新增 Excel 上传组件 xlsx 更新到 ^0.14.1 (#100)

* xlsx 更新版本到^0.14.1

* 新增 Excel 上传组件 及上传示例

src/views/components/excel/upload-excel.vue

@@ -0,0 +1,41 @@
+<template>
+  <div class="app-container">
+    <upload-excel-component :on-success="handleSuccess" :before-upload="beforeUpload" />
+    <el-table :data="tableData" border highlight-current-row style="width: 100%;margin-top:20px;">
+      <el-table-column v-for="item of tableHeader" :key="item" :prop="item" :label="item" />
+    </el-table>
+  </div>
+</template>
+
+<script>
+import UploadExcelComponent from '@/components/UploadExcel/index.vue'
+
+export default {
+  name: 'UploadExcel',
+  components: { UploadExcelComponent },
+  data() {
+    return {
+      tableData: [],
+      tableHeader: []
+    }
+  },
+  methods: {
+    beforeUpload(file) {
+      const isLt1M = file.size / 1024 / 1024 < 1
+      if (isLt1M) {
+        return true
+      }
+
+      this.$message({
+        message: '请不要上传大于1m的文件.',
+        type: 'warning'
+      })
+      return false
+    },
+    handleSuccess({ results, header }) {
+      this.tableData = results
+      this.tableHeader = header
+    }
+  }
+}
+</script>