js实现csv下载

var TableDatas  = '数据源';
function getCSV(){
    if(this.TableDatas.length === 0){
        alert("没有数据呀呀呀呀！");
        return false;
    }
    const jsonData = {
        target: {
          header: ['是否有效', '区分', 'URL', '担当', '日期', '説明'],
          filter: ['url_flag', 'division', 'url_value', 'opt_user_nm', 'opt_datetime', 'url_note'],
          list: this.TableDatas
        }
    };
    this.exportMethod(jsonData);
}

function exportMethod(data) {
    const csvTitle = data.target.header;
    const csvFilter = data.target.filter;
    const csvList = data.target.list;
    const csvData = [];
    csvData.push('"' + csvTitle.join('","') + '"\n');
    for (let i = 0; i < csvList.length; i++) {
        const tmp = [];
　　　　　for (let j = 0; j < csvFilter.length; j++) {
        　　var d = csvList[i][csvFilter[j]];
        　　tmp.push(d);
    　　}
    　　csvData.push('"' + tmp.join('","') + '"\n');
     }
     // csv download
     const uri = 'data:text/csv;charset=utf-8,\ufeff' + encodeURIComponent(csvData.join(''));
     const link = document.createElement('a');
     link.href = uri;
     link.download = `text.csv`;
     document.body.appendChild(link);
     link.click();
}