download-csv.js

function escape(col) {
    return '"' + col.replace(/"/g, '""') + '"';
}

const utf8BOM = '\ufeff';

const csvData = `姓名,年龄
小 明,10
小红, 10
小李 ,8
${escape('Le,Ming')}, 13`;

const blob = new Blob([utf8BOM, csvData], { type: 'text/csv,charset=UTF-8' });
const url = URL.createObjectURL(blob);

const link = document.createElement('a');
link.download = '学生.csv';
link.href = url;
link.click();

URL.revokeObjectURL(url);