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vue 把后台返回的json拼接成excel并下载

前言

其实这个需求不是很常见，一般是后端接口直接返回流文件，前端调接口下载就行，如果不是有某些特殊需求一定要前端处理，还是建议后端处理下😁

先封装一下生成excel的方法

downfile.js

export default {
  data() {
    return {}
  },
  components: {},
  created() {
  },
  methods: {
    downloadFiles(data,type){
      this.JSONToExcelConvertor(data.content, type+"报表", data.title);
    },

    JSONToExcelConvertor(JSONData, FileName, ShowLabel) {
      //先转化json
      const arrData = typeof JSONData != 'object' ? JSON.parse(JSONData) : JSONData;

      let excel = '<table>';

      //设置表头
      let row = "<tr>";
      for (let i = 0, l = ShowLabel.length; i < l; i++) {
        row += "<td>" + ShowLabel[i] + '</td>';
      }
      //换行
      excel += row + "</tr>";
      //设置数据
      for (let i = 0; i < arrData.length; i++) {
        let row = "<tr>";

        for (let index in arrData[i]) {
          const value = arrData[i][index] === "." ? "" : arrData[i][index];
          row += '<td>' + value + '</td>';
        }

        excel += row + "</tr>";
      }

      excel += "</table>";

      let excelFile = "<html xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:x='urn:schemas-microsoft-com:office:excel' xmlns='http://www.w3.org/TR/REC-html40'>";
      excelFile += '<meta http-equiv="content-type" content="application/vnd.ms-excel; charset=UTF-8">';
      excelFile += '<meta http-equiv="content-type" content="application/vnd.ms-excel';
      excelFile += '; charset=UTF-8">';
      excelFile += "<head>";
      excelFile += "<!--[if gte mso 9]>";
      excelFile += "<xml>";
      excelFile += "<x:ExcelWorkbook>";
      excelFile += "<x:ExcelWorksheets>";
      excelFile += "<x:ExcelWorksheet>";
      excelFile += "<x:Name>";
      excelFile += "{worksheet}";
      excelFile += "</x:Name>";
      excelFile += "<x:WorksheetOptions>";
      excelFile += "<x:DisplayGridlines/>";
      excelFile += "</x:WorksheetOptions>";
      excelFile += "</x:ExcelWorksheet>";
      excelFile += "</x:ExcelWorksheets>";
      excelFile += "</x:ExcelWorkbook>";
      excelFile += "</xml>";
      excelFile += "<![endif]-->";
      excelFile += "</head>";
      excelFile += "<body>";
      excelFile += excel;
      excelFile += "</body>";
      excelFile += "</html>";


      const uri = 'data:application/vnd.ms-excel;charset=utf-8,' + encodeURIComponent(excelFile);

      const link = document.createElement("a");
      link.href = uri;

      link.style = "visibility:hidden";
      link.download = FileName + ".xls";

      document.body.appendChild(link);
      link.click();
      document.body.removeChild(link);
    }

  }
}

然后在页面中调用

<template>
    <div>
        <button @click="_sendDownloadFilesServer()">下载报表</button>
    </div>
</template>

<script>
import RecordServer from "@/service/record.service"
const recordServer = new RecordServer()
import downloadFileMixin from "@/mixins/downfile" //把上面的文件导入
export default{
    data(){
        return{

        }
    },
    mixins:[downloadFileMixin],
    methods:{
        _sendDownloadFilesServer(){
           recordServer.sendDownloadFilesServer({
             onSuccess:(res)=>{
                console.log(res)
                this.downloadFiles(res,'火车') // 点击下载文件会下载名为火车报表的excel
             },
             onFailed:(err)=>{
                console.log(err)
             }
           })
        }
    }
}
</script>