_BASE_API + "/system/user/importData",
      },
    };
  },
 /** 导入按钮操作 */
    handleImport() {
      this.upload.title = "用户导入";
      this.upload.open = true;
    },
    /** 下载模板操作 */
    importTemplate() {
      this.download(
        "system/user/importTemplate",
        {},
        `user_template_${new Date().getTime()}.xlsx`
      );
    },
    // 文件上传中处理
    handleFileUploadProgress(event, file, fileList) {
      this.upload.isUploading = true;
    },
    // 文件上传成功处理
    handleFileSuccess(response, file, fileList) {
      this.upload.open = false;
      this.upload.isUploading = false;
      this.$refs.upload.clearFiles();
      this.$alert(
        "<div style='overflow: auto;overflow-x: hidden;max-height: 70vh;padding: 10px 20px 0;'>" +
          response.msg +
          "</div>",
        "导入结果",
        { dangerouslyUseHTMLString: true }
      );
      this.getList();
    },
    // 提交上传文件
    submitFileForm() {
      this.$refs.upload.submit();
    },

三、展示效果