vue实现excel导入

<el-dialog :title="upload.title" :visible.sync="upload.open1"
 :close-on-click-modal = "false"
 :show-close="false" width="400px" append-to-body>
 <el-upload
 accept=".xlsx, .xls"
 action=""
 :show-file-list="true"
 :file-list="fileList"
 :on-change="getFile"
 :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" slot="tip">
 <el-link type="info" style="font-size:12px;color: #f70000;" @click="downloadTemplate">下载模板</el-link>
 </div>
 <div class="el-upload__tip" style="color:red" slot="tip">提示：仅允许导入“xls”或“xlsx”格式文件！</div>
 </el-upload>
 <div slot="footer" class="dialog-footer">
 <el-button type="primary" @click="importAll">导 入</el-button>
 <el-button @click="cancelUpload">取 消</el-button>
 </div>
 </el-dialog>

if (fileList.length > 0) {
 this.fileList = [fileList[fileList.length - 1]] // 这一步，是 展示最后一次选择的文件
 }

async getFile(item, fileList){
 this.arr = [];
 if (fileList.length > 0) {
 this.fileList = [fileList[fileList.length - 1]] // 这一步，是 展示最后一次选择的文件
 }
 let file = item.raw
 if (!file) return
 let reader = await upload(file)
 const worker = xlsx.read(reader, { type: 'binary' })
 // 将返回的数据转换为json对象的数据
 reader = xlsx.utils.sheet_to_json( worker.Sheets[worker.SheetNames[0]])
 // 注意这里的表头一定要和excel表头一致，不然就会报错，建议粘贴复制过来
 reader.map(v => {
 const obj = {}
 obj.name = v['工序名']
 obj.standardtime = v['标准时间(秒:s)']
 obj.price = v['单价(元)']
 obj.note = v['备注']
 this.arr.push(obj)
 })
 },

return new Promise(resolve=>{
 let reader = new FileReader()
 reader.readAsBinaryString(file);
 reader.onload = ev=>{
 resolve(ev.target.result)
 }
 })
}