vue--excel上传

在vue中实现excel上传并显示数据
效果如下：

具体代码如下：

<template>
  <div class="app-container">
      <input
        ref="excel-upload-input"
        class="excel-upload-input"
        style="width: 300px;margin-left: 10px"
        type="file"
        accept=".xlsx, .xls"
        @change="handleClick"
      />
      <div class="drop" @drop="handleDrop" @dragover="handleDragover" @dragenter="handleDragover">
        批量导入：拖拽excel文件或者
        <el-button :loading="loading" style="margin-left:16px;" size="mini" type="primary" @click="handleUpload">
          浏览
        </el-button>
      </div>
    <el-table :data="excelData.results" border highlight-current-row style="width: 100%;margin-top:20px;">
      <el-table-column v-for="item of excelData.header" :key="item" :prop="item" :label="item"/>
    </el-table>
  </div>
</template>

<script>
import XLSX from 'xlsx'
export default {
  name: 'UploadExcel',
  data() {
    return {
      loading: false,
      excelData: {
        header: null,
        results: null
      }
    }
  },
  methods: {
    handleUpload() {
      this.$refs['excel-upload-input'].click()
    },
    handleClick(e) {
      const files = e.target.files
      const file = files[0]
      const before = this.beforeUpload(file)
      if (before) {
        this.upload(file)
      }
    },
    // 上传文件的条件验证
    beforeUpload(file) {
      if (!file) {
        return false
      }
      const isLt1M = file.size / 1024 / 1024 < 1
      if (isLt1M) {
        return true
      }
      this.$message({
        message: '请上传1M以内的文件',
        type: 'warning'
      })
      return false
    },
    // excel文件数据获取
    upload(file) {
      this.$refs['excel-upload-input'].value = null
      return new Promise((resolve, reject) => {
        const reader = new FileReader()
        reader.onload = e => {
          const data = e.target.result
          const workbook = XLSX.read(data, { type: 'array' })
          // 获取第一个sheet页名字
          const firstSheetName = workbook.SheetNames[0]
          // 获取指定名字的sheet页内容
          const worksheet = workbook.Sheets[firstSheetName]
          // 获取标头
          const header = this.getHeaderRow(worksheet)
          // 获取除标头外的数据
          const results = XLSX.utils.sheet_to_json(worksheet)
          // 标头和数据处理
          this.generateData({ header, results })
          resolve()
        }
        reader.readAsArrayBuffer(file)
      })
    },
    // 获取标头
    getHeaderRow(sheet) {
      const headers = []
      const range = XLSX.utils.decode_range(sheet['!ref'])
      let C
      const R = range.s.r
      /* start in the first row */
      for (C = range.s.c; C <= range.e.c; ++C) { /* walk every column in the range */
        const cell = sheet[XLSX.utils.encode_cell({ c: C, r: R })]
        /* find the cell in the first row */
        let hdr = 'UNKNOWN ' + C // <-- replace with your desired default
        if (cell && cell.t) hdr = XLSX.utils.format_cell(cell)
        headers.push(hdr)
      }
      return headers
    },
    handleDrop(e) {
      e.stopPropagation()
      e.preventDefault()
      if (this.loading) return
      const files = e.dataTransfer.files
      if (files.length !== 1) {
        this.$message.error('仅支持上传一个文件!')
        return
      }
      const rawFile = files[0] // only use files[0]

      if (!this.isExcel(rawFile)) {
        this.$message.error('仅支持上传.xlsx, .xls, .csv格式的文件')
        return false
      }
      this.upload(rawFile)
      e.stopPropagation()
      e.preventDefault()
    },
    handleDragover(e) {
      e.stopPropagation()
      e.preventDefault()
      e.dataTransfer.dropEffect = 'copy'
    },
    // 标头和数据处理（可以在此方法中调用后端接口保存数据）
    generateData({ header, results }) {
      this.excelData.header = header
      this.excelData.results = results
    }
  }
}
</script>

<style scoped>
.excel-upload-input {
  display: none;
  z-index: -9999;
}

.drop {
  border: 2px dashed #bbb;
  width: 600px;
  height: 160px;
  line-height: 160px;
  margin: 0 auto;
  font-size: 24px;
  border-radius: 5px;
  text-align: center;
  color: #bbb;
  position: relative;
}
</style>