perf[uploadExcel]: add beforeUpload hock

src/views/excel/uploadExcel.vue

@@ -1,6 +1,6 @@
 <template>
   <div class="app-container">
-    <upload-excel-component @success='handleSuccess'></upload-excel-component>
+    <upload-excel-component :on-success='handleSuccess' :before-upload="beforeUpload"></upload-excel-component>
     <el-table :data="tableData" border highlight-current-row style="width: 100%;margin-top:20px;">
       <el-table-column v-for='item of tableHeader' :prop="item" :label="item" :key='item'>
       </el-table-column>
@@ -21,6 +21,18 @@ export default {
     }
   },
   methods: {
+    beforeUpload(file) {
+      const isLt2M = file.size / 1024 / 1024 < 1
+
+      if (isLt2M) {
+        return true
+      }
+      this.$message({
+        message: 'Please do not upload files larger than 2m in size.',
+        type: 'warning'
+      })
+      return false
+    },
     handleSuccess({ results, header }) {
       this.tableData = results
       this.tableHeader = header