如何不借助插件前端自己写导出excel --csv格式

exportCsv(title, data, fileName){

        let today = new Date();

        let tadayDate = today.getFullYear() + "-" +(today.getMonth() + 1) + "-" + today.getDate();

        fileName = "学校报名列表-" + tadayDate;

        var CSV = '';

        var row = "";

 

        let temp = []

        data=this.appTable

 

        title=[

        {title:'名字1',field:'account_name'},

        {title:'名字2',field:'student_name'},

        {title:'名字3',field:'application_project'},

        {title:'子名字4',field:'application_events'},

        {title:'名字',field:'application_channel'},

        ]

        

        for (var i = 0; i < title.length; i++) {

          if(title[i].title){

            row += title[i].title + ',';

          }

        }

        row = row.slice(0, -1);

        CSV += row + '\r\n';

        

        for (var i = 0; i < data.length; i++) {

          var row = "";

          for (var j = 0; j < title.length; j++) {

          if(title[j].title){        

             row += '"' + data[i][title[j].field] +'"\t,';

          }

          }

          row.slice(0, row.length - 1);

          CSV += row + '\r\n';

        }

        

        if (CSV == '') {

          alert("Invalid data");

          return;

        }

        

        var fileName = fileName;

        var uri = new Blob(['\ufeff' + CSV], {type:"text/csv"});

        

        if (window.navigator && window.navigator.msSaveOrOpenBlob) { // for IE

          window.navigator.msSaveOrOpenBlob(CSV, fileName + ".csv");

        } else { // for Non-IE（chrome、firefox etc.）

          var link = document.createElement("a");

          link.href = URL.createObjectURL(uri);

        

          link.style = "visibility:hidden";

          link.download = fileName + ".csv";

          document.body.appendChild(link);

          link.click();

          document.body.removeChild(link);

        }

        },